Alphabetical - I

IF	The value based on whether a condition is True or False.
IFERROR	The value or something else if it evaluates to an error.
IFNA	The value or something else if it evaluates to #N/A.
IFS	(2019) The value based on multiple True or False conditions.
IMABS	The absolute value of a complex number.
IMAGE	(2024) The image from a web URL.
IMAGINARY	The imaginary coefficient of a complex number.
IMARGUMENT	The theta argument in radians.
IMCONJUGATE	The complex conjugate of a complex number.
IMCOS	The cosine of a complex number.
IMCOSH	The hyperbolic cosine of a complex number.
IMCOT	The cotangent of a complex number.
IMCSC	The cosecant of a complex number.
IMCSCH	The hyperbolic cosecant of a complex number.
IMDIV	The quotient of two complex numbers.
IMEXP	The exponential of a complex number.
IMLN	The natural logarithm of a complex number.
IMLOG10	The base-10 logarithm of a complex number.
IMLOG2	The base-2 logarithm of a complex number.
IMPOWER	The complex number raised to an integer number.
IMPRODUCT	The product of two or more complex numbers.
IMREAL	The real coefficient of a complex number.
IMSEC	The secant of a complex number.
IMSECH	The hyperbolic secant of a complex number.
IMSIN	The sine of a complex number.
IMSINH	The hyperbolic sine of a complex number.
IMSQRT	The square root of a complex number.
IMSUB	The difference of two complex numbers.
IMSUM	The sum of two or more complex numbers.
IMTAN	The tangent of a complex number.
INDEX	The value from a cell range which is the intersection of a row AND a column.
INDIRECT	The value of a given cell reference specified by a text string.
INFO	The text string returning useful information about the environment.
INT	The number rounded down to the nearest integer.
INTERCEPT	The intersection with the y-axis using a linear regression plotted through known values.
INTRATE	The interest rate for a security held to maturity.
IPMT	The interest amount paid on a given period on a loan with fixed interest.
IRR	The interest rate for a series of unequal cash flows at regular intervals (implicit reinvestment rate).
ISBLANK	The boolean True or False depending if the value is blank.
ISERR	The boolean True or False depending if the value is an error (excluding #N/A).
ISERROR	The boolean True or False depending if the value is an error.
ISEVEN	The boolean True or False depending if the value is an even number.
ISFORMULA	The boolean True or False depending if the cell contains a formula.
ISLOGICAL	The boolean True or False depending if the value is True or False.
ISNA	The boolean True or False depending if the value is #N/A.
ISNONTEXT	The boolean True or False depending if the value is non text.
ISNUMBER	The boolean True or False depending if the value is a number.
ISO.CEILING	(CELING.MATH) The number rounded up to the nearest integer or significant figure (renamed).
ISODD	The boolean True or False depending if the value is an odd number.
ISOMITTED	(2024) The boolean True or False depending whether the value in a LAMBDA is missing.
ISOWEEKNUM	The week number in the year for a given date (based on European convention).
ISPMT	(Compatibility) The interest paid for a given period in a series of equal cash flows at regular intervals (incorrectly).
ISREF	The boolean True or False depending if the value is a cell reference.
ISTEXT	The boolean True or False depending if the value is text.

IF The value based on whether a condition is True or False.
IFERROR The value or something else if it evaluates to an error.
IFNA The value or something else if it evaluates to #N/A.
IFS (2019) The value based on multiple True or False conditions.
IMABS The absolute value of a complex number.
IMAGE (2024) The image from a web URL.
IMAGINARY The imaginary coefficient of a complex number.
IMARGUMENT The theta argument in radians.
IMCONJUGATE The complex conjugate of a complex number.
IMCOS The cosine of a complex number.
IMCOSH The hyperbolic cosine of a complex number.
IMCOT The cotangent of a complex number.
IMCSC The cosecant of a complex number.
IMCSCH The hyperbolic cosecant of a complex number.
IMDIV The quotient of two complex numbers.
IMEXP The exponential of a complex number.
IMLN The natural logarithm of a complex number.
IMLOG10 The base-10 logarithm of a complex number.
IMLOG2 The base-2 logarithm of a complex number.
IMPOWER The complex number raised to an integer number.
IMPRODUCT The product of two or more complex numbers.
IMREAL The real coefficient of a complex number.
IMSEC The secant of a complex number.
IMSECH The hyperbolic secant of a complex number.
IMSIN The sine of a complex number.
IMSINH The hyperbolic sine of a complex number.
IMSQRT The square root of a complex number.
IMSUB The difference of two complex numbers.
IMSUM The sum of two or more complex numbers.
IMTAN The tangent of a complex number.
INDEX The value from a cell range which is the intersection of a row AND a column.
INDIRECT The value of a given cell reference specified by a text string.
INFO The text string returning useful information about the environment.
INT The number rounded down to the nearest integer.
INTERCEPT The intersection with the y-axis using a linear regression plotted through known values.
INTRATE The interest rate for a security held to maturity.
IPMT The interest amount paid on a given period on a loan with fixed interest.
IRR The interest rate for a series of unequal cash flows at regular intervals (implicit reinvestment rate).
ISBLANK The boolean True or False depending if the value is blank.
ISERR The boolean True or False depending if the value is an error (excluding #N/A).
ISERROR The boolean True or False depending if the value is an error.
ISEVEN The boolean True or False depending if the value is an even number.
ISFORMULA The boolean True or False depending if the cell contains a formula.
ISLOGICAL The boolean True or False depending if the value is True or False.
ISNA The boolean True or False depending if the value is #N/A.
ISNONTEXT The boolean True or False depending if the value is non text.
ISNUMBER The boolean True or False depending if the value is a number.
ISO.CEILING (CELING.MATH) The number rounded up to the nearest integer or significant figure (renamed).
ISODD The boolean True or False depending if the value is an odd number.
ISOMITTED (2024) The boolean True or False depending whether the value in a LAMBDA is missing.
ISOWEEKNUM The week number in the year for a given date (based on European convention).
ISPMT (Compatibility) The interest paid for a given period in a series of equal cash flows at regular intervals (incorrectly).
ISREF The boolean True or False depending if the value is a cell reference.
ISTEXT The boolean True or False depending if the value is text.