Everyday tool
Rounding and Significant Figures Calculator
Enter a number, choose decimal places or significant figures, then select a rounding rule.
Runs in your browser. No upload.
Values are processed locally in this browser.
Result
About this tool
Rounding and Significant Figures Calculator made simple.
Half-up and half-even rounding are applied to the entered decimal text. Scientific notation is accepted; output is not a binary floating-point guess.
Common questions
About Rounding and Significant Figures Calculator.
How do I use Rounding calculator?
Enter a number, choose decimal places or significant figures, then select a rounding rule.
Is my data uploaded to a server?
No. This tool runs locally in your browser. Your input is not uploaded.