Decimal Rounding Calculator
A decimal rounding calculator that rounds numbers to a chosen number of decimal places or significant figures, with several rounding modes. Results update as you type.
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What this tool does
Reducing a number to a target precision using a rounding rule. This decimal rounding calculator is free, works on desktop and mobile, and requires no sign-up.
Also useful for: rounded to 1 decimal place, rounded to one decimal place.
Features
- Round to decimal places or significant figures
- Half-up, half-even and truncate modes
- Live output
- Copy support
How to use it
- Enter a number and precision
- Choose a rounding mode
- Read the rounded value
Examples
Two places
3.14159 → 2 dp3.14 Common uses
- Financial rounding
- Presenting measurements
- Cleaning up computed values
Good to know
- Bound by double-precision arithmetic for very long inputs
Frequently asked questions
What is banker’s rounding?
Half-even rounding rounds a tie to the nearest even digit, reducing cumulative bias.