Percentage Uncertainty
The absolute uncertainty of a measurement divided by the measured value, expressed as a percentage.
Governing formula
Percentage Uncertainty = (Δx / x) × 100%
SI unit
%
In depth
Percentage uncertainty quantifies relative precision independent of measurement scale, allowing easy comparison of precision between small and large quantities.
Examples in the real world
For a mass measurement of 50.0 ± 0.5 g, the percentage uncertainty is (0.5 / 50.0) × 100% = 1.0%.