MOD function
Returns the remainder after number is divided by divisor. The result has the same sign as divisor.
Syntax
MOD(number,divisor)
Number is the number for which you want to find the remainder.
Divisor is the number by which you want to divide number.
Remarks

If divisor is 0, MOD returns the #DIV/0! error value.

The MOD function can be expressed in terms of the INT function:
MOD(n, d) = n  d*INT(n/d)
Example
The example may be easier to understand if you copy it to a blank worksheet.
How to copy an example

Create a blank workbook or worksheet.

Select the example in the Help topic.
Note Do not select the row or column headers.
Selecting an example from Help

Press CTRL+C.

In the worksheet, select cell A1, and press CTRL+V.

To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.

