Rounding calculator
Calculator
The calculator needs JavaScript. The tables below give the same numbers for common cases.
How it is worked out
- Look at the digit just after the place you are rounding to.
- If it is 5 or more, round up (away from zero); if it is 4 or less, round down. Result: 3.14.
| Inputs | Answer |
|---|---|
| Number: 3.14159; Round to: 2 decimal places | 3.14159 rounded to 2 decimal places is 3.14. |
| Number: 2.5; Round to: Nearest whole number | 2.5 rounded to the nearest whole number is 3. |
| Number: 1250; Round to: Nearest 100 | 1,250 rounded to the nearest 100 is 1,300. |
| Number: 0.0456; Round to: 3 decimal places | 0.0456 rounded to 3 decimal places is 0.046. |
How to use it
To round, look at the digit just after the place you are rounding to: 5 or more rounds up, 4 or less rounds down. 3.14159 to 2 decimal places is 3.14 (the next digit is 1). 1,250 to the nearest 100 is 1,300.
This calculator rounds halves away from zero (2.5 becomes 3 and −2.5 becomes −3), the convention taught in schools. Some software uses banker's rounding instead, which sends halves to the nearest even number.
Frequently asked questions
How do I round to 2 decimal places?
Keep two digits after the point; raise the last one by 1 if the next digit is 5 or more.
What is 2.5 rounded to a whole number?
3 with the round-half-up rule.
How do I round to the nearest hundred?
Look at the tens digit: 50 or more rounds up, under 50 rounds down.
Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.
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General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.