How does the ROUNDDOWN function (DAX) work?

The ROUNDDOWN function (DAX) rounds a number down, toward zero.

ROUNDDOWN Formula Syntax

ROUNDDOWN(
     <number>, <num_digits>
)

How do you use the ROUNDDOWN function?

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.

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Considerations when using the ROUNDDOWN function

If num_digits is greater than 0 (zero), then the value in number is rounded down to the specified number of decimal places.

If num_digits is 0, then the value in number is rounded down to the nearest integer.

If num_digits is less than 0, then the value in number is rounded down to the left of the decimal point.

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Formula examples using the ROUNDDOWN function

=ROUNDDOWN(3.14159,3)

=ROUNDDOWN(31415.92654, -2)

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