Significant Figures Calculator

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Count the significant figures in any number and round values to a chosen number of sig figs, with the rules explained.

Number

Round to significant figures (optional)

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Runs entirely in your browser. No data is sent to any server.

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update v1.0

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Type a number (decimals and scientific notation supported) to count its significant figures. Enter a sig-fig count to round it.

Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.