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eNPS is the percentage of promoters minus the percentage of detractors, so it ranges from -100 to +100 and ignores passives entirely. That deliberate asymmetry is why moving people out of the detractor group shifts the score twice as fast as adding promoters.
eNPS
eNPS = (Promoters - Detractors) / Total responses x 100
Because the score is designed to capture advocacy and risk, not satisfaction. Passives are neither, so they only affect the denominator.
Above 20 is generally considered good and above 50 excellent, though benchmarks vary substantially by industry and country.