Net Promoter Score (NPS) is a customer-loyalty metric measured by a single survey question: "On a scale of 0 to 10, how likely are you to recommend us to a friend?" Customers who score 9–10 are promoters, 7–8 are passives, and 0–6 are detractors. NPS is calculated as the percentage of promoters minus the percentage of detractors, producing a number between –100 and +100. The score itself is a starting point; the value comes from customer feedback analysis on the open-ended responses that accompany it.
How NPS is calculated
If 60% of respondents are promoters, 25% passives, and 15% detractors, NPS = 60 – 15 = 45. Passives don't enter the calculation directly but matter for trend tracking — passives drifting toward detractor territory is an early signal of declining satisfaction.
Why NPS matters for ecommerce
NPS captures something most performance metrics miss: whether customers feel strongly enough about the brand to recommend it. Conversion rate, AOV, and repeat purchase rate measure transactional behavior; NPS measures the emotional foundation underneath that behavior. Brands with high NPS tend to have lower CAC over time (more referrals, more branded search) and higher retention; brands with deteriorating NPS often see those metrics erode 2–4 quarters before the financials reflect the decline.
What counts as a good NPS
NPS is highly category-dependent. Useful reference points for ecommerce:
- Below 0: more detractors than promoters. Material customer experience problem; brand health is at risk regardless of short-term financials.
- 0 to 30: below-average for ecommerce. Indicates inconsistent experience or weak differentiation.
- 30 to 50: mid-range, typical of well-run but not category-leading brands.
- 50 to 70: strong performance. Often correlates with high repeat-purchase rates and meaningful organic growth.
- 70+: exceptional. Common in category leaders with strong product-market fit and brand affinity (Apple, Tesla, Trader Joe's territory).
The trend matters more than the absolute number. NPS rising over time is healthier than a static high score that's been declining.
What a poor NPS tells you
- Product or quality issues: detractors most often cite product disappointment or quality problems. Their open-ended responses are the diagnostic.
- Fulfillment and post-purchase experience: late shipping, poor packaging, broken items, and return friction drive detractor scores even when the product is good.
- Customer support gaps: response time, resolution quality, and channel availability shape NPS heavily.
- Expectation mismatch: when marketing oversells what the product delivers, NPS suffers regardless of product quality.
How to improve NPS
- Read every detractor open-ended response. The pattern across responses tells you what's actually wrong, not what the team thinks is wrong.
- Close the loop with detractors. Reaching out to detractors with a real fix (not a canned apology) often converts them to passives or promoters and reduces churn.
- Fix the systemic causes, not just the symptoms. If shipping is the top complaint, fixing one customer's experience doesn't help; fixing the carrier choice or 3PL workflow does.
- Track NPS by acquisition channel and customer segment. Different channels often produce very different NPS — sometimes paid acquisition brings in customers with mismatched expectations who score lower than referral-acquired customers, even with the same product.
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