Factorial Calculator
Factorial of n.
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Significant Figures Calculator
Count the significant figures in a number and round to any number of them.
Significant figures
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In your number.
| Rounded | — |
|---|---|
| Scientific notation | — |
| Number | — |
| — |
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Enter your figures above to see the step-by-step working.
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How the Significant Figures Calculator Works
Significant figures are the digits in a number that carry real precision. The rules: all non-zero digits count; zeros between them count; leading zeros never count; and trailing zeros count only when there’s a decimal point. So 0.00340 has three significant figures (3, 4 and the final 0), while 1200 has just two unless written as 1200.
This calculator counts the significant figures in your number and rounds it to however many you choose, showing the result and its scientific-notation form.
count non-zero digits, interior zeros, and trailing zeros after a decimal point
Frequently Asked Questions
What are significant figures?
The digits in a measurement that carry meaningful precision — all non-zero digits, zeros between them, and trailing zeros after a decimal point.
How many sig figs does 0.00340 have?
Three — the leading zeros don’t count, but the 3, 4 and the trailing 0 do.
Do trailing zeros count?
Only when there’s a decimal point. “1200” has two sig figs; “1200.” or “1200.0” has four or five.
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