Significant Figures Calculator

Round a number to a given number of significant figures.

Fill in the fields below to calculate

Number

Round to N sig figs

Enter your values above to see the result.

Your Results

Sig Fig Rules

1. All non-zero digits are sig
2. Zeros between non-zero are sig
3. Trailing zeros after decimal are sig
4. Leading zeros are NOT sig

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About This Calculator

Round a number to a given number of significant figures.

Everything is worked out in your browser as you type, so your figures never leave your device.

Pro Tips

Results update as you type — change any field to see the effect immediately.

Check that every value uses the same unit before comparing results.

Use the copy button to paste the significant figures figures into a note or spreadsheet.

Nothing is sent to a server, so you can use this with private figures.