Excel FLOOR Function

Summary

The Excel FLOOR function rounds a given number down to the nearest specified multiple. FLOOR works like the MROUND function, but FLOOR always rounds down.

Purpose

Round a number down to the nearest specified multiple

Return value

A rounded number.

Syntax

=FLOOR (number, multiple)

Arguments

number - The number that should be rounded.
multiple - The multiple to use when rounding.

Usage notes

The Excel FLOOR function rounds a number down to a given multiple. For example, the following could be used to round a price in A1 down to the nearest 5 dollars.

=FLOOR(A1,5)

FLOOR can be a can be a useful function to set pricing after currency conversion, discounts, etc. For example, the formula below will round a value in A1 down to the nearest 1 dollar, then subtract 1 cent, to get a price like $2.99, $5.99, $49.99, etc.

=CEILING(A1,1) - 0.01

If you need more control over how FLOOR rounds negative numbers, see the FLOOR.MATH function.

FLOOR vs FLOOR.MATH

The FLOOR function differs from the FLOOR.MATH function in these ways:

FLOOR.MATH provides a default significance of 1, rounding to nearest integer.
FLOOR.MATH provides support for rounding negative numbers (toward zero, away from zero).
FLOOR.MATH appears to use the absolute value of the significance argument. Changing the sign of significance has no effect on the result.

Notes

FLOOR works like the MROUND function, but FLOOR always rounds down.
With a positive number, the value is rounded down toward zero.
With a negative number, the value is rounded down away from zero.
The FLOOR function can be a good way to can be a good way to set pricing after currency conversion, discounts, etc.