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有効数字計算機
明示されたゼロの扱いに基づき有効数字を数え、小数桁を明示的な科学的記数法に丸めます。
ツール操作エリア
アカウント不要The calculation runs locally using browser APIs; it does not require uploading measurements. Optional analytics and advertising have separate consent and privacy disclosures. Avoid sensitive inputs.
- Input significant figures (stated convention)
- 4
- Rounded scientific notation
- 4.56e-3
Plain-integer trailing zeros are treated as non-significant unless a decimal point or exponent is present. For zero, decimal places indicate precision (minimum one figure). Rounds decimal digits half away from zero and uses scientific notation to make precision explicit.