I recently discovered The Excel Function Bible:
http://www.rondebruin.nl/efb/efb.htm

This site has explanations about all 468 Excel Functions, check it out… This is a copy/paste from their downloadable spreadsheet:

ABS Returns the absolute value of a number
ACCRINT Returns the accrued interest for a security that pays periodic interest
ACCRINTM Returns the accrued interest for a security that pays interest at maturity
ACOS Returns the arccosine, or inverse trigonometric function of cosine of a number. The arccosine is the angle whose cosine is number.
ACOSH Returns the inverse hyperbolic cosine of a number. The inverse hyperbolic cosine is the value whose hyperbolic cosine is number.
ACOT Returns the principal value in radians of the arccotangent, or inverse cotangent, of a number.
ACOTH Returns the inverse hyperbolic cotangent of a number.
ADDRESS Creates a cell address as text based on given row and column rumbers
AGGREGATE Returns an aggregate in a list or database. The AGGREGATE function can apply different aggregate functions to a list or database with the option to ignore hidden rows and error values.
AMORDEGRC Returns the depreciation for each accounting period using the French accounting system. If an asset is purchased in the middle of the accounting period, the prorated depreciation is taken into account. The function is similar to AMORLINC, except that a depreciation coefficient is applied in the calculation depending on the life of the assets.
Do not use this function. The data used for the coefficient algorithm in the calculation used is out of date. See EFB Help & Examples for this function.
AMORLINC Returns the depreciation for each accounting period using the French accounting system. This function is provided for the French accounting system.Pro-rating of depreciation is used for assets purchased in the middle of an accounting period.
AND Returns TRUE if all its arguments are TRUE
Excel 2007 onwards allow 255 Logical Conditions.
Excel 2003 and before limit was 30.
ARABIC Converts a Roman numeral to an Arabic numeral.
AREAS Returns the number of areas in reference.
Claimed volatile but apparently not.
ASC Changes full-width (double-byte) English letters or katakana within a character string to half-width (single-byte) characters
ASIN Returns the arcsine, or inverse sine, of a number. The returned angle is given in radians in the range -pi/2 to pi/2.
ASINH Returns the inverse hyperbolic sine of a number. The inverse hyperbolic sine is the value whose hyperbolic sine is number. Excel 2010 Improved accuracy.
ATAN Returns in radians the arctangent of a number
ATAN2 Returns the arctangent, or inverse tangent, of the specified x- and y-coordinates. The arctangent is the angle from the x-axis to a line containing the origin (0, 0) and a point with coordinates (x_num, y_num). The angle is given in radians between -pi and pi, excluding -pi.
ATANH Returns the inverse hyperbolic tangent of a number
AVEDEV Returns the average of the absolute deviations of data points from their mean for up to 255 numeric arguments. Was 30 before Excel 2007.
AVERAGE Returns the average (arithmetic mean) of up to 255 numeric arguments. Was 30 before Excel 2007.
AVERAGEA Returns the average (arithmetic mean) of up to 255 arguments and includes evaluation of text and logical arguments. Was 30 before Excel 2007.
AVERAGEIF Returns the arithmetic mean of all the cells in a range that meet a given criteria.
AVERAGEIFS Returns the arithmetic mean of all the cells in a range that meet multiple criteria.
BAHTTEXT Converts a number to Thai text and adds a suffix of “Baht”
BASE Converts a number into a text representation with the given radix (base).
BESSELI Returns the Bessel function evaluated for purely imaginary arguments
BESSELJ Returns the Bessel function represented by Jn(x)
BESSELK Returns the modified Bessel function represented by Kn(x)
BESSELY Returns the Bessel / Weber / Neumann function Yn(x)
BETA.DIST Returns either:
a. The cumulative distribution function of the beta distribution, OR
b. The probability density function of the beta distribution.
BETADIST Returns the cumulative beta probability density function
BETA.INV Returns the inverse of the beta cumulative probability density function (BETA.DIST).
BETAINV Returns the inverse of the cumulative beta probability density function
BIN2DEC Converts binary number to decimal
BIN2HEX Converts binary number to hexadecimal
BIN2OCT Converts binary number to octal
BINOM.DIST Returns either:
a. The cumulative distribution function of the binomial distribution, OR
b. The probability density function of the binomial distribution.
BINOMDIST Returns either:
a. The cumulative distribution function of the binomial distribution, OR
b. The probability density function of the binomial distribution.
BINOM.DIST.RANGE Returns the probability of a trial result lying within a user provided range using a binomial distribution.
BINOM.INV Returns the smallest value for which the cumulative binomial distribution is greater than or equal to a criterion value.
BITAND Returns a bitwise ‘AND’ of two numbers.
BITLSHIFT Returns a number shifted left by the specified number of bits.
BITOR Returns a bitwise ‘OR’ of two numbers.
BITRSHIFT Returns a number shifted right by the specified number of bits.
BITXOR Returns a bitwise ‘XOR’ of two numbers.
CALL Calls a procedure in a dynamic link library or code resource. Now disabled due to security risk problems.
CEILING Rounds a number (away from zero) to the nearest multiple of significance. Excel 2010 Improved accuracy.
CEILING.MATH Rounds a number up to the nearest integer or to the nearest multiple of significance.
CEILING.PRECISE Returns a number that is rounded up to the nearest integer or to the nearest multiple of significance. Regardless of the sign of the number, the number is rounded up. However, if the number or the significance is zero, zero is returned.
