Significant Figures Calculator
Last updated: July 2026
Round a number to a chosen number of significant figures and show scientific notation.
Rounded number
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- Scientific notation: —
- Order of magnitude: —
- Absolute rounding difference: —
On this page
Quick summary: Round a number to a chosen number of significant figures and show scientific notation. Enter the values, calculate, review the result, and compare another realistic scenario when useful.
Read the complete guide
What this calculator estimates
Round a number to a chosen number of significant figures and show scientific notation. The calculation runs locally in your browser and is intended for quick reference and comparison.
How to use it
Enter the requested values, select Calculate, review the headline result and supporting figures, then change one input at a time to compare another scenario.
How the calculation works
Find the number’s order of magnitude, then round so the requested count of meaningful digits remains.
Important limitations
Extremely large or small values are limited by JavaScript number precision.
Frequently asked questions
Is the result exact?
The calculator follows the stated formula and rounds only for display. Results can still depend on the quality and meaning of the values you enter.
Can I compare different scenarios?
Yes. Change one input at a time to see how it affects the result.
Does the calculator store my inputs?
The calculation runs in your browser and does not require an account. Avoid entering unnecessary confidential information.