The SQRT function in Excel is used to calculate the square root of a number. Here’s how to use it:

1. Syntax: The syntax for the SQRT function is =SQRT(number), where number is the value for which you want to calculate the square root. The number must be non-negative; otherwise, Excel will return an error.

2. Basic Usage:

   • Select a cell where you want the result to appear.
   • Type =SQRT( and then enter the number or cell reference containing the number.
   • Close the parentheses and press Enter. For example, =SQRT(16) will return 4.

3. Using Cell References:

   • If the number is in cell A1, you can use =SQRT(A1) to calculate its square root.

4. Handling Errors:

   • If the number is negative, Excel will return a #NUM! error. To avoid this, ensure the input is non-negative.

5. Combining with Other Functions:

   • You can combine SQRT with other functions. For example, =SQRT(SUM(A1:A10)) will calculate the square root of the sum of values in cells A1 to A10.

6. Practical Example:

   • Suppose you have a list of numbers in column A, and you want to calculate their square roots in column B. In cell B1, enter =SQRT(A1) and drag the formula down to apply it to other cells.

By following these steps, you can easily calculate square roots in Excel using the SQRT function.