Choose a rounding rule and see the changed value and the digit-based reasoning.
Calculate with the Rounding Calculator
Enter the values below. Invalid mathematical operations are explained before a result is shown.
Rounding Calculator results
Parabola graph
How to use the Rounding Calculator
- Choose a calculation mode when one is available.
- Enter the required values using the examples and field notes as a guide.
- Select Calculate or press Enter.
- Review the primary result, supporting values, and working.
Worked example
12.345 rounded to two decimal places is 12.35 using half-up rounding.
Assumptions
The calculator uses real-number arithmetic unless complex square or quadratic roots are explicitly shown. Decimal displays can be rounded while calculations retain normal browser numeric precision.
Limitations
- Binary floating-point values are corrected with a small tolerance where practical.
- Precision is limited to 15 digits.
Frequently asked questions
Does the Rounding Calculator accept decimals and negative values?
It accepts them wherever the selected operation permits. Invalid domains are identified before a result is shown.
How are decimal results rounded?
Calculations retain JavaScript numeric precision and display a readable number of significant digits. A displayed decimal may therefore be rounded.
Are entries stored?
No. The calculation runs in your browser and this page does not store the values you enter.