How to use the Excel ROUNDDOWN function

Summary

The Excel ROUNDDOWN function returns a number rounded down to a given number of decimal places. Unlike standard rounding, where only numbers less than 5 are rounded down, ROUNDDOWN rounds all numbers 1-9 down.

Purpose

Round a number down to a 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 when rounding, the ROUNDDOWN function will always round the numbers 1-9 down.

The ROUNDDOWN function can round either to the left or right of the decimal point.

If num_digits > 0, number is rounded down to the specified number of decimal places to the right of the decimal point.

If num_digits < 0, number is rounded down to the left of the decimal point (i.e. to the nearest 10, 100, 1000, etc.).

If num_digits = 0, number is rounded down to the nearest integer.

Related functions

Excel ROUND Function

The Excel ROUND function returns a number rounded to a given number of digits. The ROUND function can round to the right or left of the decimal point.

Excel ROUNDUP Function

The Excel ROUNDUP function returns a number rounded up to a given number of decimal places. Unlike standard rounding, where numbers less than 5 are rounded down, ROUNDUP always rounds numbers 1-9 up.

Excel ROUNDDOWN Function

The Excel ROUNDDOWN function returns a number rounded down to a given number of decimal places. Unlike standard rounding, where only numbers less than 5 are rounded down, ROUNDDOWN rounds all numbers 1-9 down.

Excel CEILING Function

The Excel CEILING function returns a given number rounded up to a specified multiple. For example, =CEILING(A1,5) could be used to round a price in A1 to the nearest 5 dollars. CEILING always rounds up.

Excel FLOOR Function

The Excel FLOOR function rounds a given number down to the nearest specified multiple. FLOOR works like the MROUND function, but FLOOR always rounds down.

Excel MROUND Function

The Excel MROUND function returns a number rounded to a given multiple. MROUND will round a number up or down, depending on the nearest multiple.

Excel EVEN Function

The Excel EVEN function returns the next even integer after rounding a given number up. The EVEN function always rounds numbers up (away from zero) so positive numbers become larger and negative numbers become smaller (i.e. more negative).

Excel ODD Function

The Excel ODD function returns the next odd integer after rounding a given number up. The ODD function always rounds numbers up (away from zero) so positive numbers become larger and negative numbers become smaller (i.e. more negative).

Excel INT Function

The Excel INT function returns the integer part of a decimal number by rounding down to the integer. Note the INT function rounds down, so negative numbers become more negative. For example, while INT(10.8) returns 10, INT(-10.8) returns -11.

Excel TRUNC Function

The Excel TRUNC function returns a truncated number based on an (optional) number of digits. For example, TRUNC(4.9) will return 4, and TRUNC(-3.5) will return -3. The TRUNC function does no rounding, it simply truncates as specified.

Good links

Microsoft ROUNDDOWN function documentation

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