About the rounding calculator
Rounding simplifies numbers while keeping them close to the original. This calculator avoids common floating-point surprises (like 1.005 rounding to 1.00) and shows nearest, up, and down side by side.
How to use this calculator
- Enter a number.
- Choose the place to round to.
- Choose nearest, up, or down.
Worked examples
- The third decimal is 1, so round down
3.14.
Measurement guidance
Rounding money
For currency, round to 2 decimal places, and round only the final total when possible.
Frequently asked questions
What happens with exactly half, like 2.5?
Nearest rounds half away from zero: 2.5 → 3 and −2.5 → −3.
What is banker’s rounding?
A method that rounds halves to the nearest even number; this calculator uses the more common half-away-from-zero rule.