## Summary

To calculate the square root of a number in Excel, you can use the SQRT function. In the example shown, the formula in C5 (copied down) is:

``````=SQRT(B5)
``````

The result is the square root of each number in column B.

## Generic formula

``=SQRT(number)``

## Explanation

The SQRT function is fully automatic and will return the square root of any positive number. For example, to get the square root of 25, you can use:

``````=SQRT(25) // returns 5
``````

To get the square root of 16:

``````=SQRT(16)  // returns 4
``````

To get the square root of a number in cell A1:

``````=SQRT(A1) // square root of A1
``````

### Negative numbers

If you give SQRT a negative number, it returns a #NUM! error:

``````=SQRT(-4) // returns #NUM!
``````

To use the SQRT function with negative numbers you nest the ABS function inside SQRT like this:

``````=SQRT(ABS(-4)) // returns 2
``````

The ABS function converts the negative number to a positive number and returns the result to the SQRT function, which calculates a final result.

### Exponent operator (^)

Another way to get the square root of a number in Excel is to use the exponent operator , the caret (^). To return the square root of a number in A1, you can use a formula like this:

``````=A1^(1/2) // square root
``````

The screen below shows how this formula looks in a worksheet: ### Nth root

Excel does not have a built-in function to get the nth root of a number. However, you can calculate the nth root of a number by raising the number to the power of 1/n:

``````=A1^(1/n) // nth root
``````

The screen below shows this formula in use: ### Square root with POWER

You can get also get the square root or nth root of a number with the POWER function.  POWER is a general function for raising a number to a given power, for example:

``````=POWER(2,2) // returns 4
=POWER(2,3) // returns 8
=POWER(2,4) // returns 16
``````

The general form for getting the nth root with POWER is:

``````=POWER(A1,1/n) // nth root
``````

For example:

``````=POWER(A1,1/2) // square root
=POWER(A1,1/3) // cube root
=POWER(A1,1/4) // fourth root
``````

The screen below shows how the POWER function can be used to calculate square root of the numbers in column A:  Author ### Dave Bruns

Hi - I'm Dave Bruns, and I run Exceljet with my wife, Lisa. Our goal is to help you work faster in Excel. We create short videos, and clear examples of formulas, functions, pivot tables, conditional formatting, and charts.