What is the Significant Figures Calculator?
Round a number to a chosen number of significant figures. From percentages and fractions to logarithms and quadratic equations, these math calculators show exact results — using arbitrary-precision integers wherever whole-number answers can get very large.
How to use the Significant Figures Calculator
- Enter your number, your significant figures.
- Results update automatically as you type; you can also press Calculate.
- Read the output: rounded, scientific form.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With number = 0.0045678, significant figures = 3, the Significant Figures Calculator returns rounded: 0.00457; scientific form: 4.57e-3.
Tips for better results
- Use the formula section on each page to check your homework method, not just the answer.
- For very large factorials, combinations and base conversions we use exact big-integer math.
- Floating-point results are rounded to 12 significant digits to remove binary noise.
Frequently asked questions
What does the Significant Figures Calculator do?
Round a number to a chosen number of significant figures.
How is it calculated?
The Significant Figures Calculator uses this method: Keep the first n non-zero-leading digits, then round.
Can you show an example?
With number = 0.0045678, significant figures = 3, the Significant Figures Calculator returns rounded: 0.00457; scientific form: 4.57e-3.
Is the Significant Figures Calculator accurate?
Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.
Is this tool free and private?
Yes — the Significant Figures Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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