Rounds number down, toward zero, to the nearest multiple of significance.
Syntax
FLOOR(number,significance)
Number is the numeric value you want to round.
Significance is the multiple to which you want to round.
Remarks
 If either argument is nonnumeric, FLOOR returns the #VALUE! error value.
 If number and significance have different signs, FLOOR returns the #NUM! error value.
 Regardless of the sign of number, a value is rounded down when adjusted away from zero. If number is an exact multiple of significance, no rounding occurs.
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.

A 
B 
Formula 
Description (Result) 
=FLOOR(2.5, 1) 
Rounds 2.5 down to nearest multiple of 1 (2) 
=FLOOR(2.5, 2) 
Rounds 2.5 down to nearest multiple of 2 (2) 
=FLOOR(2.5, 2) 
Returns an error, because 2.5 and 2 have different signs (#NUM!) 
=FLOOR(1.5, 0.1) 
Rounds 1.5 down to the nearest multiple of 0.1 (1.5) 
=FLOOR(0.234, 0.01) 
Rounds 0.234 down to the nearest multiple of 0.01 (0.23) 
