Percent Error Calculator
Calculate the relative percent error between an observed (experimental) value and a true (accepted) value.
Percent Error
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Percent Error Formula
% Error = (|Observed − True| / |True|) × 100
Observed = 9.8, True = 9.81
% Error = |9.8 − 9.81| / |9.81| × 100 = 0.102%
% Error = |9.8 − 9.81| / |9.81| × 100 = 0.102%
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Last updated: 2026-08-08