CELL Returns information about the formatting , location or contents of the cell or upper left cell of the reference. Volatile for some arguments.
CHAR Returns the ANSI character set (Microsoft) or Macintosh character set (Macintosh) specified by the code number
CHIDIST Returns the one-tailed probability of the chi-squared distribution
CHIINV Returns the inverse of the one-tailed probability of the chi-squared distribution
CHISQ.DIST Returns either:
a. The cumulative distribution function of the chi-squared distribution, OR
b. The probability density function of the chi-squared distribution.
CHISQ.DIST.RT Returns the right-tailed probability of the chi-squared distribution.
CHISQ.INV Returns the inverse of the left-tailed probability of the chi-squared distribution.
CHISQ.INV.RT Returns the inverse of the right-tailed probability of the chi-squared distribution.
CHISQ.TEST Returns the test for independence. CHISQ.TEST returns the value from the chi-squared (χ2) distribution for the statistic and the appropriate degrees of freedom.
CHITEST Returns the value from the chi-squared (γ2) distribution for the statistic and the appropriate degrees of freedom
CHOOSE Uses a specified index number to select one from up to 254 specified values.
Was 29 before Excel 2007.
CLEAN Removes all nonprintable characters from text
CODE Returns a numeric code for the first character in a text string
COLUMN Returns the column number of the cell or a specified reference
COLUMNS Returns the number of columns in an array or reference. Claimed volatile but apparently not.
COMBIN Returns the number of combinations for a given number of objects without replacement.
COMBINA Returns the number of combinations (with repetitions) for a given number of items.
COMPLEX Converts real and imaginary coefficients into complex numbers of the form x + yi or x + yj depending upon suffix
CONCATENATE Joins up to 255 text items into one text item.
Raised from 30 as from Excel 2007.
CONFIDENCE Returns the confidence interval for a population mean
CONFIDENCE.NORM Returns the confidence interval for a population mean, using a normal distribution.
CONFIDENCE.T Returns the confidence interval for a population mean, using a Student’s t distribution.
CONVERT Converts a number from one measurement system to another. Excel 2010 Improved accuracy.
CORREL Returns the correlation coefficient between two arrays of data
COS Returns the cosine of a given angle given in radians
COSH Returns the hyperbolic cosine of a number
COT Returns the cotangent of an angle specified in radians.
COTH Returns the hyperbolic cotangent of a hyperbolic angle.
COUNT Counts the number of cells that contain numbers and also numbers within the list of up to 255 arguments.
Was 30 arguments before Excel 2007.
COUNTA Counts the number of non-empty cells and the values within the list of up to 255 arguments.
Was 30 arguments before Excel 2007.
COUNTBLANK Counts the number of blank cells in the range.
COUNTIF Counts the number of cells that meet the criteria specified in the argument
COUNTIFS Applies criteria to cells across multiple ranges and counts the number of times all criteria are met.
COUPDAYBS Returns the number of days from the beginning of the coupon period to the settlement date using the specified or default day counting basis
COUPDAYS Returns the number of days in the coupon period that contains the settlement date using the specified or default day counting basis
COUPDAYSNC Returns the number of days from the settlement date to the next coupon date using the specified or default day counting basis
COUPNCD Returns the next coupon date after the settlement date using the specified or default day counting basis
COUPNUM Returns the number of coupons payable between the settlement date and maturity date using the specified or default day counting basis
COUPPCD Returns the previous coupon date before the settlement date using the specified or default day counting basis
COVAR Returns covariance; the average of the products of deviations for each data point pair
COVARIANCE.P Returns population covariance, the average of the products of deviations for each data point pair in two data sets.
COVARIANCE.S Returns the sample covariance, the average of the products of deviations for each data point pair in two data sets.
CRITBINOM Returns the smallest value for which the cumulative binomial distribution is less than or equal to a criterion value.
CSC Returns the cosecant of an angle specified in radians.
CSCH Return the hyperbolic cosecant of an angle specified in radians.
CUBEKPIMEMBER Returns a key performance indicator (KPI) property and displays the KPI name in the cell. A KPI is a quantifiable measurement, such as monthly gross profit or quarterly employee turnover, that is used to monitor an organization’s performance.
CUBEMEMBER Returns a member or tuple from the cube. Use to validate that the member or tuple exists in the cube.
CUBEMEMBERPROPERTY Returns the value of a member property from the cube. Use to validate that a member name exists within the cube and to return the specified property for this member.
CUBERANKEDMEMBER Returns the nth, or ranked, member in a set. Use to return one or more elements in a set, such as the top sales performer or the top 10 students.
CUBESET Defines a calculated set of members or tuples by sending a set expression to the cube on the server, which creates the set, and then returns that set to Microsoft Excel.
CUBESETCOUNT Returns the number of items in a set.
CUBEVALUE Returns an aggregated value from the cube.
CUMIPMT Returns the cumulative interest paid between two periods. Excel 2010 Improved accuracy.
CUMPRINC Returns the cumulative principal paid on a loan between two periods. Excel 2010 Improved accuracy.
DATE Returns the sequential Excel date / time serial number that represents a particular date using Year, Month, and Day inputs.
DATEDIF Calculates differences between two dates in terms of specified units and assumptions
DATEVALUE Converts a date text form to an Excel date / time serial number
DAVERAGE Returns the average of selected list or database entries based on specified criteria
DAY Converts an Excel date / time serial number to the day of a month
DAYS Returns the number of days between two dates.
