NPS, or Net Promoter Score, measures customer loyalty. Specifically, it captures how likely your customers are to recommend your company to someone else. Introduced by Fred Reichheld of Bain & Company in a 2003 Harvard Business Review article titled “The One Number You Need to Grow,” NPS distills customer sentiment into a single number ranging from -100 to +100.
The Question Behind the Score
Every NPS measurement starts with one survey question: “On a scale from 0 to 10, how likely are you to recommend us to a friend or colleague?” That’s it. The entire metric is built on this single response, which is why Reichheld originally called it “the ultimate question.”
Based on how people answer, they fall into three groups:
- Promoters (9 or 10): Highly satisfied customers who actively refer others and keep buying.
- Passives (7 or 8): Satisfied but unenthusiastic. They’re not spreading the word and could switch to a competitor.
- Detractors (0 to 6): Unhappy customers who may discourage others from doing business with you.
The formula is straightforward: subtract the percentage of detractors from the percentage of promoters. If 60% of your respondents are promoters and 20% are detractors, your NPS is 40. Passives aren’t included in the calculation directly, but they lower your score by reducing the share of promoters.
What NPS Actually Tells You
NPS measures what researchers call attitudinal loyalty: the emotional and cognitive commitment a customer feels toward a brand, including their preferences and intentions. It does not directly measure behavioral loyalty, which refers to tangible actions like repeat purchases and ongoing spending. The distinction matters because someone can feel positively about your company without ever buying again, and someone can keep buying out of pure habit without any real attachment.
That said, research consistently shows that attitudinal loyalty predicts behavioral loyalty. A positive attitude rooted in emotional commitment often translates into repeated purchases and word-of-mouth promotion. The reverse isn’t true, though. Just because someone keeps buying doesn’t mean they’re loyal in any meaningful sense. They may simply not have found a better option yet.
This is the core insight NPS tries to capture. By focusing on the extremes of the satisfaction scale (promoters and detractors), the metric zeros in on the customers most likely to drive or undermine growth through their recommendations and purchasing habits. A more granular survey might provide richer data, but the simplicity of NPS is intentional. It’s designed to be easy to track over time and easy to compare across teams, products, or competitors.
How NPS Connects to Revenue
The link between NPS and financial performance is well documented, though it varies by industry. According to Bain & Company’s own research, Net Promoter Scores explain roughly 20% to 60% of the variation in organic growth rates among competitors. On average, an industry’s NPS leader outgrew its competitors by a factor of more than two.
The London School of Economics calculated that a 7-point increase in NPS correlates with a 1% increase in overall revenue. Research from CustomerGauge found that a 10-point NPS increase correlates with a 3.2% increase in upsell revenue specifically. To put detractor costs in concrete terms, Bain’s work with Dell revealed that the company’s 15% detractor rate accounted for $68 million in lost revenue. Converting just 2% to 8% of those detractors into promoters would have added $167 million annually.
These numbers illustrate why NPS became popular with executives. It offers a single, trackable figure that connects customer sentiment to the financial outcomes leadership cares about most.
Industry Benchmarks for Context
A “good” NPS depends entirely on your industry. Some sectors naturally produce higher scores because of the nature of the customer relationship. As of 2025, typical benchmarks look like this:
- Hotels and hospitality: 44
- Banking and financial services: 41
- Grocery retail: 41
- Automotive: 41
- Big box retail: 37
- Airlines: 37
- Insurance: 33
- Software: 30+
If you’re in the software industry with an NPS of 40, you’re outperforming your peers. That same score in hospitality would put you slightly below average. Always compare your score to competitors in your space rather than to some universal standard.
Where NPS Falls Short
NPS has real limitations. The most significant is cultural bias. Research published in the Journal of Business Research found that national culture plays a critical role in how people respond to the NPS question. The relationship between someone’s score and their actual word-of-mouth behavior varies with cultural factors like collectivism, power distance, and uncertainty avoidance. A study comparing responses across the US, UK, China, and Egypt confirmed that the same numerical score can mean different things depending on cultural norms around rating scales. People in some cultures avoid giving extreme scores, which suppresses both promoter and detractor counts.
Other common criticisms include the wide detractor range. Someone who gives you a 6 (mildly dissatisfied) gets lumped in with someone who gives you a 0 (furious). That’s a huge spectrum of customer experience compressed into one category. The metric also tells you nothing about why someone gave the score they did, which is why most companies pair the NPS question with an open-ended follow-up asking for explanation.
There’s also the gap between intention and action. Saying you’d recommend a company is not the same as actually doing it. NPS captures a stated willingness, not a confirmed behavior. Some customers score a 9 or 10 but never mention the brand to anyone. Others might recommend a company despite giving a middling score, simply because the topic came up in conversation.
Earned Growth Rate: The Newer Companion Metric
Reichheld himself recognized these limitations. In 2021, he introduced a companion metric called the earned growth rate, described in a Harvard Business Review article titled “Net Promoter 3.0.” This metric tracks the revenue growth generated specifically by returning customers and their referrals, using actual accounting data rather than survey responses.
To calculate earned growth, companies need systems that track revenue per customer over time and ask all new customers why they signed up. If the answer is a referral or recommendation, that customer counts as “earned.” If they came through advertising, a promotional deal, or a sales pitch, they’re “bought.” Because earned growth rates are based on auditable financial data, they provide a harder, more verifiable measure of whether customer loyalty is actually translating into business results. The idea is to use NPS alongside earned growth, with one measuring sentiment and the other measuring its financial impact.