Percent Error Calculator
Calculate percent error, absolute error, and relative error between experimental and theoretical values. Perfect for lab reports, quality control, and data analysis.
Step 1: Enter Values
Percent Error Formula
Percent Error = |(Experimental – Theoretical) / Theoretical| × 100%
Step 2: Options & Examples
Interpretation
• Percent error near 0% indicates high accuracy.
• <5% often acceptable in many sciences.
• >10% may suggest systematic error.
Percent Error Results
Percent Error
Common Error Thresholds
| Threshold | Description | Your Error |
|---|
Percent Error Formula
Percent Error = |(Experimental – Theoretical) / Theoretical| × 100%
Where:
• Theoretical = accepted or true value
• Experimental = measured or observed value
• |…| = absolute value (always positive)
Related:
• Absolute Error = |Experimental – Theoretical|
• Relative Error = |Experimental – Theoretical| / |Theoretical|
Example Calculation
Example: Lab Measurement
Theoretical value (accepted): 100
Experimental value (measured): 105
Calculation:
Absolute error = |105 – 100| = 5
Relative error = 5 / 100 = 0.05
Percent error = 0.05 × 100% = 5.00%
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