Significant figure rounding

Round decimal text to a chosen significant-figure count, preserving trailing zeros and explaining ambiguous integer precision.

Your input

Outputs are cleared when the input changes.

Result

Enter your data or use the example, then run the tool.

Worked example

0.004956 rounded to 3 significant figures is 0.00496.

9.995 to 3 figures is 10.0 (1.00e+1); 1.20e3 explicitly has three significant figures.

Method

Parse decimal digits and exponent as text and round by the first discarded digit, without binary floating-point rounding.

Scientific notation keeps exactly the requested significant digits. Integer trailing-zero ambiguity is reported or resolved by your explicit choice.

Limits

Input at most 2,000 characters, exponent −10,000 to 10,000 and 1–100 requested figures. No arithmetic expressions.

This uses the stated half-up convention, not ties-to-even. Rounding formatting does not create measurement accuracy or determine uncertainty.

Sources

OpenStax: significant figures and rounding

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