Truncates a number to an integer by removing the fractional part of the number.
Syntax
TRUNC(number,num_digits)
Number is the number you want to truncate.
Num_digits is a number specifying the precision of the truncation. The default value for num_digits is 0 (zero).
Remark
TRUNC and INT are similar in that both return integers. TRUNC removes the fractional part of the number. INT rounds numbers down to the nearest integer based on the value of the fractional part of the number. INT and TRUNC are different only when using negative numbers:
TRUNC(4.3)
returns 4, but
INT(4.3)
returns 5 because 5 is the lower number.
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) 
=TRUNC(8.9) 
Integer part of 8.9 (8) 
=TRUNC(8.9) 
Integer part of 8.9 (8) 
=TRUNC(PI()) 
Integer part of pi (3) 
