Number Rounding Tool
Round numbers by decimal places or significant figures with half-up, banker’s, floor, ceil, truncation, and step rounding—complete with comparison tables.
Supports scientific notation and negative values. We keep the original precision internally, so changing modes never loses accuracy.
Decimal places
Choose how many digits to keep after the decimal point.
Round to the nearest multiple of this value (for example 0.05 for currency, or 5 for rounding to the nearest five).
Traditional rounding, halves go away from zero
Halves round to the nearest even digit
Towards -∞ and +∞ respectively
Cuts off digits without rounding
Adjustable step rounding
Quick adjustments to step boundaries
Preview across decimal places
Compare how the number behaves as you change the number of decimal places. Banker's rounding is especially handy for financial calculations.
| Places | Half up | Banker's | Floor | Ceil |
|---|---|---|---|---|
| 0 | 3 | 3 | 3 | 4 |
| 1 | 3.1 | 3.1 | 3.1 | 3.2 |
| 2 | 3.14 | 3.14 | 3.14 | 3.15 |
| 3 | 3.142 | 3.142 | 3.141 | 3.142 |
| 4 | 3.1416 | 3.1416 | 3.1415 | 3.1416 |
| 5 | 3.14159 | 3.14159 | 3.14159 | 3.14159 |
| 6 | 3.14159 | 3.14159 | 3.14159 | 3.14159 |