You can use mathematical functions in custom tables and fields. See Adding a New Custom Table and Defining and Editing Field Formula for further details. Below are explanations of available mathematical functions.

ACOS(number)
Returns the angle, in radians, whose cosine is the given number. Also referred to as arccosine.

ASIN(number)
Returns the angle, in radians, whose sine is a given number. Also referred to as arcsine.

ATAN(number)
Returns the angle in radians whose tangent is a given number. Also referred to as arctangent.

CEILING(number)
Returns the smallest integer that is greater than, or equal to, the a given number.COS(number)
Returns the trigonometric cosine of a given angle, in radians.

COSH(number)
Returns the hyperbolic cosine of a given number.

COT(number)
Returns the hyperbolic sine of a given number.

DIV(number1, number2)
Returns the number of times number2 fits completely in number1.

EXP(number)
Returns the exponential value of a given number.

FLOOR(number)
Returns the largest integer less than or equal to the given numeric expression.

ISINFINITY(number)
Returns -1 if the number evaluates to negative infinity, 1 if it evaluates to positive infinity, and 0 otherwise.

ISINTEGER(number)
Returns whether a given number is a whole number.

LOG(number)
Returns the natural logarithm of a given number.

LOG10(number)
Returns the base-10 logarithm of the given float expression

MAXVAL(number1,number2)
Returns the highest of two numbers.

MINVAL(number1,number2)
Returns the smallest of two numbers.

MOD(number1,number2)
Returns the remainder of dividing number1 by number2 (modulo).

PI()
Returns the constant value of the mathematical PI.

POWER(number1,number2)
Returns the value of the given number raised to a specified power.

RAND()
Returns a random number between 0 and 32767

RANK()
Returns the rank (i.e. row number) of the current record in a table.

RANKASC(order_by_field)
Returns the row number ordered by given field in ascending manner.
You can also sort by multiple columns: RANKASC([partitionA],[paritionB][partitionN],[orderByField])
Example: RANKASC([EmployeeID],[CategoryID],[Quantity])

RANKDESC(order_by_field)
Returns the row number ordered by given field in descending manner.
You can also sort by multiple columns: RANKDESC([partitionA],[paritionB][partitionN],[orderByField])
Example: RANKDESC([EmployeeID],[CategoryID],[Quantity])

ROUND(number,precision)
Returns the given number, rounded to a specified precision.

SIN(number)
Returns the trigonometric sine of a given angle, in radians.

SINH(number)
Returns the hyperbolic sine of a given number.

SQRT(number)
Returns the square root of a given number.

TAN(number)
Returns the tangent of a given number.

TANH(number)
Returns the hyperbolic tan of a given number.

TOBIGINT(string)
Converts a string reperesenting a valid BigInt value to BigInt type.

TODOUBLE(string)
Converts a string reperesenting a valid double value to Double type.

TOINT(string)
Converts a string reperesenting a valid Int value to Int type.