Round a number to any number of decimal places, with standard rounding plus round-up (ceiling) and round-down (floor) shown alongside.
How it works
- Type your full decimal number.
- Specify the amount of decimal places to round to.
- View the standard rounding, the ceiling, and the floor outputs.
Frequently asked questions
What is "round half up"?
When the digit is exactly 5, the value rounds up. Some fields use "round half to even" (banker's rounding) instead; this tool uses half up.
Can I round to tens or hundreds?
Yes — use negative decimal places: -1 rounds to the nearest ten, -2 to the nearest hundred.
Ceiling vs floor?
Ceiling always rounds up, floor always rounds down, regardless of the digit.
What is banker's rounding?
Also called round-half-to-even, it rounds 0.5 to the nearest even number (2.5 → 2, 3.5 → 4) to reduce cumulative bias in financial calculations.
How does rounding affect financial calculations?
Small rounding differences compound in repeated operations. That is why financial software typically uses exact decimal arithmetic or rounds only at the final display step, not at intermediate steps.