How to use this calculator
Round a number to decimal places, significant figures, or common nearest-place values.
How the calculation works
- Enter the number.
- Choose decimal places or significant figures.
- The rounded result is displayed.
Formula
Decimal rounding uses a power-of-ten scale before applying Math.round.
Example
3.14159 rounded to 2 decimal places is 3.14.
Understanding your result
Use the output as a practical starting point, then review it before using it in an important workflow.
Assumptions and limitations
- Rounding is for display and planning.
- Very precise financial rounding rules can vary by context.
Frequently asked questions
Does this require an account?
No. The core tool works without creating a Tool2Do account.
Is my input included in share links or analytics?
No. Tool2Do share actions use the tool page URL and safe metadata, not private values or uploaded files.