How to Use the Rounding Calculator
The Rounding Calculator shows ceiling, floor, rounding, and truncation results for any number at a selected precision level β all at once. This lets you compare the four main rounding methods side by side, which is useful for financial calculations, programming, statistics, and everyday math.
Choose a decimal precision from whole number up to 4 decimal places, or even round to the tens, hundreds, or thousands place. Enter any number and the four results appear instantly.
Rounding Methods Explained
Ceiling: always rounds up. Floor: always rounds toward ββ. Round: rounds to nearest (β₯ 0.5 up, < 0.5 down). Truncate: drops the extra digits toward 0. Example: 2.7 β ceil 3, floor 2, round 3, truncate 2. For β2.7 β ceil β2, floor β3, round β3, truncate β2.
Frequently Asked Questions
Floor rounds toward ββ, while truncate rounds toward 0. For β2.7, floor = β3 but truncate = β2.
Select "Hundreds place." Example: 12,345 rounded to the nearest hundred = 12,300.
JavaScript floating-point arithmetic may introduce tiny errors, but results are accurate within the displayed decimal places.