Rounding calculator
Round a number to decimal places, tens or significant figures.
About this calculator
This rounding calculator rounds a number to the place you choose: whole numbers, decimal places, tens, hundreds, thousands or significant figures.
Pick the rounding method too, from everyday half-up rounding to banker's rounding, ceiling, floor or truncation.
How it works
Rounding keeps the digits up to the place you choose and looks at the next one. With half up, 5 or more rounds up. Banker’s rounding sends an exact half to the nearest even digit, so 2.5 becomes 2 and 3.5 becomes 4.
Last reviewed:
Worked example
- Number: 1,234.5678
- Round to: 2 decimal places
- Method: Half up (school rounding)
Rounded: 1,234.57
Common questions
How do I round to 2 decimal places?
Look at the third decimal place. If it's 5 or more, round the second one up. So 3.14159 becomes 3.14, and 2.675 becomes 2.68.
What are significant figures?
The digits that carry meaning, starting from the first non-zero digit. 0.004520 has four: 4, 5, 2 and the final 0.
What is banker's rounding?
Rounding an exact half to the nearest even number. It avoids a small upward bias when many numbers are rounded, which is why it's used in finance and computing.
The story behind it
Where the idea came from: Banker's rounding is the default in the IEEE 754 standard for computer arithmetic, because it avoids a steady upward drift.
Rounding every half up adds a tiny bias that grows over millions of sums. Rounding halves to even cancels it out. Most of the time, though, the school rule of rounding 5 up is exactly what you want.
Why you can trust this calculator
- It runs in your browser. Nothing you type into it is sent anywhere.
- The method is explained on this page, so you can check it yourself.
- Free to use, with no sign-up.
- Results are estimates, so please double-check anything important.
- Spotted a mistake? Tell us and we'll look into it.
After 15 years as a mathematics educator, I built CalculStore to give students, teachers, professionals and anyone working with numbers simple, reliable tools.
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