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Excel ROUNDDOWN Function

Excel ROUNDDOWN function
Summary 

The Excel ROUNDDOWN function returns a number rounded down to a given number of places. Unlike standard rounding, where only numbers less than 5 are rounded down, ROUNDDOWN rounds all numbers down.

Purpose 
Round down to given number of digits
Return value 
A rounded number.
Syntax 
=ROUNDDOWN (number, num_digits)
Arguments 
  • number - The number to round down.
  • num_digits - The number of digits to which number should be rounded down.
Usage notes 

The ROUNDDOWN function works like the ROUND function, except the ROUNDDOWN function will always round numbers down. The number of places to round to is controlled by the num_digits argument. Positive numbers round to the right of the decimal point, negative numbers round to the left, and zero rounds to the nearest 1. The table below summarizes this behavior:

Digits Behavior
>0 Round down to nearest .1, .01, .001, etc.
<0 Round down to nearest 10, 100, 1000, etc.
=0 Round down to nearest 1

Example #1 - round to right

To round down values to the right of the decimal point, use a positive number for digits:  

=ROUNDDOWN(A1,1) // Round down to 1 decimal place
=ROUNDDOWN(A1,2) // Round down to 2 decimal places
=ROUNDDOWN(A1,3) // Round down to 3 decimal places
=ROUNDDOWN(A1,4) // Round down to 4 decimal places

Example #2 - round to left

To round down values to the left of the decimal point, use zero or a negative number for digits:  

=ROUNDDOWN(A1,0) // Round down to nearest whole number
=ROUNDDOWN(A1,-1) // Round down to nearest 10
=ROUNDDOWN(A1,-2) // Round down to nearest 100
=ROUNDDOWN(A1,-3) // Round down to nearest 1000
=ROUNDDOWN(A1,-4) // Round down to nearest 10000

Example #3 - nesting

Other operations and functions can be nested inside ROUNDOWN. For example, to round down the result of A1 divided by B1, you can use a formula like this:

=ROUNDDOWN(A1/B1,0) // round down result to nearest integer

Rounding functions in Excel

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