If you’ve ever gotten a survey asking “How likely are you to recommend us to a friend or colleague?” on a 0-10 scale, you’ve taken a Net Promoter Score survey. It’s the single most common loyalty metric in business, used across SaaS, retail, healthcare, and financial services to gauge how customers really feel.
What makes NPS more than just another survey number is what it was originally built to do: predict word-of-mouth growth. This guide breaks down what NPS is, exactly how to calculate it, and why it’s one of the most useful signals you have for figuring out which customers are ready to refer others to your business.
Quick Answer
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?” (scored 0-10). Respondents are grouped into Promoters (9-10), Passives (7-8), and Detractors (0-6), and the score is calculated as the percentage of Promoters minus the percentage of Detractors, giving a result between -100 and +100. Because the question directly asks about recommending, Promoters are also your most likely source of referrals — NPS is essentially a built-in way to find the customers worth asking.
How NPS Is Calculated (Step by Step)
Start by sending the core question — “How likely are you to recommend [your business] to a friend or colleague?” — with a 0-to-10 rating scale. Many teams pair it with a follow-up like “What’s the main reason for your score?” to capture the why behind the number, which is often more useful than the number itself.
Once responses come in, sort them into three buckets. Promoters are anyone who answered 9 or 10 — your enthusiastic, loyal customers who are the most likely to refer people and stick around. Passives answered 7 or 8; they’re satisfied enough but not emotionally invested, and they’ll switch to a competitor without much friction. Detractors answered 0 through 6; they’re unhappy and can actively steer people away from you if left unaddressed.
To get the score, calculate what percentage of total respondents are Promoters and what percentage are Detractors, then subtract: NPS = %Promoters − %Detractors. Passives count toward the total number of respondents but aren’t part of the formula itself. A business where 60% of respondents are Promoters and 10% are Detractors has an NPS of 50.
As a rough reference point, a positive score (above 0) means you have more Promoters than Detractors, which is generally considered acceptable. Scores in the 30s and 40s are typically viewed as good, scores above 50 as excellent, and scores above 70 as exceptional. What counts as “good” varies a lot by industry, so it’s most useful to track your own score over time and compare against direct competitors rather than a single universal benchmark.
Why NPS Predicts Referrals
NPS was introduced by Fred Reichheld in a 2003 Harvard Business Review article, “The One Number You Need to Grow,” developed with Bain & Company and Satmetrix. The research behind it tested a range of survey questions against actual customer behavior — repeat purchases and referrals — and found that willingness to recommend correlated more closely with real growth than traditional satisfaction scores did.
The reason it works as a referral predictor is straightforward: the question literally asks about recommending. A customer who scores you a 9 or 10 has already told you, in their own words, that they’d vouch for you. That’s a very different starting point than trying to guess who might be open to a referral ask. Passives and Detractors, by contrast, are unlikely to refer anyone until whatever is holding them back gets addressed.
This is why NPS and referral programs pair so naturally. Instead of blasting a referral request to your entire customer list, you can use NPS responses to segment: send referral asks to Promoters, send a win-back or support follow-up to Detractors, and use Passives’ feedback to figure out what’s keeping them from becoming Promoters. Some teams automate this by triggering a referral or review request the moment a customer submits a 9 or 10, while routing anything 6 or below to a support or recovery workflow.
Tips / Common Mistakes
Ask for the referral close to the moment of positive feedback, not weeks later. Enthusiasm from a great experience fades quickly, so the highest-converting time to ask a Promoter for a referral is right after they give you a 9 or 10, not in a separate campaign sent months down the line.
Don’t skip the follow-up question. The score alone tells you who might refer; the open-ended “why” tells you what to say in your referral ask or testimonial request, and it surfaces issues from Detractors and Passives that you can actually fix.
Avoid comparing your score to a generic industry number pulled from a different report — benchmarks vary widely by source and industry. Track your own NPS trend over time and against direct competitors instead.
Don’t ignore Passives. They’re not complaining, but they’re not advocating either, and a small nudge (a feature they’ve been asking for, a support win) can move them into Promoter territory.
Watch your response rate and survey frequency. Sending NPS surveys too often, or to too small a sample, produces noisy scores that swing wildly and aren’t reliable enough to act on.
Explore more: more referral basics.
Net Promoter Score (NPS) FAQs
What is a good NPS score?
Any score above 0 means you have more Promoters than Detractors, which is a reasonable baseline. Scores in the 30-40 range are typically considered good, above 50 is excellent, and above 70 is exceptional — though what’s “good” depends heavily on your industry, so compare your score against your own history and direct competitors rather than a single universal number.
How is NPS different from customer satisfaction (CSAT)?
CSAT measures satisfaction with a specific interaction or transaction, usually right after it happens. NPS measures overall loyalty to the brand and willingness to recommend it, making it a better long-term indicator of referral behavior and repeat business rather than a one-off experience.
Can I use NPS to run a referral program?
Yes — it’s one of the most common uses. Because the NPS question already asks about recommending, a score of 9 or 10 is a natural trigger to follow up with a referral ask, discount code, or shareable link while the customer’s positive feelings are fresh.
How often should I send NPS surveys?
It depends on your business model, but many companies survey on a recurring basis (such as quarterly) for ongoing relationships, plus at key moments like after onboarding or a support interaction. Surveying too frequently can cause fatigue and lower response rates, which makes the score less reliable.
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