DAYS360 Calculates the number of days between two dates using a specified 30 day month 360 day year method
DB Returns the depreciation of an asset for a specified period, using the fixed declining balance method
DBCS Converts half-width (single-byte) letters within a character string to full-width (double-byte) characters.

The name of the function (and the characters that it converts) depends upon your language settings.

For Japanese, this function changes half-width (single-byte) English letters or katakana within a character string to full-width (double-byte) characters.

DCOUNT Counts the cells containing numbers from a specified database that match specified criteria
DCOUNTA Counts non blank cells from a specified database that match specified criteria criteria
DDB Returns the deoreciation of an asset for a specified period, using the double-declining balance method or some other method that is specified
DEC2BIN Converts a decimal number to binary
DEC2HEX Converts a decimal number to hexadecimal
DEC2OCT Converts a decimal number to octal
DECIMAL Converts a text representation of a number in a given base into a decimal number.
DEGREES Converts radians to degrees
DELTA Tests whether two values are equal
DEVSQ Returns the sum of the squares of the deviations from the sample mean of up to 255 arguments. Was 30 arguments before Excel 2007.
DGET Extracts from a specified database a single value that matches specified criteria
DISC Returns the discount rate for a security using the specified or default day counting basis
DMAX Extracts maximum number in a column of a list or database that matches specified conditions
DMIN Extracts minimum number in a column of a list or database that matches specified conditions
DOLLAR Converts a number to text, using currency format
DOLLARDE Converts a dollar price (expressed as a fraction) into a dollar price expressed as a decimal number
DOLLARFR Converts a dollar price (expressed as a decimal number) into a dollar price expressed as a fraction
DPRODUCT Multiplies the values in a particular field of records that match the specified criteria in a database
DSTDEV Estimates standard deviation of a population based on a sample using numbers in a column of a list or database that match specified conditions
DSTDEVP Calculates the standard deviation based on the entire population using numbers in a column of a list or database that match specified conditions
DSUM Adds the numbers in the field column of records in the database that match the specified criteria
DURATION Returns the Macauley duration of a security with periodic interest payments using the specified or default day counting basis
DVAR Estimates the variance of a population based on a sample by using the numbers in a column of a list or database that match specified criteria
DVARP Calculates the variance of a population based on the entire population by using the numbers in a column of a list or database that match specified criteria
EDATE Returns the Excel date / time serial number of the date that is the indicated number of months before or after the specified number of months from the start_date
EFFECT Returns the effective annual interest rate of a given nominal rate with its compounding frequency
ENCODEURL Returns a URL-encoded string.
EOMONTH Returns the Excel date / time serial number of the last day of the month before or after a specified number of months from start_date
ERF Returns the error function integrated between lower_limit and upper_limit. Excel 2010 Improved accuracy.
ERF.PRECISE Returns the error function.
ERFC Returns the complementary ERF function integrated between x and infinity. Excel 2010 Improved accuracy.
ERFC.PRECISE Returns the complementary ERF function integrated between x and infinity.
ERROR.TYPE Returns a number corresponding to an Excel error type or returns #N/A if there is no error.
EUROCONVERT Converts a number to or from Euros to or from a member currency or converts between one euro member currency to another using the Euro as an intermediary (triangulation)
EVEN Rounds a number away from zero to the nearest even integer
EXACT Checks to see whether two text values are identical
EXP Returns e (=2.71828182845904) raised to the power of a given number
EXPON.DIST Returns either:
a. The cumulative distribution function of the exponential distribution, OR
b. The probability density function of the exponential distribution.
EXPONDIST Returns either:
a. The cumulative distribution function of the exponential distribution, OR
b. The probability density function of the exponential distribution.
F.DIST Returns either:
a. The cumulative distribution function of the F distribution, OR
b. The probability density function of the F distribution.
FDIST Returns the F probability distribution
F.DIST.RT Returns the (right-tailed) F probability distribution (degree of diversity) for two data sets.
F.INV Returns the inverse of the F probability distribution.
FINV Returns the inverse of the F probability distribution
F.INV.RT Returns the inverse of the (right-tailed) F probability distribution found using F.DIST.RT.
F.TEST Returns the result of an F-test, the two-tailed probability that the variances in array1 and array2 are not significantly different.
FTEST Returns the result of an F-test; the one-tailed probability that the variances in array1 and array2 are not significantly different
FACT Returns the factorial of a number
FACTDOUBLE Returns the double factorial of a number
FALSE Returns the logical value FALSE
FILTERXML Returns specific data from the XML content by using the specified XPath.
FIND Finds one text value within another (case sensitive)
FINDB Finds one text value within another (case sensitive) based on the number of bytes each character uses.
FISHER Returns the Fisher transformation at x
FISHERINV Returns the inverse of the Fisher transformation
FIXED Rounds and formats and stores a number as text with a fixed number of decimals with or without digit grouping separators.
FLOOR Rounds a number down towards 0 to the nearest multiple of significance. Excel 2010 Improved accuracy.
FLOOR.MATH Round a number down to the nearest integer or to the nearest multiple of significance.
FLOOR.PRECISE Returns a number that is rounded down to the nearest integer or to the nearest multiple of significance. Regardless of the sign of the number, the number is rounded down. However, if the number or the significance is zero, zero is returned.
