This article describes the formula syntax and usage of the ROUNDDOWN function (function: A prewritten formula that takes a value or values, performs an operation, and returns a value or values. Use functions to simplify and shorten formulas on a worksheet, especially those that perform lengthy or complex calculations.) in Microsoft Excel.
Description
Rounds a number down, toward zero.
Syntax
ROUNDDOWN(number, num_digits)
The ROUNDDOWN function syntax has the following arguments (argument: A value that provides information to an action, an event, a method, a property, a function, or a procedure.):
 Number Required. Any real number that you want rounded down.
 Num_digits Required. 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 do I copy an example?
 Select the example in this article. If you are copying the example in Excel Online, copy and paste one cell at a time.
Important: Do not select the row or column headers.
Selecting an example from Help
 Press CTRL+C.
 Create a blank workbook or worksheet.
 In the worksheet, select cell A1, and press CTRL+V. If you are working in Excel Online, repeat copying and pasting for each cell in the example.
Important: For the example to work properly, you must paste it into cell A1 of the worksheet.
 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.
After you copy the example to a blank worksheet, you can adapt it to suit your needs.

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) 
