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Significant Figures Rounding Calculator

Round a finite number to a chosen number of significant figures.

Your inputs

Your result

Enter your information and select Calculate to see the result.

How this calculator works

The first non-zero digit starts the significant-figure count; later digits determine rounding.

Change one assumption at a time to see which inputs have the greatest effect on the estimate.

Worked example

12.345 rounded to three significant figures is 12.3.

Limitations

This calculator is for educational use; verify important work independently.

Review this educational estimate against current quotes, official information, and your own budget before making a financial decision.