FORECAST Calculates a predicted value of y for a given x value based on known values for x and y
FORMULATEXT Returns a formula as a string.
FREQUENCY Counts how often values occur within given ranges of values and returns those counts as a vertical array of numbers
FV Returns the future value of an investment
FVSCHEDULE Returns the future value of an initial principal after applying a series of compound interest rates
GAMMA Returns the gamma function value.
GAMMA.DIST Returns either:
a. The cumulative distribution function of the gamma distribution,OR
b. The probability density function of the gamma distribution.
GAMMA.INV Returns the inverse of the gamma cumulative distribution. If p = GAMMA.DIST(x,…), then GAMMA.INV(p,…) = x.
GAMMADIST Returns either:
a. The cumulative distribution function of the gamma distribution,OR
b. The probability density function of the gamma distribution.
GAMMAINV Returns the inverse of the gamma distribution
GAMMALN.PRECISE Returns the natural logarithm of the gamma function, Γ(x).
GAMMALN Returns the natural logarithm of the gamma function Γ(x). Excel 2010 Improved accuracy.
GAUSS Calculates the probability that a member of a standard normal population will fall between the mean and z standard deviations from the mean.
GCD Returns the greatest common divisor of 1 – 255 integers. Excel 2007 increased from 29 integers.
GEOMEAN Returns the geometric mean of an array or range of positive data. Excel 2010 Improved accuracy.
GESTEP Tests whether a number is greater than a threshold value
GETPIVOTDATA Returns data stored in a pivot table
GROWTH Calculates predicted exponential growth and returns the y-values for a series of specified new x-values by using known x-values and y-values
HARMEAN Returns the harmonic mean of a data set by calculating the reciprocal of the arithmetic mean of reciprocals. Up to 255 number arguments increased from 29 in 2007
HEX2BIN Converts a hexadecimal to a binary
HEX2DEC Converts a hexadecimal to a decimal
HEX2OCT Converts a hexadecimal to an octal
HLOOKUP Looks in the top row of a table or array and returns the value of the indicated cell
HOUR Converts an Excel date / time serial number to an hour
HYPERLINK Creates a shortcut that opens a document on your hard drive, a server or the internet
HYPGEOM.DIST HYPGEOM.DIST returns either:
a. The cumulative distribution probability of a given number of sample successes, given the sample size, population successes, and population size, OR
b. The probability mass function of a given number of sample successes, given the sample size, population successes, and population size.
HYPGEOMDIST Returns the hypergeometric distribution by calculating the probability of a given number of sample successes, given the sample size, population successes, and population size
IF Returns one value if the specified condition evaluates to TRUE and another value if it evaluates to FALSE.
Nesting limit increased from 7 to 64 in Excel 2007.
IFERROR Returns a value you specify if a formula evaluates to an error; otherwise, returns the result of the formula.
IFNA Returns the value you specify if the formula returns the #N/A error value; otherwise returns the result of the formula.
IMABS Returns the absolute value (modulus) of a complex number provided in the text format “x + yi” or “x + yj”
IMAGINARY Returns the imaginary coefficient of a complex number provided in the text format “x + yi” or “x + yj”
IMARGUMENT Returns the argument theta – an angle expressed in radians such that:
x + yi = |x + yi| * e^Ɵ = |x + yi|(cosƟ + isinƟ)
IMCONJUGATE Returns the complex conjugate of a complex number provided in the text format “x + yi” or “x + yj”
IMCOS Returns the cosine of a complex number provided in the text format “x + yi” or “x + yj”
IMCOSH Returns the hyperbolic cosine of a complex number provided in x+yi or x+yj text format.
IMCOT Returns the cotangent of a complex number provided in x+yi or x+yj text format.
IMCSC Returns the cosecant of a complex number provided in x+yi or x+yj text format.
IMCSCH Returns the hyperbolic cosecant of a complex number provided in x+yi or x+yj text format.
IMDIV Returns the quotient of two complex numbers provided in the text format “x + yi” or “x + yj”
IMEXP Returns the exponential of a complex number provided in the text format “x + yi” or “x + yj”
IMLN Returns the natural logarithm of a complex number provided in the text format “x + yi” or “x + yj”
IMLOG10 Returns the base-10 logarithm of a complex number provided in the text format “x + yi” or “x + yj”
IMLOG2 Returns the base-2 logarithm of a complex number provided in the text format “x + yi” or “x + yj”
IMPOWER Returns a complex number provided in the text format “x + yi” or “x + yj” raised to a user provided power.
IMPRODUCT Returns the product of 2 – 255 complex numbers provided in the text format “x + yi” or “x + yj”. Increased from 29 to 255 arguments in Excel 2007.
IMREAL Returns the real coefficient of a complex number provided in the text format “x + yi” or “x + yj”
IMSEC Returns the secant of a complex number provided in x+yi or x+yj text format.
IMSECH Returns the hyperbolic secant of a complex number provided in x+yi or x+yj text format.
IMSIN Returns the sine of a complex number provided in the text format “x + yi” or “x + yj”
IMSINH Returns the hyperbolic sine of a complex number provided in x+yi or x+yj text format.
IMSQRT Returns the square root of a complex number provided in the text format “x + yi” or “x + yj”
IMSUB Returns the difference of two complex numbers provided in the text format “x + yi” or “x + yj”
IMSUM Returns the sum of 2 – 255 complex numbers provided in the text format  “x + yi” or “x + yj”. Increased from 29 to 255 arguments in Excel 2007.
