Formula and calculation method
Scale by 10^places, round to the nearest integer, and scale back.
JavaScript decimal rounding uses binary floating-point and ties toward positive infinity. It is not financial decimal arithmetic.
How to use rounding calculator
- Set Number. The example below uses 123.456.
- Set Decimal places. The example below uses 2.
- Select Calculate to update the result. Reset restores the illustrated inputs. Copy, print or download your own result if you need a record.
Worked example
Example inputs
- Number
- 123.456
- Decimal places
- 2
- Rounded
- 123.46
- Rounded down
- 123.45
- Rounded up
- 123.46
Factors affecting your result
JavaScript decimal rounding uses binary floating-point and ties toward positive infinity. It is not financial decimal arithmetic.
Changing number changes the scenario being evaluated. Adjust one input at a time when comparing results, keep a copy of the assumptions, and compare values using the same unit and period. A precise arithmetic result does not make an uncertain assumption precise.
Frequently asked questions
How does the rounding calculator work?
Scale by 10^places, round to the nearest integer, and scale back.
What inputs does Rounding Calculator need?
Enter number, decimal places. Choose values that correspond to the same situation and measurement convention.
How should I interpret the rounding calculator result?
JavaScript decimal rounding uses binary floating-point and ties toward positive infinity. It is not financial decimal arithmetic.
Are my rounding calculator inputs uploaded?
No. The calculation runs in this browser. Favorites, recent tool names, theme and formatting preferences may be saved locally, but calculation inputs are not sent to a calculation server or stored by this website. Shared links do not include entered values.
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