Net Promoter Score (NPS)

What NPS actually means

Net promoter score asks one question on an eleven point scale and discards the middle. Scores of nine and ten count as promoters, zero through six as detractors, and sevens and eights are ignored entirely. That design makes NPS sensitive to shifts at the extremes and blind to a large part of the base, which is both its strength as a warning system and its weakness as a measurement.

Worked example

Out of 400 responses, 180 score nine or ten, 140 score seven or eight, and 80 score zero through six. NPS is 45 percent minus 20 percent, or 25. If 40 of the promoters slip to an eight, the score falls to 15 while the average rating barely moves at all.

Why the board cares

Boards treat NPS as a directional early warning rather than a precise instrument, because it often turns before churn does. Its credibility depends entirely on sampling: a score built from customers who volunteered to respond after a good experience measures enthusiasm for surveys, not loyalty. The verbatim comments are usually worth more than the number itself.

Common mistakes

• Comparing NPS across industries or geographies, where cultural rating norms differ by twenty points or more.
• Surveying only after positive interactions, which builds selection bias directly into the score.
• Tying compensation to NPS, which reliably produces score management rather than customer improvement.

Related terms

• Churn Rate
• Net Revenue Retention (NRR)
• Cohort Analysis

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