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Excel Math Functions
The Excel Math Functions perform many of the common mathematical calculations, including basic arithmetic, conditional sums & products, exponents & logarithms, and the trigonometric ratios. Mathematicians may also find the Excel Statistical Functions and Excel Engineering Functions useful.
The tables below list all the current builtin Excel math functions, grouped into categories, to help you to find the function you need. Selecting a function will take you to a full description of the function, with examples of use and common errors.
Note that some of the Excel math functions listed below are new to Excel 2007, Excel 2010 or Excel 2013, so are not available in earlier versions of Excel.
Excel Math and Trig Functions List

ABS  Returns the absolute value (ie. the modulus) of a supplied number  SIGN  Returns the sign (+1, 1 or 0) of a supplied number  GCD  Returns the Greatest Common Divisor of two or more supplied numbers  LCM  Returns the Least Common Multiple of two or more supplied numbers 

SUM  Returns the sum of a supplied list of numbers  PRODUCT  Returns the product of a supplied list of numbers  POWER  Returns the result of a given number raised to a supplied power  SQRT  Returns the positive square root of a given number  QUOTIENT  Returns the integer portion of a division between two supplied numbers  MOD  Returns the remainder from a division between two supplied numbers  AGGREGATE  Performs a specified calculation (eg. the sum, product, average, etc.) for a list or database, with the option to ignore hidden rows and error values (New in Excel 2010)  SUBTOTAL  Performs a specified calculation (eg. the sum, product, average, etc.) for a supplied set of values 

CEILING  Rounds a number away from zero (ie. rounds a positive number up and a negative number down), to a multiple of significance  CEILING.PRECISE  Rounds a number up, regardless of the sign of the number, to a multiple of significance (New in Excel 2010)  ISO.CEILING  Rounds a number up, regardless of the sign of the number, to a multiple of significance. (New in Excel 2010)  CEILING.MATH  Rounds a number up to the nearest integer or to the nearest multiple of significance (New in Excel 2013)  EVEN  Rounds a number away from zero (ie. rounds a positive number up and a negative number down), to the next even number  FLOOR  Rounds a number towards zero, (ie. rounds a positive number down and a negative number up), to a multiple of significance  FLOOR.PRECISE  Rounds a number down, regardless of the sign of the number, to a multiple of significance (New in Excel 2010)  FLOOR.MATH  Rounds a number down, to the nearest integer or to the nearest multiple of significance (New in Excel 2013)  INT  Rounds a number down to the next integer  MROUND  Rounds a number up or down, to the nearest multiple of significance  ODD  Rounds a number away from zero (ie. rounds a positive number up and a negative number down), to the next odd number  ROUND  Rounds a number up or down, to a given number of digits  ROUNDDOWN  Rounds a number towards zero, (ie. rounds a positive number down and a negative number up), to a given number of digits  ROUNDUP  Rounds a number away from zero (ie. rounds a positive number up and a negative number down), to a given number of digits  TRUNC  Truncates a number towards zero (ie. rounds a positive number down and a negative number up), to the next integer. 

MDETERM  Returns the matrix determinant of a supplied array  MINVERSE  Returns the matrix inverse of a supplied array  MMULT  Returns the matrix product of two supplied arrays  MUNIT  Returns the unit matrix for a specified dimension (New in Excel 2013) 

RAND  Returns a random number between 0 and 1  RANDBETWEEN  Returns a random number between two given integers 
 
SUMIF  Adds the cells in a supplied range, that satisfy a given criteria  SUMIFS  Adds the cells in a supplied range, that satisfy multiple criteria (New in Excel 2007) 

SUMPRODUCT  Returns the sum of the products of corresponding values in two or more supplied arrays  SUMSQ  Returns the sum of the squares of a supplied list of numbers  SUMX2MY2  Returns the sum of the difference of squares of corresponding values in two supplied arrays  SUMX2PY2  Returns the sum of the sum of squares of corresponding values in two supplied arrays  SUMXMY2  Returns the sum of squares of differences of corresponding values in two supplied arrays  SERIESSUM  Returns the sum of a power series 

PI  Returns the constant value of pi  SQRTPI  Returns the square root of a supplied number multiplied by pi  DEGREES  Converts Radians to Degrees  RADIANS  Converts Degrees to Radians  COS  Returns the Cosine of a given angle  ACOS  Returns the Arccosine of a number  COSH  Returns the hyperbolic cosine of a number  ACOSH  Returns the inverse hyperbolic cosine of a number  SEC  Returns the secant of an angle (New in Excel 2013)  SECH  Returns the hyperbolic secant of an angle (New in Excel 2013)  SIN  Returns the Sine of a given angle  ASIN  Returns the Arcsine of a number  SINH  Returns the Hyperbolic Sine of a number  ASINH  Returns the Inverse Hyperbolic Sine of a number  CSC  Returns the cosecant of an angle (New in Excel 2013)  CSCH  Returns the hyperbolic cosecant of an angle (New in Excel 2013)  TAN  Returns the Tangent of a given angle  ATAN  Returns the Arctangent of a given number  ATAN2  Returns the Arctangent of a given pair of x and y coordinates  TANH  Returns the Hyperbolic Tangent of a given number  ATANH  Returns the Inverse Hyperbolic Tangent of a given number  COT  Returns the cotangent of an angle (New in Excel 2013)  COTH  Returns the hyperbolic cotangent of an angle (New in Excel 2013)  ACOT  Returns the arccotangent of a number (New in Excel 2013)  ACOTH  Returns the hyperbolic arccotangent of a number (New in Excel 2013) 

EXP  Returns e raised to a given power  LN  Returns the natural logarithm of a given number  LOG  Returns the logarithm of a given number, to a specified base  LOG10  Returns the base 10 logarithm of a given number 

FACT  Returns the Factorial of a given number  FACTDOUBLE  Returns the Double Factorial of a given number  MULTINOMIAL  Returns the Multinomial of a given set of numbers 

BASE  Converts a number into a text representation, with the supplied base (New in Excel 2013)  DECIMAL  Converts a text representation of a number in a specified base into a decimal number (New in Excel 2013)  COMBIN  Returns the number of combinations (without repititions) for a given number of objects  COMBINA  Returns the number of combinations (with repetitions) for a given number of items (New in Excel 2013)  ARABIC  Converts a Roman numeral to an Arabic numeral (New in Excel 2013)  ROMAN  Returns a text string depicting the roman numeral for a given number 

Further details of the Excel Math functions are provided on the Microsoft Office Website.