IMTAN Returns the tangent of a complex number provided in x+yi or x+yj text format.
INDEX Alternative forms. Array form returns a value or array of values. Reference form returns a reference. Volatile pre Excel 97.
INDIRECT Returns a reference indicated by a value provided as text. Volatile.
INFO returns information about the current operating environment
INT Rounds a number to the left to the nearest integer on a number line. (Positive rounded towards zero. Negative rounded away from zero.)
INTERCEPT Calculates from given x and y values the point at which a line will intersect the y-axis
INTRATE Returns the interest rate for a fully invested security using the specified or default day counting basis
IPMT Returns the amount of the interest element in a payment for an investment for a given period. Excel 2010 Improved accuracy.
IRR Returns the internal rate of return for a series of cash flows. Excel 2010 Improved accuracy.
ISBLANK Returns TRUE if the value is blank
ISERR Returns TRUE if the value is any error value except #N/A
ISERROR Returns TRUE if the value is any error value
ISEVEN Returns TRUE if the number is even
ISFORMULA Checks whether there is a reference to a cell that contains a formula, and returns TRUE or FALSE.
ISLOGICAL Returns TRUE if the value is a logical value
ISNA Returns TRUE if the value is the #N/A error value
ISNONTEXT Returns TRUE if the value is not text
ISNUMBER Returns TRUE if the value is a number
ISO.CEILING Returns a number that is rounded up to the nearest integer or to the nearest multiple of significance. Regardless of the sign of the number, the number is rounded up. However, if the number or the significance is zero, zero is returned.
ISODD Returns TRUE if the number is odd
ISOWEEKNUM Returns the number of the ISO week number of the year for a given date.
ISPMT Returns the interest associated with a specific loan payment with a constant principal repayment loan.
ISREF Returns TRUE if the value is a reference
ISTEXT Returns TRUE if the value is text
JIS Changes half-width (single-byte) English letters or katakana within a character string to full-width (double-byte) characters.
DBCS introduced in 2013 has same functionality.
KURT Returns the kurtosis of a data set; a measure that compares the relative peakedness or flatness of a distribution compared with the normal distribution. Up to 255 number arguments increased from 29 in 2007.
LARGE Returns the kth largest value in a data set
LCM Returns the least common multiple of 1 – 255 integers. Excel 2007 increased from 29 integers.
LEFT Returns the left most characters from a text value.
LEFTB Returns the first character or characters in a text string, based on the number of bytes you specify.
LEN Returns the number of characters in a text string
LENB Returns the number of bytes used to represent the characters in a text string
LINEST Entered as an array formula, LINEST returns an array that describes a line of best fit by using the least squares method
LN Returns the natural logarithm (base e = 2.71828182845904) of a number
LOG Returns the logarithm of a number to a specified base
LOG10 Returns the base-10 logarithm of a number
LOGEST Entered as an array formula, LOGEST calculates an exponential curve that fits known data and returns an array of values that describes that curve
LOGNORM.DIST Returns the lognormal distribution of x, where ln(x) is normally distributed with parameters Mean and Standard_dev. Returns either:
a. The cumulative density function of the lognormal distribution, OR
b. The probability density function of the lognormal distribution.
LOGNORM.INV Returns the inverse of the lognormal cumulative distribution function of x, where ln(x) is normally distributed with parameters Mean and Standard_dev. If p = LOGNORM.DIST(x,…) then LOGNORM.INV(p,…) = x.
LOGNORMDIST Returns the cumulative lognormal distribution of x, where ln(x) is normally distributed with known mean and standard deviation
LOGINV Returns the inverse of the lognormal cumulative distribution function of x, where ln(x) is normally distributed with given probability, mean, and standard deviation. If p = LOGNORM.DIST(x,…) then LOGINV(p,…) = x.
LOOKUP Alternative forms. Vector form looks up values in a one row or column range and returns a value in a second one row or column range. Array form looks in the first row or column of an array for the specified value and returns a value from the same position in the last row or column of the array.
LOWER Converts text to lowercase
MATCH Returns the relative position of an item in an array that matches a specified value in a specified order
MAX Returns the maximum value in a list of arguments ignoring logical values and text. Up to 255 number arguments increased from 30 in 2007.
MAXA Returns the maximum value in a list of arguments including logical values and text. Up to 255 number arguments increased from 30 in 2007.
MDETERM Returns the matrix determinant of an array
MDURATION Returns the Macauley modified duration for a security with an assumed par value of $100 using the specified or default day counting basis
MEDIAN Returns the median of the given numbers. Up to 255 number arguments increased from 30 in 2007.
MID Returns a specific number of characters from a string starting at a specified position
MIDB Returns a specific number of characters from a text string, starting at the position you specify, based on the number of bytes specified
MIN Returns the minimum value in a list of arguments ignoring logical values and text.  Up to 255 number arguments increased from 30 in 2007.
MINA Returns the minimum value in a list of arguments including logical values and text. Up to 255 number arguments increased from 30 in 2007.
MINUTE Converts an Excel date / time serial number to a minute in the hour.
MINVERSE Returns the matrix inverse of an array
MIRR Returns the modified internal rate of return based on different finance and reinvestment rates for negative and positive cash flows
MMULT Returns the matrix product of two arrays
MOD Returns the remainder from division with the result having the same sign as the divisor. Excel 2010 Improved accuracy.
