Net Promoter Score (NPS) Defined
Net Promoter Score (NPS) is a customer loyalty metric based on one question: how likely are you to recommend us to a friend or colleague, on a 0 to 10 scale? NPS equals the percentage of promoters (9 or 10) minus the percentage of detractors (0 to 6), giving a score from -100 to 100.
Most customer metrics measure a moment: was this ticket resolved, was this agent helpful. Net Promoter Score asks something bigger. It measures whether a customer likes the company enough to put their own reputation behind it, which is why executives often treat it as a proxy for future growth.
What is Net Promoter Score?
Net Promoter Score is a loyalty metric built on a single survey question: "On a scale of 0 to 10, how likely are you to recommend [company] to a friend or colleague?" Fred Reichheld and Bain & Company introduced it in 2003, and it has since become one of the most widely reported customer metrics in business.
Respondents fall into three groups:
- Promoters (9 to 10): loyal customers likely to buy again and refer others
- Passives (7 to 8): satisfied but open to switching
- Detractors (0 to 6): unhappy customers who may churn or discourage others
The formula ignores passives: NPS = % promoters minus % detractors. If 50% of respondents are promoters, 30% passives, and 20% detractors, the NPS is 30.
Why NPS matters
NPS gives leadership one number to track customer sentiment about the whole relationship, not just the last interaction. Because it is simple and standardized, it is easy to compare over time and, with care, against competitors.
For support teams, NPS is a lagging indicator shaped by many things outside their control, including price, product quality, and delivery. Support still moves it: repeat contacts, long waits, and unresolved problems are common reasons customers give low scores. Comments attached to detractor responses are often the most useful part of the survey, because they point to the specific experience that went wrong.
How NPS is measured
- Choose the type: relationship NPS is sent on a schedule (for example, quarterly) to measure overall loyalty. Transactional NPS is sent after a specific event, such as a support conversation or a purchase.
- Ask the question, followed by an open-ended "What is the main reason for your score?"
- Group responses into promoters, passives, and detractors.
- Calculate the score by subtracting the detractor percentage from the promoter percentage.
- Close the loop: follow up with detractors, look for patterns in the comments, and fix the root causes.
What counts as a good score depends on industry. As a rough guide, any positive score means more promoters than detractors, and scores above 50 are widely considered excellent.
NPS vs. CSAT vs. CX Score
| NPS | CSAT | CX Score | |
|---|---|---|---|
| Measures | Loyalty to the company | Satisfaction with one interaction | Quality of each support conversation |
| Question | How likely are you to recommend us? | How satisfied were you? | No survey; scored by AI |
| Coverage | Survey respondents only | Survey respondents only | Every conversation |
| Best for | Long-term relationship health | Service quality right after contact | Finding patterns across all conversations |
CSAT tells you whether a customer was happy with a specific interaction. NPS tells you whether they are loyal to the company overall. A CX Score avoids the survey sampling problem by evaluating every conversation automatically, which is useful because survey response rates in support are often low.
How Fin relates to NPS
Fin does not calculate NPS, but it affects the support experience that feeds it. Fin resolves conversations instantly at any hour, and its CX Score rates every conversation for resolution, sentiment, and service quality, which gives teams an early read on the issues that would otherwise surface later as detractor comments.
Frequently asked questions
Can NPS be negative?
Yes. NPS ranges from -100 (every respondent is a detractor) to 100 (every respondent is a promoter). A negative score means detractors outnumber promoters.
Should support teams own NPS?
Usually not alone. Support influences NPS, but so do product, pricing, and marketing. Support teams are better measured on metrics they control directly, such as resolution rate and CSAT, with NPS as a shared company metric.