Significant Figures Calculator

Q: What are significant figures?

The meaningful digits in a number that convey precision. Leading zeros are not significant; all non-zero digits and trailing zeros after the decimal are.

Q: How do you round to significant figures?

Count N significant digits from the first non-zero digit, then round the rest. The decimal point shifts accordingly.

Use our free significant figures calculator to round any number to a given number of significant figures (1-15). Shows the rounded result, the original digit count, and the rounding magnitude (power of 10).

Math

Number

Significant Figures

Formula

Round any number to a specified number of significant figures (sig figs). The result preserves the N most significant digits of the original number, adjusting decimal places as needed.

Round to N significant figures: keep N most significant digits

Percentage: The percentage value you want to apply

Number: The original number or value

Result: The calculated result

How It Works

1Enter a number.
2Enter the number of significant figures (1-15).
3Click Calculate.

Examples

π to 3 sig figs

1.3.14159 → 3 significant figures → 3.14 (4th digit 1 < 5)

Result: 3.14

299792458 to 3 sig figs

1.299,792,458 → 3 sig figs → 300,000,000

Result: 300000000

Frequently Asked Questions

The meaningful digits in a number that convey precision. Leading zeros are not significant; all non-zero digits and trailing zeros after the decimal are.

Count N significant digits from the first non-zero digit, then round the rest. The decimal point shifts accordingly.

1 to 15 significant figures.

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CalculateMe Team

Last updated: 2026-07-15

Significant Figures Calculator

Formula

How It Works

Examples

π to 3 sig figs

299792458 to 3 sig figs

Frequently Asked Questions

What are significant figures?

How do you round to significant figures?

What is the maximum number of sig figs?

Related Calculators

Significant Figures Calculator

Formula

How It Works

Examples

π to 3 sig figs

299792458 to 3 sig figs

Frequently Asked Questions

What are significant figures?

How do you round to significant figures?

What is the maximum number of sig figs?

Related Calculators