Significant Figures Calculator

Calculate the number of significant figures in a number or round numbers to a specific number of significant figures. Perfect for chemistry, physics, and other scientific calculations.

How to Use This Calculator

This calculator has two modes:

Count Significant Figures: Enter any number to find out how many significant figures it contains.
Round to Significant Figures: Enter a number and specify how many significant figures you want to round it to.

Remember these rules for significant figures:

All non-zero digits are significant
Zeros between non-zero digits are significant
Leading zeros are not significant
Trailing zeros after a decimal point are significant
Trailing zeros in a whole number are not significant unless explicitly shown with a decimal point

Understanding Significant Figures

Significant figures (also known as significant digits) are the digits in a number that carry meaningful value. They are crucial in scientific measurements and calculations as they indicate the precision of a measured or calculated value.

The concept of significant figures is important in:

Laboratory measurements and experiments
Scientific calculations and data analysis
Engineering precision requirements
Chemistry and physics calculations
Quality control and measurement standards