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The Net Promotor Score (NPS)

The net promotor score is a number between minus 100% and 100%. To compute a Net Promoter score you need to subtract the percentage of Detractors from the percentage of Promoters. You obtain a Net Promoter Score by asking customers a single (loyalty) question on a 0 to 10 rating scale:

How likely is it that you would recommend to a friend or colleague?

Based on their responses, customers can be categorized into one of three groups:

  1. Promoters (9-10 rating),
  2. Passives (7-8 rating), and
  3. Detractors (0-6 rating).

 The percentage of Detractors is then subtracted from the percentage of Promoters to obtain a Net Promoter score. see figure 7. 

net-promotor-score-calculation
Figure7. NPS calculation.

 

Tracking net promoters (the percentage of customers who are promoters of a brand or company minus the percentage who are detractors) offers organizations a powerful way to measure and manage customer loyalty. Firms with the highest net-promoter scores consistently garner the lion's share of industry growth.

Example (1):

  • Detractors : 20%
  • Passives : 30%
  • Promotors : 50%
  • 50-20 = 30

The net promotor score : 30

 

Example (2):

  • Detractors : 30%
  • Passives : 50%
  • Promotors : 20%
  • 20-30 = -10

The net promotor score: -10 (minus 10)

The score does not follow a 0-100 scale but a -100% to +1-00% scale

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