# A to Z of Excel Functions: The ISBLANK Function

26 April 2021

*Welcome back to our regular A to Z of Excel Functions blog. Today we look at the ISBLANK function. *

**The ISBLANK function**

At the time of writing, there are 12 **IS** functions, *i.e.* functions that give rise to a TRUE or FALSE value depending upon whether a certain condition is met:

**ISBLANK(reference):**checks whether the**reference**is to an empty cell**ISERR(value):**checks whether the**value**is an error (*e.g. #REF!, #DIV/0!, #NULL!*). This check specifically excludes*#N/A***ISERROR(value):**checks whether the**value**is an error (*e.g. #REF!, #DIV/0!, #NULL!*). This is probably the most commonly used of these functions in financial modelling**ISEVEN(number):**checks to see if the**number**is even**ISFORMULA(reference):**checks to see whether the**reference**is to a cell containing a formula**ISLOGICAL(value):**checks to see whether the**value**is a logical (TRUE or FALSE) value**ISNA(value):**checks to see whether the**value**is*#N/A*. This gives us the rather crude identity**ISERR + ISNA = ISERROR****ISNONTEXT(value):**checks whether the**value**is not text (*N.B.*blank cells are not text)**ISNUMBER(value):**checks whether the**value**is a number**ISODD(number):**checks to see if the**number**is odd. Personally, I find the number 46 very odd, but Excel doesn’t**ISREF(value):**checks whether the**value**is a reference**ISTEXT(value):**checks whether the**value**is text.

As stated above, the **ISBLANK **function checks whether the reference is to an empty cell and returns either TRUE or FALSE accordingly. It has the following syntax:

**ISVALUE(reference)**

The **ISBLANK** function has the following argument:

**reference:**this is required and represents the**reference**for which you wish to determine whether it is completely empty (blank).

It should be further noted that:

- cells with formulas that return "" (empty text) are not counted. This is different behaviour to the
**ISBLANK**function which deem empty text to be blank,*i.e.***COUNTA(range) + COUNTBLANK(range)**does not necessarily equal the number of cells in the**range**, which many modellers assume to be an identity - cells with spaces, zeroes or error values are not considered blank.

Please see my example below:

*We’ll continue our A to Z of Excel Functions soon. Keep checking back – there’s a new blog post every business day.*

*A full page of the function articles can be found here. *