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Significant Figures Calculator

Enter a number in this sig fig calculator to count significant figures, equivalent Scientific and E notations.

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Significant Figures (Sig Fig) Calculator

Use our Significant Figures Calculator to quickly determine the number of meaningful digits in any number. This tool helps you identify significant and non-significant digits and provides equivalent scientific and E notation for precision in calculations and reporting.

What Are Significant Figures?

Significant figures (sig figs) are the digits in a number that convey its precision. They include all certain digits and the first uncertain digit, helping indicate the accuracy of measurements or calculations.

Rules for Counting Significant Figures

To identify significant figures, apply the following rules:

Rule #1: All non-zero digits are significant.

Example: 3.482 → 4 sig figs
Example: 769 → 3 sig figs

Rule #2: Zeros between non-zero digits are significant.

Example: 5007 → 4 sig figs
Example: 10203 → 5 sig figs

Rule #3: Leading zeros are not significant; trailing zeros after a decimal point are significant.

Example: 0.00789 → 3 sig figs
Example: 0.00420 → 3 sig figs

How to Identify Significant Figures?

All non-zero digits (e.g., 1, 2, 5, 9)
Zeros between non-zero digits (e.g., 404, 50.07)
Trailing zeros with a decimal point (e.g., 0.5600, 120.0)

Here’s a table with examples of numbers, their scientific notation, and their sig figs:

Number	Scientific Notation	Significant Figures
0.00052	5.2×10^-4	2
700	7×10²	1
45.60	4.560×10¹	4
0.00730	7.30×10^-3	3
6.022×10²³	6.022×10²³	4
120.00	1.2000×10²	5

Using the Sig Fig Calculator

This tool works for individual numbers, multiple numbers, or expressions. You can also round results to a specific number of significant figures.

Steps:

Enter a number or mathematical expression.
Choose the rounding precision (optional).
Click “Calculate” to get results.

Outputs Include:

Rounded value to the selected sig figs
Total number of significant figures
Decimal places
Scientific (E) notation
Standardized scientific notation

FAQs

How many significant figures are in 0.0098?

0.0098 has 2 significant figures. Leading zeros are not counted.

Does 5000 have 1 or 4 significant figures?

5000 has 1 significant figure unless written with a decimal point or in scientific notation (e.g., 5.000×10³ has 4 sig figs).

References

Wikipedia: Significant Figures – Overview of rules, rounding, and scientific notation.
Chemguide: Significant Figures – Detailed explanations with examples.

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