ROUNDDOWN Google Sheet Formula
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ROUNDDOWN Formula Syntax
Example Use Case
Rounding a number down to a specified decimal place for conservative estimates
Understanding the ROUNDDOWN Formula
The ROUNDDOWN function in Excel forces a number down to a specified number of decimal places, always truncating toward zero regardless of value. It’s a conservative rounding tool, great for ensuring numbers don’t overshoot in budgets or measurements.
ROUNDDOWN(3.14159, 2) returns 3.14, ignoring the 0.00159. It takes two arguments: the number and digits, mirroring ROUND but with a downward bias—similar to FLOOR but with decimal flexibility.
Why Use ROUNDDOWN?
ROUNDDOWN keeps values low—think safety margins, cost estimates, or data truncation. Its predictable downward rounding ensures you stay under limits, offering precision without exaggeration.
Example with Sample Data
| Number, Digits | Formula | Result |
|---|---|---|
| 3.14159, 2 | =ROUNDDOWN(3.14159, 2) | 3.14 |
| 5.678, 1 | =ROUNDDOWN(5.678, 1) | 5.6 |
| -2.345, 0 | =ROUNDDOWN(-2.345, 0) | -2 |
ROUNDDOWN cuts down: 5.678 to 5.6, -2.345 to -2. It’s a cautious rounder.
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