Sig Fig Calculator (with Steps)

Count, Round, and Perform Mixed Operations with Precision

Instantly count significant figures and perform mixed operations (+, −, ×, ÷) with automatic rule application. Unlike basic calculators, our Sig Fig Calculator shows you the "why" behind every step.

🧮 Perform Your Calculation

Mode	Input Your Values / Expression
Simple Count	[ 0.00450 ]
Mixed Operation	[ (12.5 + 1.23) / 0.50 ]
Rounding To	[ 3 ] Sig Figs

Result: 27 Steps: > 1. Add (12.5 + 1.23) = 13.73. Rule: Round to the least decimal place (tenths) → 13.7. 2. Divide 13.7 by 0.50. Rule: Round to the least total sig figs (two) → 27.

🔍 How to Use This Significant Figures Calculator

Enter Your Expression: Type a single number or a complex math problem.
Follow the Rules: The tool automatically identifies which zeros are significant (leading vs. trailing).
View the Steps: Click "Show Steps" to see the intermediate rounding logic for addition, subtraction, multiplication, and division.

📝 The Golden Rules of Sig Figs

Our calculator follows the standard scientific rounding rules:

Rule Type	Description	Example
Non-Zero Digits	Always significant.	45 (2 sig figs)
Leading Zeros	Never significant.	0.004 (1 sig fig)
Captive Zeros	Always significant.	405 (3 sig figs)
Trailing Zeros	Significant only if there is a decimal point.	45.00 (4 sig figs) vs 450 (2 sig figs)

🎓 Perfect for Chemistry & Physics Students

Why waste time manually checking rounding rules when you can verify your homework in seconds? Whether you are dealing with Scientific Notation ($4.5 \times 10^3$) or Complex Multi-step Equations, our tool handles the precision for you.

Accuracy: Verified against standard STEM textbook logic.
Step-by-Step: Learn the rules while you calculate.
Mixed Operations: Handles the different rules for (+/-) and (*/÷) in one go.

Looking for more science tools? Check out our Scientific Notation Converter or Density Calculator.