Free online significant figures calculator for students, teachers, and scientists. Solve expressions, count sig figs, apply rounding rules, and handle log/ln operations with precision.
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Our Significant Figures Calculator is the most comprehensive and accurate tool for counting significant figures, solving mathematical expressions, and applying proper rounding rules for scientific calculations. Perfect for students, teachers, scientists, and engineers who need precise measurements and calculations in chemistry, physics, biology, and engineering applications.
This free online calculator supports complex mathematical expressions including addition, subtraction, multiplication, division, exponentiation, logarithms (log, ln), and scientific notation. The tool automatically applies significant figure rules and provides educational explanations to help users understand the underlying principles of measurement precision and uncertainty.
Solve complex mathematical expressions with proper significant figure handling. Supports +, -, ×, ÷, ^, parentheses, log, ln, and scientific notation.
Automatically count significant figures following standard scientific rules. Handles leading zeros, trailing zeros, decimal points, and scientific notation correctly.
Automatically applies the addition/subtraction rule, rounding results to the least number of decimal places among the operands for precise calculations.
Includes comprehensive rules, examples, and step-by-step explanations to help students and professionals understand significant figure principles.
Perfect for chemistry lab calculations, physics problem solving, engineering measurements, and any scientific work requiring measurement precision.
Responsive design with interactive number pad, preset expressions, real-time validation, and one-click copy functionality for easy use on any device.
Master significant figures for homework, exams, and lab reports. Verify answers and understand the rules with step-by-step explanations.
Create examples, verify student work, and demonstrate significant figure concepts with real-time calculations and educational content.
Ensure measurement precision in research, lab work, and publications. Handle complex calculations with proper significant figure rules.
Type your mathematical expression using standard notation. Supported operations: +, -, ×, ÷, ^, log, ln, parentheses, and scientific notation (e.g., 1.23e-4).
Use the slider to set your desired number of significant figures. The calculator will automatically round results to maintain precision.
View the calculated result, significant figure count, and step-by-step explanation of how the rules were applied.
Problem: Calculate pH from [H⁺] = 2.5 × 10⁻⁴ M
Solution: pH = -log(2.5e-4) = 3.60 (2 sig figs from 2.5)
Problem: Mass = 12.34 g, Volume = 5.6 cm³
Solution: Density = 12.34 ÷ 5.6 = 2.2 g/cm³ (2 sig figs from 5.6)
Problem: Length = 12.5 m, Width = 8.75 m
Solution: Area = 12.5 × 8.75 = 109 m² (3 sig figs from 12.5)
Start using our professional significant figures calculator now. Perfect for students, teachers, scientists, and engineers!
Count all non-zero digits, zeros between non-zero digits, and trailing zeros when a decimal point is present. Leading zeros are not significant. For example: 0.0025 has 2 sig figs, 1.200 has 4 sig figs, and 100 has 1 sig fig.
When adding or subtracting, round the result to the least number of decimal places among all operands. For example: 12.34 + 1.2 + 0.567 = 14.1 (rounded to 1 decimal place).
For multiplication and division, the result should have the same number of significant figures as the operand with the fewest significant figures. For example: 2.5 × 3.147 = 7.9 (2 sig figs, limited by 2.5).
Yes! Enter scientific notation using 'e' format (e.g., 1.23e-4 for 1.23×10⁻⁴). The calculator correctly counts significant figures in the coefficient and handles the exponent appropriately.
Absolutely! This calculator is specifically designed for scientific applications including chemistry lab calculations, physics problem solving, engineering measurements, and any field requiring measurement precision and uncertainty analysis.