TrustNPSHow to calculate NPS
Formula
Count promoters (9 or 10), passives (7 or 8), and detractors (0 to 6). NPS = ((promoters - detractors) / all answers) x 100. Round to the nearest integer. Passives stay in the denominator. They are not promoters and they are not detractors.
Worked arithmetic, not a market statistic: 50 promoters, 30 passives, and 20 detractors. (50 - 20) / 100 x 100 = 30. TrustNPS applies this to surveys sent in the last 90 days and publishes the score only at 30 answers or more.
Calculator
Enter counts. The result uses the formula above. It is not a benchmark and it is not a TrustNPS score unless those counts came from verified buyers.