Significant Figures Calculator
Round a number to a given number of significant figures.
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Introduction
Significant Figures Calculator — Round a number to a given number of significant figures. Enter Number, Significant figures to get an instant, accurate result.
Formula
Determines the order of magnitude of the number (via log₁₀), then rounds it so it retains exactly the requested number of significant figures.
Step-by-step
- Enter the Number.
- Enter the Significant figures.
- Click Calculate to see your result instantly.
Real-world example
Example: With Number = 123456, Significant figures = 3, the Significant Figures Calculator gives Result: 123000.
Frequently Asked Questions
What counts as a significant figure?
All non-zero digits, any zeros between them, and trailing zeros after a decimal point.
What happens if I enter 0?
Zero has no order of magnitude, so the result is simply reported as 0.
What inputs does the Significant Figures Calculator need?
You'll need to provide: Number, Significant figures. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Significant Figures Calculator?
The Significant Figures Calculator applies the formula exactly as calculated — Determines the order of magnitude of the number (via log₁₀), then rounds it so it retains exactly the requested number of significant figures. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Significant Figures Calculator free to use?
Yes, the Significant Figures Calculator is completely free, requires no signup, and runs instantly in your browser.
About the Significant Figures Calculator
The Significant Figures Calculator uses a real, verifiable formula — Determines the order of magnitude of the number (via log₁₀), then rounds it so it retains exactly the requested number of significant figures. — so results are accurate every time, not an approximation.