Percentage Error Calculator
Compares a measured or experimental value against the accepted/theoretical value — the standard calculation for lab reports.
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The formula
% error = (|experimental − theoretical| ÷ |theoretical|) × 100
The absolute value means percentage error is always reported as positive — it measures the size of the discrepancy, not its direction. Commonly used in physics and chemistry lab work to express how far a measured result strayed from the expected value.