▣ CALCULATORS Updated July 25, 2026

Rounding Calculator

Round to decimals, significant figures, or steps.

Number
Decimal places
Significant figures
Round to nearest
Result
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How it works

Decimal rounding uses half-up rounding. Significant-figure rounding scales the value by a power of ten before rounding so trailing zeros are handled correctly.

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Frequently asked questions

What is half-up rounding?

A digit of 5 or more rounds away from zero, which is the convention taught in most schools.

How many significant figures should I use?

Match the precision of your least precise measurement, typically 3 or 4 in school science.

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