=MROUND(number,5)

If you need to round a number to the nearest multiple of 5, you can use the MROUND function and supply 5 for number of digits.

How this formula works

In the example, cell C6 contains this formula:

=MROUND(B6,5)

The value in B6 is 17 and the result is 15 since 15 is the nearest multiple of 5 to 17.

As you'd expect, you can use MROUND to round to other multiples as well:

And so on.

If you need to force rounding up or down to a nearest multiple, see links to the CEILING and FLOOR functions on this page.