MODE Returns the most common value in a data set. Up to 255 number arguments increased from 30 in 2007.
MODE.MULT Returns a vertical array of the most frequently occurring, or repetitive values in an array or range of data.
MODE.SNGL Returns the most frequently occurring, or repetitive, value in an array or range of data.
MONTH Converts an Excel date / time serial number to a month in the year number.
MROUND Returns a number rounded to the desired multiple. Midway points are rounded away from 0
MULTINOMIAL Returns the ratio of the factorial of a sum of values to the product of factorials. Excel 2007 increased from 29 number arguments to 255.
MUNIT Returns the unit matrix for the specified dimension.
N Returns a value converted to a number
NA Returns the error value #N/A
NEGBINOM.DIST Returns either:
a. The cumulative distribution function of the negative binomial distribution, OR
b. The probability density function of the negative binomial distribution.
NEGBINOMDIST Returns the negative binomial distribution; the probability that there will be number_f failures before the number_s-th success, when the constant probability of a success is probability_s
NETWORKDAYS Returns the number of whole working days between two dates excluding (if provided) specified holidays.
NETWORKDAYS.INTL Returns the number of whole workdays between two dates using parameters to indicate which and how many days are weekend days. Weekend days and any days that are specified as holidays are not considered as workdays.
NOMINAL Returns the nominal rate equivalent to a given annual effective with a given compounding frequency for the nominal rate
NORM.DIST Returns either:
a. the cumulative distribution function of the normal distribution, OR
b. the probability density function of the normal distribution.
NORM.INV Returns the inverse of the normal cumulative distribution for the specified mean and standard deviation.
NORM.S.DIST Returns either:
a. the cumulative distribution function of the standard normal distribution, OR
b. the probability density function of the standard normal distribution.
NORM.S.INV Returns the inverse of the standard normal cumulative distribution. The distribution has a mean of zero and a standard deviation of one.
NORMDIST Returns either:
a. The cumulative distribution function of the normal distribution, OR
b. The probability density function of the normal distribution.
NORMINV Returns the inverse of the normal cumulative distribution for the specified probability, mean, and standard deviation
NORMSDIST Returns the standard normal cumulative distribution function. The distribution has a mean of 0 and a standard deviation of 1
NORMSINV Returns the inverse of the standard normal cumulative distribution
NOT Reverses the logic of its argument
NOW Returns the Excel date / time serial number of the current date and time. Volatile.
NPER Returns the number of periods for an investment
NPV Returns the net present value of an investment based upon a series of periodic cash flows and a discount rate where the first cash flow is received at the end of the first period. Excel 2007 increased from values argument from 28 number arguments to 254.
NUMBERVALUE Converts text to a number, in a locale-independent way.
OCT2BIN Converts an octal number to binary
OCT2DEC Converts an octal number to decimal
OCT2HEX Converts an octal number to hexadecimal
ODD Rounds a number away from 0 to the nearest odd integer
ODDFPRICE Returns the price per $100 face value of a security with an odd first period using the specified or default day counting basis
ODDFYIELD Returns the yield of a security with an odd first period using the specified or default day counting basis
ODDLPRICE Returns the price per $100 face value of a security with an odd last period using the specified or default day counting basis
ODDLYIELD Returns the yield of a security with an odd last period using the specified or default day counting basis
OFFSET Returns a reference to a range that is a specified number of rows and columns from a cell or range of cells. Volatile.
OR Returns TRUE if any argument is TRUE
Excel 2007 onwards allow 255 Logical Conditions.
Excel 2003 and before limit was 30.
PDURATION Returns the number of periods required by an investment to reach a specified value.
PEARSON Returns the Pearson product moment correlation coefficient
PERCENTILE.EXC Returns the k-th percentile of values in a range, where k is in the range 0..1, exclusive.
PERCENTILE.INC Returns the k-th percentile of values in a range, where k is in the range 0..1, inclusive.
PERCENTILE Returns the kth percentile of values in a range
PERCENTRANK.EXC Returns the rank of a value in a data set as a percentage (0..1, exclusive) of the data set.
PERCENTRANK.INC Returns the rank of a value in a data set as a percentage (0..1, inclusive) of the data set.
PERCENTRANK Returns the percentage rank of a value in a data set
PERMUT Returns the number of permutations for a given number of objects that can be selected from a number of objects without replacement
PERMUTATIONA Returns the number of permutations for a given number of objects (with repetitions) that can be selected from the total objects.
PHI Returns the value of the density function for a standard normal distribution.
PHONETIC Extracts the phonetic (furigana) characters from a text string
PI Returns the number 3.14159265358979, the mathematical constant pi, accurate to 15 digits
PMT Returns the periodic payment for an annuity. Excel 2010 Improved accuracy.
POISSON.DIST Returns either:
a. the cumulative distribution function of the poisson distribution; OR
b. the probability density function of the poisson distribution,
POISSON Returns either:
a. The cumulative distribution function of the poisson distribution, OR
b. The probability density function of the poisson distribution.
POWER Returns the result of a number raised to a power.
PPMT Returns the amount of principal element in a payment for an investment for a given period. Excel 2010 Improved accuracy.
