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Significant Figures Calculator

Round results to correct significant figures with rule explanations — 0.00450 has 3. Stop overstating lab precision — free, local, no signup.

100% Local Browser Native

How to Use the Significant Figures Calculator

1. Enter value or expression

Lab measurements to round.

2. Read sig figs

Count with rule cited.

3. Apply operation rules

Per-operation precision honored.

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Frequently Asked Questions

How many sig figs in 0.00450?

Three (4, 5, 0) — leading zeros never count, trailing zeros after decimal always do. The tool annotates each digit's status.

Operations rules?

Multiply/divide: fewest sig figs wins. Add/subtract: fewest decimal places wins. Different rules per operation — the classic exam trap.

Exact numbers?

Counts and definitions (12 inches/foot) carry infinite precision — they never limit results. Measured values alone constrain.

Do lab values upload?

No — math runs locally in your browser. Numbers never leave your device.

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Last updated October 2026