Significant Figures Calculator

Significant Figures Rules:

Non-zero digits are always significant
Zeros between non-zero digits are significant
Leading zeros are never significant
Trailing zeros are significant if after a decimal

Number of Significant Figures:

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is a Significant Figures Calculator?

Definition: This calculator counts the number of significant figures in a given number.

Purpose: It helps students, scientists, and engineers determine the precision of numerical values in calculations and measurements.

2. How Does the Calculator Work?

The calculator follows standard rules for determining significant figures:

All non-zero digits are significant (1-9)
Zeros between non-zero digits are significant (e.g., 101 has 3 sig figs)
Leading zeros are never significant (e.g., 0.005 has 1 sig fig)
Trailing zeros are significant only if the number contains a decimal point (e.g., 100. has 3 sig figs, 100 has 1 sig fig)

3. Importance of Significant Figures

Details: Significant figures indicate the precision of a measurement or calculation. Proper use ensures accurate representation of data and prevents overstating precision.

4. Using the Calculator

Tips: Enter any number (including decimals and scientific notation). The calculator will automatically determine the number of significant figures.

5. Frequently Asked Questions (FAQ)

Q1: How are zeros handled in significant figures?
A: Zeros may or may not be significant depending on their position (see rules above).

Q2: Does scientific notation affect significant figures?
A: No, scientific notation only changes how the number is written, not its significant figures.

Q3: How many sig figs does 0.00450 have?
A: Three (the 4, 5, and the trailing zero after the decimal).

Q4: What about exact numbers?
A: Exact numbers (like counted quantities) have infinite significant figures.

Q5: How are sig figs used in calculations?
A: The result should have the same number of sig figs as the least precise measurement used.