PRICE Returns the price per $100 face value of a security that pays periodic interest using the specified or default day counting basis
PRICEDISC Returns the price per $100 face value of a discounted security using the specified or default day counting basis
PRICEMAT Returns the price per $100 face value of a security that pays interest at maturity using the specified or default day counting basis
PROB Returns either the probability that values in a range are between two limits or if upper_limit is not specified, the probability that values in x_range are equal to lower_limit
PRODUCT Multiplies together 1 – 255 numbers. Excel 2007 increased from 30 number arguments to 255.
PROPER Capitalizes the first letter in each word of a text value
PV Returns the present value of an investment
QUARTILE.EXC Returns the quartile of the data set, based on percentile values from 0..1, exclusive.
QUARTILE.INC Returns the quartile of a data set, based on percentile values from 0..1, inclusive.
QUARTILE Returns the quartile of a data set
QUOTIENT Returns the integer portion of a division
RADIANS Converts degrees to radians
RAND Returns an evenly distributed random number greater than or equal to 0 and less than 1. Volatile. Excel 2010 Improved accuracy.
RANDBETWEEN Returns a random number between (and inclusive of) two specified numbers
RANK.AVG Returns the rank of a number in a list of numbers: its size relative to other values in the list; if more than one value has the same rank, the average rank is returned.
RANK.EQ Returns the rank of a number in a list of numbers. Its size is relative to other values in the list; if more than one value has the same rank, the top rank of that set of values is returned.
RANK Returns the rank of a number in a list of numbers. Its size is relative to other values in the list; if more than one value has the same rank, the top rank of that set of values is returned.
RATE Returns the interest rate per period of an annuity
RECEIVED Returns the amount received at maturity for a fully invested security using the specified or default day counting basis
REGISTER.ID Returns the register ID of the specified dynamic link library (DLL) or code resource that has been previously registered. Appears to be obsolete.
REPLACE Replaces characters within text
REPLACEB Replaces part of a text string, based on the number of bytes you specify, with a different text string.
REPT Repeats text a given number of times
RIGHT Returns the rightmost characters from a text value
RIGHTB Returns the last character or characters in a text string, based on the number of bytes you specify
ROMAN Converts an arabic number to Roman, as text
ROUND Rounds a number to a specified number of digits to the left (-) or right (+) of the decimal point. The midway digit 5 is rounded away from 0.
ROUNDDOWN Rounds a number down towards 0 to a specified number of digits to the left (-) or right (+) of the decimal point
ROUNDUP Round a number up away from 0 to a specified number of digits to the left (-) or right (+) of the decimal point
ROW Returns the row number of a reference
ROWS Returns the number of rows in a reference. Claimed volatile but apparently not.
RRI Returns an equivalent interest rate for the growth of an investment.
RSQ Returns the square of the Pearson product moment correlation coefficient through data points in known_y’s and known_x’s
RTD Retrieves real-time data from a program that supports COM automation
SEARCH Finds one text value within another (not case sensitive) and returns the number of the starting position
SEARCHB Finds one text string (find_text) within another text string (within_text), and returns the number of the starting position of find_text. The result is based on the number of bytes each character uses, beginning with start_num
SEC Returns the secant of an angle.
SECH Returns the hyperbolic secant of an angle.
SECOND Converts an Excel date / time serial number to a second
SERIESSUM Returns the sum of a power series expansion
SHEET Returns the sheet number of the reference sheet.
SHEETS Returns the number of sheets in a reference.
SIGN Returns 1 for positive numbers, 0 if the number is 0 and, -1 if the number is negative
SIN Returns the sine of a given angle given in radians
SINH Returns the hyperbolic sine of a given angle
SKEW Returns the skewness of a distribution based on a sample: a characterization of the degree of asymmetry of a distribution around its mean. Up to 255 number arguments increased from 30 in 2007.
SKEW.P Returns the skewness of a distribution based on a population: a characterization of the degree of asymmetry of a distribution around its mean.
SLN Returns the straight-line depreciation of an asset for one period.
SLOPE Returns the slope (vertical distance / horizontal distance) of the linear regression line through data points in known_y’s and known_x’s
SMALL Returns the kth smallest value in a data set
SQL.REQUEST Connects with an external data source, and runs a query from a worksheet. SQL.REQUEST then returns the result as an array. Appears to be obsolete.
SQRT Returns a positive square root.
SQRTPI Returns the square root of a number multiplied by pi
STANDARDIZE Returns a normalized value from a distribution with known mean and standard_dev of the population.
STDEV.P Calculates standard deviation based on the entire population given as arguments (ignores logical values and text).
STDEV.S Estimates standard deviation based on a sample (ignores logical values and text in the sample).
STDEVA Estimates standard deviation based on a sample including text and logical values. Up to 255 number arguments increased from 30 in 2007.
STDEVPA Calculates standard deviation based on the entire population including text and logical values. Up to 255 number arguments increased from 30 in 2007.
STDEV Estimates standard distribution based on a sample ignoring text and logical values. Up to 255 number arguments increased from 30 in 2007.
STDEVP Calculates standard distribution based on the entire population ignoring text and logical values. Up to 255 number arguments increased from 30 in 2007.
STEYX Returns the standard error of the predicted y-value for each x in the regression
SUBSTITUTE Substitutes new text for old text in a text string
SUBTOTAL Returns the subtotal in a list or database. The function can apply different aggregate functions to a list or database. Excel 2007 increased from 30 number arguments to 255.
SUM Adds its arguments. Excel 2007 increased from 30 number arguments to 255.
