Built-in

Date and time

 * DATE function - Returns the serial number of a particular date
 * DATEDIF function - Calculates the number of days months
 * DATEVALUE function - Converts a date in the form of text to a serial number
 * DAY function - 	 - Converts a serial number to a day of the month
 * DAYS360 function - Calculates the number of days between two dates based on a 360-day year
 * HOUR function - Converts a serial number to an hour
 * MINUTE function - Converts a serial number to a minute
 * MONTH function - Converts a serial number to a month
 * NOW_function - Returns the serial number of the current date and time
 * SECOND function - Converts a serial number to a second
 * TIME function - Returns the serial number of a particular time
 * TIMEVALUE function - 	 - Converts a time in the form of text to a serial number
 * TODAY function - Returns the serial number of today's date
 * WEEKDAY function - Converts a serial number to a day of the week
 * YEAR function - Converts a serial number to a year

Information

 * CELL function - Returns information about the formatting location
 * ERROR.TYPE - Returns a number corresponding to an error type
 * INFO function - Returns information about the current operating environment
 * ISBLANK function - Returns TRUE if the value is blank
 * ISERR function - Returns TRUE if the value is any error value except #N
 * ISERROR function - Returns TRUE if the value is any error value
 * ISLOGICAL function - Returns TRUE if the value is a logical value
 * ISNONTEXT function - Returns TRUE if the value is not text
 * ISNUMBER function - Returns TRUE if the value is a number
 * ISREF function - Returns TRUE if the value is a reference
 * ISTEXT function - Returns TRUE if the value is text
 * N function - Returns a value converted to a number
 * NA function - Returns the error value #N
 * TYPE function - Returns a number indicating the data type of a value

Logical

 * AND function - Returns TRUE if all of its arguments are TRUE
 * FALSE function - Returns the logical value FALSE
 * IFS function - Tests a number of supplied conditions and returns a result corresponding to the first condition that evaluates to TRUE.
 * NOT function - Reverses the logic of its argument
 * OR function - Returns TRUE if any argument is TRUE
 * TRUE function - Returns the logical value TRUE

Lookup and reference

 * ADDRESS function - Returns a reference as text to a single cell in a worksheet
 * AREAS function - Returns the number of contiguous cells in a reference
 * CHOOSE function - Chooses a value from a list of values
 * COLUMN function - Returns the column number of a reference
 * COLUMNS function - Returns the number of columns in a reference
 * HLOOKUP function - Looks in the top row of an array and returns the value of the indicated cell
 * INDIRECT function - Returns a reference indicated by a text value
 * LOOKUP function - Looks up values in a vector or array
 * MATCH function - Looks up values in a reference or array
 * OFFSET function - Returns a reference offset from a given reference
 * ROW_function - Returns the row number of a reference
 * ROWS_function - Returns the number of rows in a reference
 * SWITCH function - Compares a number of supplied values to a supplied test expression and returns a result corresponding to the first value that matches the test expression.
 * VLOOKUP function - Looks in the first column of an array and moves across the row to return the value of a cell

Math

 * ABS function - Returns the absolute value of a number
 * ACOS function - Returns the arccosine of a number
 * ACOSH function - Returns the inverse hyperbolic cosine of a number
 * ASIN function - Returns the arcsine of a number
 * ASINH function - Returns the inverse hyperbolic sine of a number
 * ATAN function - Returns the arctangent of a number
 * ATAN2 function - Returns the arctangent from x- and y-coordinates
 * ATANH function - Returns the inverse hyperbolic tangent of a number
 * CEILING function - Rounds a number to the nearest integer or to the nearest multiple of significance
 * COMBIN function - Returns the number of combinations for a given number of objects
 * COS function - Returns the cosine of a number
 * COSH function - Returns the hyperbolic cosine of a number
 * DEGREES function - Converts radians to degrees
 * EVEN_function - Rounds a number up to the nearest even integer
 * EXP_function - Returns e raised to the power of number.
 * FACT_function - Returns the factorial of a number
 * INT function - Rounds a number down to the nearest integer
 * LN_function - Returns the natural logarithm of a number
 * LOG_function - Returns the logarithm of a number to a specified base
 * LOG10_function - Returns the base-10 logarithm of a number
 * MOD_function - Returns the remainder from division
 * ODD_function - Rounds a number up to the nearest odd integer
 * PI function - Returns the value of pi
 * POWER_function - Returns the result of a number raised to a power
 * PRODUCT_function - Multiplies its arguments
 * RADIANS function - Converts degrees to radians
 * RAND function - Returns a random number between 0 and 1
 * RANDBETWEEN function - Returns a random number between the numbers you specify
 * ROMAN function - Converts an arabic numeral to roman as text
 * ROUND function - Rounds a number to a specified number of digits
 * ROUNDDOWN function - Rounds a number down toward zero
 * ROUNDUP function - Rounds a number up away from zero
 * SIGN_function - Returns the sign of a number
 * SIN function - Returns the sine of the given angle
 * SINH function - Returns the hyperbolic sine of a number
 * SQRT function - Returns a positive square root
 * SUBTOTAL function - Returns a subtotal in a list or database
 * SUM function - Adds its arguments
 * SUMIF function - Adds the cells specified by a given criteria
 * SUMPRODUCT function - Returns the sum of the products of corresponding array components
 * SUMSQ_function - Returns the sum of the squares of the arguments
 * SUMX2MY2 function - Returns the sum of the difference of squares of corresponding values in two arrays
 * SUMX2PY2 function - Returns the sum of the sum of squares of corresponding values in two arrays
 * SUMXMY2 function - Returns the sum of squares of differences of corresponding values in two arrays
 * TAN function - Returns the tangent of a number
 * TANH function - Returns the hyperbolic tangent of a number
 * TRUNC function - Truncates a number to an integer

