Last updated: 2026-07-13

What Net Promoter Score measures

Net Promoter Score (NPS) is a customer-loyalty metric built on a single survey question: "How likely are you to recommend us to a friend or colleague?" answered on a scale from 0 to 10. The idea, introduced by Fred Reichheld in 2003, is that willingness to recommend captures loyalty better than a generic satisfaction rating, because a recommendation puts the respondent's own reputation on the line.

Responses are sorted into three groups by score, and the score is the net balance between the enthusiastic and the unhappy.

The three groups

Passives sit in the middle. They count toward the total number of responses but are left out of the final subtraction, which is what makes NPS a measure of net enthusiasm rather than average satisfaction.

The formula

Each percentage is taken over the total number of respondents, passives included. Because it is a difference of two percentages, NPS lands on a scale from −100 (everyone is a detractor) to +100 (everyone is a promoter). It is reported as a whole number, not a percentage — a score of 45, not 45%.

Worked example

Suppose a survey collects 100 responses: 70 promoters, 20 passives, and 10 detractors.

Promoters make up 70% and detractors 10%, so the NPS is 60. The 20 passives do not change the difference, but they do enlarge the denominator: if those same 70 promoters and 10 detractors sat in a survey of only 80 people, the percentages — and the score — would be higher.

Reading the result

There is no universal pass mark, but these bands are a common rule of thumb:

Any score above 0 means promoters outnumber detractors. Scores above 50 are strong in almost any context, but the honest benchmark is not a fixed table: NPS varies widely by industry, region, and how the survey is run. The most useful comparison is against your own trend over time and against direct competitors measured the same way.

Limitations to keep in mind

NPS is popular because it is simple, but the simplicity throws information away. A 9 and a 6 both disappear into a single band, and two very different response distributions can produce the same score. It measures stated intent to recommend, not actual referrals, and it is sensitive to sample size, survey timing, and cultural differences in how people use rating scales — respondents in some regions rarely give a perfect 10 even when highly satisfied.

Treat NPS as one indicator among several. Pair it with hard behavioural metrics such as a Churn Rate Calculator and Net Revenue Retention (NRR) Calculator to see whether stated loyalty is showing up in retention, and use the qualitative comments behind the scores to learn why customers landed where they did.

Improving the score

There are two levers, and they matter unequally. Reducing detractors usually moves the score fastest, because every detractor converted to a passive removes a full point of drag and often addresses a fixable problem — a support gap, a billing surprise, an onboarding hurdle. Converting passives into promoters is the second lever: passives are already satisfied, so a small extra push in the experience can tip them into active advocacy. Because a recommendation reflects the whole relationship, the most durable gains come from the parts of the product and service customers encounter most often.