How to use the Rounding Calculator
The rounding calculator rounds a number to a chosen number of decimal places using different methods.
Open the Rounding Calculator →
What you need to enter
- Number
- Decimal places
- Method
The formula
Round half up, floor, ceiling, truncate or round half to even (banker's rounding).
Worked example
Using the default values in the calculator:
- Number: 3.14159
- Decimal places: 2
- Method: Round half up
| Rounded | 3.14 |
| Significant figures (3) | 3.14 |
Tips for better results
- Round only at the end of a calculation.
- Banker's rounding reduces bias.
Common mistakes to avoid
- Rounding too early.
- Using the wrong method.