What is the Net Promoter Score formula?

NPS = %Promoters − %Detractors. Promoters are respondents who give a 9 or 10, passives give 7 or 8, and detractors give 0–6. Passives are counted in the total (denominator) but excluded from the score itself. The result always falls between −100 and +100.

Industry benchmarks vary widely, but a common rule of thumb is: below 0 = critical (more detractors than promoters); 0–29 = OK; 30–49 = good; 50–69 = great; 70+ = world-class (Apple and Netflix territory). Always compare to your own sector, because a score of 30 is excellent in some industries and mediocre in others.

How many responses do I need for a reliable NPS?

Most practitioners consider 100+ responses a minimum for a statistically meaningful NPS. Below 50, a single detractor or promoter can swing the score by several points, making trend analysis unreliable. For quarterly tracking, aim for at least 200 responses per cohort.

Why are passives excluded from the NPS calculation?

Passives (7–8) are considered neutral — they are satisfied enough not to churn actively, but not enthusiastic enough to recommend you. Fred Reichheld and Bain deliberately excluded them to keep the metric focused on the extremes: the true advocates and the at-risk detractors. Passives do affect the score indirectly by increasing the denominator, which dilutes both percentages.

What is the difference between NPS and CSAT?

NPS (Net Promoter Score) asks a single forward-looking loyalty question: "How likely are you to recommend us?" CSAT (Customer Satisfaction Score) measures satisfaction with a specific interaction or product, usually on a 1–5 or 1–10 scale. NPS is a leading indicator of long-term growth; CSAT is a better signal for immediate service quality. Many companies use both.

How do I improve a low NPS?

The fastest way is to close the loop with detractors within 48 hours of their response — phone or email them, ask what went wrong, and fix it. Even when you cannot resolve their issue, the act of reaching out converts a measurable percentage into passives or promoters. Systemically, focus on the top two or three pain-point drivers revealed by open-text follow-up questions, rather than trying to improve every metric at once.

Net Promoter Score (NPS) Calculator

The Net Promoter Score (NPS) is the gold-standard single-question metric for measuring customer loyalty and predicting organic growth. First published by Fred Reichheld in the Harvard Business Review in 2003, it has since been adopted by two-thirds of Fortune 1000 companies as a core KPI. This calculator gives you your NPS instantly — from either pre-grouped counts or a raw list of 0–10 survey responses — together with a visual gauge, a stacked proportion bar and a plain-English rating so you know exactly what the number means.

How it works

Respondents are asked a single question: “How likely are you to recommend us to a friend or colleague?” on a 0–10 scale. Their answers fall into three buckets:

Promoters (9–10): loyal enthusiasts who actively refer new customers and are unlikely to churn.
Passives (7–8): satisfied but unenthusiastic; vulnerable to competitive offers.
Detractors (0–6): unhappy customers who can damage your brand through negative word-of-mouth.

The score is then:

NPS = %Promoters − %Detractors

Both percentages are calculated against the total number of respondents (including passives), even though passives do not contribute directly to the score. This means adding more passive responses dilutes both percentages, which pulls a very high score down slightly and nudges a very negative score upward — a mathematically honest reflection of a lukewarm audience.

Worked example

Suppose you survey 100 customers and receive: 42 promoters, 31 passives, 27 detractors.

Promoter % = 42 ÷ 100 = 42%
Detractor % = 27 ÷ 100 = 27%
NPS = 42 − 27 = +15

A score of +15 is “Needs work” by the benchmarks in this calculator. It tells you that although you have more advocates than critics, the gap is not wide enough to generate meaningful referral-driven growth. The promoter-to-detractor ratio is 42 ÷ 27 ≈ 1.56 : 1. For context, companies with sustained high growth tend to run at 3 : 1 or higher.

Now suppose you close the loop with detractors and convert just 10 of them into passives. Your new counts are 42 / 41 / 17, giving NPS = 42 − 17 = +25 — a 10-point improvement from one focused intervention.

Promoters	Passives	Detractors	NPS
42	31	27	+15
60	25	15	+45
80	15	5	+75
20	40	40	-20

Formula note

The formula is deliberately simple: it strips away nuance to produce a single shareable number. Its power is not in precision — a 95% confidence interval on NPS can be ±5 to ±10 points depending on sample size — but in consistent tracking over time. Use it as a trend signal and a conversation starter, not as an absolute truth. Pair it with open-text follow-up questions to understand why respondents scored as they did, and always segment by product line, customer cohort or country before acting on the aggregate.