Significant Figures Calculator

Round a number to a number of significant figures.

Rounded 3.14

Formula: round to N significant digits

Step-by-step with your numbers:

1. Values used:

2. Number = 3.142

3. Significant figures = 3

5. Rounded = 3.14

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Round a value to a set number of significant figures.

The math behind it

Significant figures count meaningful digits, starting from the first non-zero digit.

3.14159 to 3 sig figs → 3.14.

Trailing zeros?

They can be significant depending on notation; this uses standard precision rounding.