Work out bug escape rate instantly with clear inputs, formula shown and shareable results.
Defect removal efficiency is the share of all defects caught before release, and its complement is the escape rate. Industry benchmarks put good practice around 85 to 95 percent removal efficiency. It is a better quality signal than raw defect counts because it normalises for how buggy the code was in the first place.
Escape rate
escape rate = production defects / (pre-release + production defects); removal efficiency = 100% - escape rate; density = total defects / KLOC
Below 10 to 15 percent for mature teams. The absolute number matters less than the trend and than which test stage is missing the defects.
Yes, for decisions. One escaped data-corruption defect matters more than twenty cosmetic ones, so track severity-weighted escape rate alongside the raw figure.