关于本计算器
Count significant figures of any number and round it to 1–15 significant digits, with exponential form shown.
有效数字计算器
数有效数字并按位修约。
输入计算参数
计算结果摘要
有效数字4
舍入值0.00456
E 记数法4.56e-3
常见问题
Which zeros count?
Leading zeros never count; trailing zeros count only after a decimal point.
How is rounding done?
To N significant digits via standard half-up rounding of the normalized mantissa.
Scientific notation input?
Yes — mantissas like 1.50e3 keep their written precision.