Definition
The Net Promoter Score (NPS) is a customer loyalty metric measured through a single question sent by email: "How likely are you to recommend us to a friend or colleague?" on a zero to ten scale. Respondents are classified into three categories: promoters (score 9–10) who are loyal enthusiasts, passives (score 7–8) who are satisfied but unenthusiastic, and detractors (score 0–6) who are unhappy customers who may damage the brand through negative word of mouth. The NPS is calculated by subtracting the percentage of detractors from the percentage of promoters, producing a score ranging from negative 100 to positive 100.
Transactional NPS is measured immediately after a specific interaction such as a purchase or support call, capturing feedback about that particular experience. Relationship NPS is measured periodically (quarterly or biannually) and captures the customer's overall sentiment toward the brand. Email benchmarks for NPS surveys show response rates of 10 to 20 per cent, with higher rates for transactional surveys sent soon after the interaction. The follow-up process is critical: detractors should receive a service recovery outreach, promoters should be encouraged to leave reviews or refer others, and passives should be targeted with engagement improvement initiatives.
Best Practices
Send transactional NPS surveys within 24 to 48 hours of the interaction event. Delays reduce response rates and degrade response accuracy because the customer's memory of the experience fades. Relationship NPS surveys should be sent quarterly at most — more frequent measurement introduces survey fatigue.
Keep the survey to the single NPS question plus one open-ended follow-up. The follow-up question "What is the primary reason for your score?" provides the qualitative context needed to act on the score. Longer surveys reduce completion rates and bias results toward the most engaged respondents.
Automate the follow-up actions based on the score. Detractors should receive a personal outreach from customer service within 24 hours. Promoters should receive a review request or referral invitation. Passives should receive a "we want to do better" message with a feedback form for improvement suggestions.
Segment NPS results by customer lifecycle stage, product line, and channel. A detractor in the first month of subscription has a different problem than a detractor in the twelfth month. Segment-level NPS reveals which parts of the business drive dissatisfaction and which areas are performing well.
Close the feedback loop by communicating changes made in response to NPS feedback. Customers who see that their input led to improvements are more likely to respond to future surveys and have higher loyalty. Publish an annual "you spoke, we listened" summary that highlights NPS-driven changes.
Related Glossary Terms
Email Loyalty
Loyalty programme emails drive retention through points balances, tier upgrades, rewards redemption and VIP offers, with typical open rates of 30 to 50 per cent.
Email Retention
Email programs designed to keep existing customers engaged, reduce churn, and increase lifetime value through targeted lifecycle communication.
Email Survey
The use of email to distribute surveys, collect customer feedback, and analyze response data to improve products and experiences.
Frequently Asked Questions
Industry-average NPS scores vary. For retail and ecommerce, the average NPS is 30 to 50. For SaaS, the average is 20 to 40. For financial services, the average is 15 to 35. Compare your score against your industry specifically rather than a universal benchmark.
A minimum of 100 to 200 responses provides a reasonable estimate, but more responses increase confidence. For segment-level analysis, aim for at least 50 responses per segment. Use confidence intervals to report the range within which the true NPS is likely to fall.
Transactional NPS measures satisfaction with a specific interaction, such as a purchase or support call. It is sent immediately after the event and captures experience-specific feedback. Relationship NPS measures overall brand sentiment and is sent periodically. Transactional scores tend to be higher and more variable.
Send the survey within 24 hours of the interaction. Use a clear subject line that mentions the interaction. Keep the survey to one question. Offer to share the results with the respondent. Send a single reminder to non-respondents after three to five days. A 10 to 20 per cent response rate is a realistic target.
Yes, passives are at risk of becoming detractors or churning. Follow up with passives to understand what would move them to a promoter score. Passives often indicate a "good enough" experience that lacks the delight needed for retention. A targeted improvement initiative can convert passives to promoters over time.