About the Rounding Calculator
Round any number to decimal places, a multiple such as the nearest 10 or 0.05, or a number of significant figures, using the rounding rule you need, including banker's rounding.
Key features
- Round to 0–4 decimal places
- Round to the nearest 10, 100, 1,000, 0.05, 0.25 or 0.5
- Round to 2, 3 or 4 significant figures
- Five rounding rules, including banker's rounding
- Avoids floating-point surprises (1.005 → 1.01)
- Shows the rounding difference
Round numbers the right way
Rounding seems simple until it isn't: half values, negative numbers, money, scientific data and binary floating-point all have gotchas. This calculator rounds to decimal places, multiples or significant figures with the rounding rule you need.
Rounding rules compared
| Value | Half up | Half to even | Up (ceiling) | Down (floor) | Truncate |
|---|---|---|---|---|---|
| 2.5 | 3 | 2 | 3 | 2 | 2 |
| 3.5 | 4 | 4 | 4 | 3 | 3 |
| −2.5 | −3 | −2 | −2 | −3 | −2 |
| 2.4 | 2 | 2 | 3 | 2 | 2 |
Rounding to a multiple
| Value | Nearest 10 | Nearest 100 | Nearest 0.05 | Nearest 0.25 |
|---|---|---|---|---|
| 1,234.5678 | 1,230 | 1,200 | 1,234.55 | 1,234.5 |
| 7.375 | 10 | 0 | 7.4 | 7.5 |
Rounding to 0.05 is common for cash prices in countries without 1-cent coins; 0.25 is common for time tracking (quarter hours).
When to use which
- Money and invoices: 2 decimal places, half up (or banker's, if your accounting system uses it).
- Statistics and science: significant figures matching your measurement precision.
- Estimates: nearest 10, 100 or 1,000.
- Pricing, packaging and billing: always round up (ceiling).
Related calculators
Need a quick calculation first? Use the Scientific Calculator. Working with percentages? Try the Percentage Calculator.
How to use the Rounding Calculator
- Enter your numbers in the fields above. Units and options can be changed at any time.
- The result updates instantly as you type; there's no calculate button to press.
- Check the breakdown under the main result for the details behind the number.
- Adjust the inputs to compare scenarios, for example a different rate or term.