Significant figures calculator
Round a number to a chosen number of significant figures.
How to use this page
- Enter values or use the example in the form.
- Choose a mode or units where available.
- Read the result and check the calculation steps below.
What this page does not do: You choose output precision, not measurement accuracy. Calculations use floating-point arithmetic; boundary values may require checking.
Further reading
12345 to three significant figures is 1.23 × 10⁴. Leading zeros are not significant: 0.004567 to three figures is 0.00457. Trailing zeros in the result indicate the chosen precision.
Frequently asked questions
How is the result calculated?
12345 to three significant figures is 1.23 × 10⁴. Leading zeros are not significant: 0.004567 to three figures is 0.00457. Trailing zeros in the result indicate the chosen precision.
What are the limitations?
You choose output precision, not measurement accuracy. Calculations use floating-point arithmetic; boundary values may require checking.
See also
Arithmetic Mean
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Decimal to fraction calculator
Convert a terminating decimal into an exact reduced fraction.