Calculators

Rounding

Round a number to a chosen number of decimal places and also see it at three significant figures. Trailing zeros are trimmed for a clean result.

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Rounded: 3.14 · 3 sig figs: 3.14

Worked on the example above, step by step — follow along and you can do it on paper next time, no tool required.

Rounding to d decimals keeps d digits after the point, bumping the last kept digit up when the next digit is 5 or more.
Keep the chosen number of decimals
3.141593 → 3.14 (to 2 dp)

What is 3.14159 to 2 decimals?

3.14, and at three significant figures it's also 3.14.

What's the difference from sig figs?

Decimals count places after the point; significant figures count meaningful digits from the first non-zero.