Statistical

 * AVEDEV function - Returns the average of the absolute deviations of data points from their mean
 * AVERAGE function - Returns the average of its arguments
 * CORREL function - Returns the correlation coefficient between two data sets
 * COUNT function - Counts how many numbers are in the list of arguments
 * COUNTA function - Counts how many values are in the list of arguments
 * COUNTBLANK function - Counts the number of blank cells within a range
 * COUNTIF function - Counts the number of cells within a range that meet the given criteria
 * DEVSQ_function - Returns the sum of squares of deviations
 * FISHER function - Returns the Fisher transformation
 * FISHERINV function - Returns the inverse of the Fisher transformation
 * FORECAST function - Returns a value along a linear trend
 * FREQUENCY function - Returns a frequency distribution as a vertical array
 * GAMMALN function - Returns the natural logarithm of the gamma function G(x)
 * GEOMEAN function - Returns the geometric mean
 * GROWTH function - Returns values along an exponential trend
 * HARMEAN function - Returns the harmonic mean
 * INTERCEPT function - Returns the intercept of the linear regression line
 * KURT function - Returns the kurtosis of a data set
 * LARGE function - Returns the k-th largest value in a data set
 * LINEST function - Returns the parameters of a linear trend
 * LOGEST function - Returns the parameters of an exponential trend
 * MAX function - Returns the maximum value in a list of arguments
 * MAXA_function - Returns the maximum value in a list of arguments including numbers
 * MEDIAN function - Returns the median of the given numbers
 * MIN_function - Returns the minimum value in a list of arguments
 * MINA function - Returns the smallest value in a list of arguments including numbers
 * MAXIFS function - Returns the largest value from a subset of values in a list that are specified according to one or more criteria.
 * MINIFS function - Returns the smallest value from a subset of values in a list that are specified according to one or more criteria.
 * NORMINV function - Returns the inverse of the normal cumulative distribution
 * PEARSON function - Returns the Pearson product moment correlation coefficient
 * PERMUT function - 	Statistical	 - Returns the number of permutations for a given number of objects
 * PROB function - Returns the probability that values in a range are between two limits
 * RSQ function - Returns the square of the Pearson product moment correlation coefficient
 * SKEW function - Returns the skewness of a distribution
 * SLOPE function - Returns the slope of the linear regression line
 * SMALL function - Returns the k-th smallest value in a data set
 * STANDARDIZE function - Returns a normalized value
 * STDEVA function - Estimates standard deviation based on a sample including numbers
 * STDEVPA function - Calculates standard deviation based on the entire population including numbers
 * STEYX function - Returns the standard error of the predicted y-value for each x in the regression
 * TREND function - Returns values along a linear trend
 * TRIMMEAN function - Returns the mean of the interior of a data set
 * VARA_function - Estimates variance based on a sample including numbers
 * VARPA_function - Calculates variance based on the entire population including numbers
 * ZTEST function - Returns the one-tailed probability-value of a z-test

Text

 * CHAR function - Returns the character specified by the code number
 * CLEAN function - Removes all nonprintable characters from text
 * CODE function - Returns a numeric code for the first character in a text string
 * CONCAT function - Joins a range of cells into a single text item
 * CONCATENATE function - Joins several text items into one text item
 * DOLLAR function - Converts a number to text using the $ (dollar) currency format
 * EXACT function - Checks to see if two text values are identical
 * FIND - Finds one text value within another (case-sensitive)
 * FIXED function - Formats a number as text with a fixed number of decimals
 * JOINTEXT function - Joins a range of cells into a single text item with a user-defined delimiter
 * LEFT - Returns the leftmost characters from a text value
 * LEN - Returns the number of characters in a text string
 * LOWER function - Converts text to lowercase
 * MID - Returns a specific number of characters from a text string starting at the position you specify
 * PROPER function - Capitalizes the first letter in each word of a text value
 * [[REPLACE]|REPLACE] - Replaces characters within text
 * REPT_function - Repeats text a given number of times
 * RIGHT - Returns the rightmost characters from a text value
 * SEARCH - Finds one text value within another (not case-sensitive)
 * SUBSTITUTE_function - Substitutes new text for old text in a text string
 * T_function - Converts its arguments to text
 * TEXT_function - Formats a number and converts it to text
 * TRIM function - Removes spaces from text
 * UPPER_function - Converts text to uppercase
 * VALUE function - Converts a text argument to a number