Free ROUNDDOWN Formula Generator — Round Down in Excel
Rounds a number down, toward zero.
Common Errors & Fixes
Number not rounding down as expected
Causes:- Using ROUNDDOWN on positive num_digits but the value is already below the threshold.
- Applying to negatives — -1.5 rounddown to 0 decimals gives -1 (toward zero).
Fixes:- Test with a simple value first to verify the direction.
- Remember: ROUNDDOWN always goes toward zero regardless of sign.
Frequently Asked Questions
When should I use ROUNDDOWN?
Use ROUNDDOWN when you need to truncate values without rounding up, such as calculating whole units, integer payouts, or conservative estimates.
Does ROUNDDOWN just drop extra digits?
Yes. ROUNDDOWN truncates toward zero — it simply discards digits beyond the specified decimal places without any rounding.
Is ROUNDDOWN the same as TRUNC?
For positive numbers and default num_digits, yes, ROUNDDOWN and TRUNC behave identically. For negative numbers, TRUNC still truncates toward zero while ROUNDDOWN always rounds toward zero.
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