Excel ROUNDDOWN Function

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.
- number - The number to round down.
- num_digits - The number of digits to which number should be rounded down.
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:
Example #2 - round to left
To round down values to the left of the decimal point, use zero or a negative number for digits:
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
- To round normally, use the ROUND function.
- To round to the nearest multiple, use the MROUND function.
- To round down to the nearest specified place, use the ROUNDDOWN function.
- To round down to the nearest specified multiple, use the FLOOR function.
- To round up to the nearest specified place, use the ROUNDUP function.
- To round up to the nearest specified multiple, use the CEILING function.
- To round down and return an integer only, use the INT function.
- To truncate decimal places, use the TRUNC function.
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