Percent Error Calculator — Lab Accuracy & Experimental Precision
Calculate percent error, absolute error, signed error, accuracy, and relative error between accepted and experimental values.
Percent Error
Results below
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Absolute Error
5
Signed Error (underestimate)
▼ 5% underestimate
Experimental Accuracy
▲ 95%
Relative Error
0.05
Formula Used
δ = |(100 - 95) / 100| x 100%
Scenario Comparison
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Percent Error
5%
Step-by-Step Calculation
Formula
δ = |vA − vE| ÷ |vA| × 100%
vA = 100 (accepted), vE = 95 (experimental)
Step 1: Calculate Absolute Error
|100 − 95| = 5
Step 2: Calculate Percent Error
(5 ÷ |100|) × 100% = 5%
Signed Error (Direction)
(95 − 100) ÷ |100| × 100% = 5% underestimate
Experimental Accuracy
95% accurate
Interpretation
Moderate error — review your measurement procedure. Consider recalibrating instruments or checking for systematic bias.
The negative signed error suggests your measurement was lower than the true value (systematic underestimation).
Percent Error Benchmarks
< 1%
Excellent
< 5%
Good
< 10%
Acceptable
> 15%
Needs Review
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