Significant Figures Calculator

Round a number to a specified number of significant figures.

Calculator

Enter Your Numbers

Enter the number you want to round

Enter the number of significant figures

Table of Contents

1 Rules for Significant Figures
2 How to Count Significant Figures
3 Significant Figures - Practical Examples
Rules

Rules for Significant Figures

The rules for determining significant figures are:

  1. 1
    All non-zero digits are significant
  2. 2
    Zeros between non-zero digits are significant
  3. 3
    Leading zeros are not significant
  4. 4
    Trailing zeros in a decimal number are significant
Steps

How to Count Significant Figures

To count significant figures in a number:

  1. 1
    Start counting from the first non-zero digit
  2. 2
    Count all digits until the end of the number
  3. 3
    For decimal numbers, count trailing zeros

For example, in the number 0.004500:

Example:
0.004500 has 4 significant figures (4, 5, 0, 0)
Examples

Significant Figures - Practical Examples

Example 1 Basic Number

Round 123.456 to 3 significant figures.

Result: 123

Example 2 Decimal Number

Round 0.004567 to 2 significant figures.

Result: 0.0046

Example 3 Large Number

Round 1234567 to 4 significant figures.

Result: 1235000

Tools

Mathematics Calculators

Fraction To Percent Harmonic Mean Percent To Fraction Percent To Decimal Percentage Decrease

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