SUMIF Add the cells specified by a given criteria.
SUMIFS Adds the cells in a range that meet multiple criteria.
SUMPRODUCT Returns the sum of the products of corresponding array components. Excel 2007 increased from 30 number arguments to 255.
SUMSQ Returns the sum of the squares of 1 – 254 numbers. Excel 2007 increased from 30.
SUMX2MY2 Returns the sum of the difference of squares of corresponding values in two arrays
SUMX2PY2 Returns the sum of the sum of squares of corresponding values in two arrays
SUMXMY2 Returns the sum of squares of differences of corresponding values in two array
SYD Returns the sum of years’ digits depreciation of an asset for a specified period
T Converts its arguments to text
T.DIST Returns the Student’s left-tailed t-distribution of either:
a. The cumulative distribution function of the T distribution; OR
b. The probability density function of the T distribution,
T.DIST.2T Returns the two-tailed Student’s t-distribution.
T.DIST.RT Returns the right-tailed Student’s t-distribution.
T.INV Returns the left-tailed inverse of the Student’s t-distribution.
T.INV.2T Returns the two-tailed inverse of the Student’s t-distribution.
T.TEST Returns the probability associated with a Student’s t-Test.
TDIST Returns the probability for the Student t-distribution where a numeric value (x) is a calculated value of t for which the probability is to be computed
TINV Returns the t-value of the Student’s t-distribution based on given probability and degrees of freedom
TTEST Returns the probability associated with a student’s t-test
TAN Returns the tangent of a given angle given in radians
TANH Returns the hyperbolic tangent of a number
TBILLEQ Returns the bond-equivalent yield for a treasury bill
TBILLPRICE Returns the price per $100 face value for a Treasury bill
TBILLYIELD Returns the yield for a treasury bill
TEXT Formats a number and converts it to text
TIME Returns the decimal portion of an Excel date / time serial number for a particular time
TIMEVALUE Converts the time in an acceptable form of text enclosed in quotation marks to the decimal portion of an Excel date / time serial number
TODAY Returns the Excel date / time serial number of today’s date. Volatile.
TRANSPOSE Returns the transpose of an array
TREND Entered as an array formula, TREND fits a straight line using the least squares method to arrays of known_y’s and known_x’s and returns the y-values along that line for the array of specified new_x’s
TRIM Removes all spaces from text except single spaces between words
TRIMMEAN Calculates the mean by excluding a specified percentage of data points from the top and bottom tails of a data set
TRUE Returns the logical value TRUE
TRUNC Truncates a number to an integer or to specified precision by removing the fractional part of the number. (Serves to round down towards 0)
TYPE Returns the type of value (1 for value is a number; 2 for value is text; 4 for value is logical value; 16 for value is error value; 64 for value is array)
UNICHAR Returns the Unicode character that is referenced by the given numeric value.
UNICODE Returns the number (code point) corresponding to the first character of the text.
UPPER Converts text to uppercase
VALUE Converts a text argument to a number
VAR.P Calculates variance based on the entire population (ignores logical values and text in the population).
VAR.S Estimates variance based on a sample (ignores logical values and text in the sample).
VARA Estimates variance based on a sample including text and logical values
VARPA Calculates variance based on the entire population including text and logical values
VAR Estimates variance based on a sample ignoring logical values and text
VARP Calculates variance based on the entire population ignoring text and logical values
VDB Returns the depreciation of an asset for a specified or partial period using a variable declining balance method
VLOOKUP Locates a specified value in the leftmost column of a specified table, and returns the value in the same row from a specified column in the table
WEBSERVICE Returns data from a web service on the Internet or Intranet.
WEEKDAY Converts an Excel date / time serial number to the number of the day of the week based upon counting system of return_type.
Extended capabilities in Excel 2010.
WEEKNUM Returns the weeknumber in the year. The 1st week starts Jan-1; the 2nd week starts the following Sunday (return_type = 1) or Monday (return_type = 2).
Extended capabilities in Excel 2010.
WEIBULL.DIST Returns either:
a. The cumulative distribution function of the Weibull distribtion, or
b. The probability density function of the Weibull distribution.
WEIBULL Returns either:
a. The cumulative distribution function of the Weibull distribution, OR
b. The probability density function of the Weibull distribution.
WORKDAY Returns the Excel date / time serial number of the date before or after a specified number of workdays excluding holidays
WORKDAY.INTL Returns the date serial number before or after a specified number of workdays adjusting for user specified weekend parameters and holidays which are not considered as workdays.
XIRR Returns the annual effective interest rate for a schedule of cash flows received at specified dates
XNPV Returns the Net Present Value of a series a cash flows paid or received at specified dates discounting at the daily effective equivalent of a given annual effective rate.
XOR Returns a logical Exclusive Or of all arguments.
YEAR Converts an Excel date / time serial number to a year
YEARFRAC Returns the difference between start_date and end_date expressed as a number of years including decimal fraction of a year.
YEN Converts a number to text, using the ¥ (yen) currency format, with the number rounded to a specified place
YIELD Returns the yield on a security that pays periodic interest using the specified or default day counting basis
YIELDDISC Returns the annual yield for a discounted security using the specified or default day counting basis.
YIELDMAT Returns the annual yield of a security that pays interest at maturity using the specified or default day counting basis
Z.TEST Returns the one-tailed probability value of a z-test.
ZTEST Returns the one-tailed P-value of a z-test

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