Significant Figures Calculator
Use this significant figures calculator to round a number to the significant figures you choose. Enter the number and the required number of significant figures and review the rounded value and the digits that carry meaning.
Significant figures
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Rounded —
Scientific notation —
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How it works
Rules: non-zero digits count; zeros between digits count; leading zeros never count; trailing zeros count only with a decimal pointHow to use the Significant Figures Calculator
Start by entering the number and the required number of significant figures. Keep the units consistent and check that each value belongs to the same question.
The result gives the rounded value and the digits that carry meaning. Zeros can be significant or only place holders depending on their position. Use it as a guide and check any instructions, rules or professional advice that apply.
Frequently Asked Questions
What does this significant figures calculator calculate?
It gives the rounded value and the digits that carry meaning. Zeros can be significant or only place holders depending on their position.
What information should I enter?
Enter the number and the required number of significant figures. Use the same units throughout so the result is easier to understand.
Why did the zeros change?
The calculator keeps the requested number of meaningful digits while preserving the value as closely as possible.