Rounds a number down, toward zero.
Syntax
ROUNDDOWN(number,num_digits)
Number is any real number that you want rounded down.
Num_digits is the number of digits to which you want to round number.
Remarks
 ROUNDDOWN behaves like ROUND, except that it always rounds a number down.
 If num_digits is greater than 0 (zero), then number is rounded down to the specified number of decimal places.
 If num_digits is 0, then number is rounded down to the nearest integer.
 If num_digits is less than 0, then number is rounded down to the left of the decimal point.
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) 
=ROUNDDOWN(3.2, 0) 
Rounds 3.2 down to zero decimal places (3) 
=ROUNDDOWN(76.9,0) 
Rounds 76.9 down to zero decimal places (76) 
=ROUNDDOWN(3.14159, 3) 
Rounds 3.14159 down to three decimal places (3.141) 
=ROUNDDOWN(3.14159, 1) 
Rounds 3.14159 down to one decimal place (3.1) 
=ROUNDDOWN(31415.92654, 2) 
Rounds 31415.92654 down to 2 decimal places to the left of the decimal (31400) 
