Excel FLOOR Function

Excel Rounding Functions

The Excel Floor function is one of fifteen rounding functions in Excel.

A full list, along with comparison tables, is provided on the Excel Rounding Functions page.

Function Description

The Excel FLOOR function rounds a supplied number towards zero to the nearest multiple of a specified significance.

The syntax of the function is:

FLOOR( number, significance )

Where the arguments are as follows:

number-The number that is to be rounded.

The multiple of significance that the supplied number is to be rounded to.

(This should generally have the same arithmetic sign (positive or negitive) as the supplied number argument).

Positive and Negative Arguments

Note: In Excel 2003 & 2007, the significance argument must have the same arithmetic sign (positive or negative) as the number argument. If they have different arithmetic signs, the Floor function returns an error.

However, in later versions of Excel, the Floor function has been improved, so that it can now handle a negative number argument and a positive significance argument. In this case, the Floor function reverses the direction of the rounding (i.e. rounds the supplied number away from zero).

Floor Function Examples

In column B of the following spreadsheet, the Excel Floor function is used to round the positive and negative numbers 26.75 and -26.75 to different multiples of significance.

226.75=FLOOR( A2, 0.1 )
326.75=FLOOR( A3, 0.5 )
426.75=FLOOR( A4, 1 )
526.75=FLOOR( A5, 10 )
626.75=FLOOR( A6, 20 )
7-26.75=FLOOR( A7, -0.1 )
8-26.75=FLOOR( A8, -1 )
9-26.75=FLOOR( A9, -5 )

The above examples show how, when the number and the significance arguments have the same arithmetic sign, the Floor function rounds the supplied number towards zero.

Examples with Positive and Negative Arguments

Different combinations of positive and negative arguments, are shown in the spreadsheet below.

The results shown are those that would be obtained in current versions of Excel (2010 or later).

226.75=FLOOR( A2, 1 )
326.75=FLOOR( A3, -1 )
4-26.75=FLOOR( A4, 1 )
5-26.75=FLOOR( A5, -1 )
4-26.75-27 - returns an error in Excel 2007 & earlier

This example shows how:

For further details of the Excel Floor Function, see the Microsoft Office website.

Floor Function Errors

If you get an error from the Excel Floor function, this is likely to be one of the following:

Common Errors
In Excel 2010 or
Excel 2013:
- if the supplied number is positive and the supplied significance is negative.
In Excel 2007 or
- if the supplied significance value has a different arithmetic sign to the supplied number argument.
#DIV/0!-Occurs if the supplied significance argument = 0.
#VALUE!-Occurs if one or both of the supplied arguments is non-numeric.