What Is Net Promoter Score?
Net Promoter Score, or NPS, is a customer loyalty metric built around a single survey question: on a scale of 0 to 10, how likely are you to recommend this business to a friend or colleague? Respondents who score 9 or 10 are promoters, those who score 7 or 8 are passives, and anyone scoring 0 to 6 is a detractor.
The score itself is calculated by subtracting the percentage of detractors from the percentage of promoters, producing a number between -100 and +100. A positive score means you have more promoters than detractors. Scores above 50 are generally considered excellent, while anything above 70 is world class in most industries.
For South African service businesses, NPS provides an early warning system. A falling score often predicts churn months before it shows up in revenue, giving you time to fix the underlying experience issues.
How to Use NPS in Your Business
The real value of NPS lies in the follow-up question: why did you give that score? Detractor feedback highlights friction points worth fixing first, while promoter feedback tells you which strengths to emphasise in your marketing and on your website.
Survey timing matters. Measuring NPS immediately after onboarding, after support interactions, and at regular relationship intervals gives you a fuller picture than a single annual survey. Pair NPS trends with review velocity on your Google Business Profile to track reputation in the channels that influence buying decisions.
What Net Promoter Score is
Net Promoter Score (NPS) is a widely-used metric of customer loyalty and satisfaction, based on a single question: how likely a customer is, on a scale of 0 to 10, to recommend the business, product or service to others. Respondents are grouped by their answer: those scoring 9 or 10 are promoters (loyal enthusiasts likely to recommend), those scoring 7 or 8 are passives (satisfied but unenthusiastic), and those scoring 0 to 6 are detractors (unhappy customers who may discourage others). The Net Promoter Score is calculated by subtracting the percentage of detractors from the percentage of promoters, giving a single number that can range from -100 (all detractors) to +100 (all promoters). NPS is popular because it is simple to collect and understand, gives a single trackable measure of customer sentiment and loyalty, and correlates with word-of-mouth advocacy and retention, since promoters recommend and stay while detractors churn and warn others away. It is used to benchmark customer loyalty over time, compare against competitors or industry norms, and flag whether a business is building advocates or accumulating unhappy customers. While NPS is only one measure and has limitations, it remains a common, convenient gauge of the loyalty and recommendation likelihood that underpin sustainable growth.
Using NPS to improve
The value of NPS lies less in the headline number than in what a business does with it. Tracking NPS over time shows whether customer loyalty is improving or declining, and comparing segments (by product, region or customer type) reveals where advocacy is strong or weak. But the most useful part is often the follow-up: asking respondents why they gave their score turns NPS from a bare number into actionable insight, since detractors' reasons reveal what to fix and promoters' reasons reveal what to reinforce and amplify. Acting on this, resolving the issues that create detractors and doubling down on what delights promoters, is how NPS drives improvement rather than merely measuring. Closing the loop with individual respondents (following up with unhappy detractors to resolve their issues, and engaging promoters as advocates or reviewers) both recovers relationships and turns satisfied customers into active recommenders. NPS should be read alongside other measures, since a single loyalty score does not capture everything, and interpreted with its limitations in mind. For a South African business, tracking NPS and, crucially, acting on the reasons behind the scores provides a simple, ongoing read on customer loyalty and a practical guide to what is building or eroding advocacy, which is the point of measuring it. Used as a trigger for understanding and action rather than a vanity figure, NPS helps a business grow the base of loyal, recommending customers that sustainable growth depends on.
FAQ
What is a good NPS score in South Africa?
An NPS above 0 means you have more promoters than detractors. Scores between 30 and 50 are good for most South African industries, above 50 is excellent, and above 70 is world class. Benchmarks vary by sector, so compare against your industry rather than a global average.
How is Net Promoter Score calculated?
NPS is calculated by subtracting the percentage of detractors (scores 0 to 6) from the percentage of promoters (scores 9 and 10). Passives (scores 7 and 8) are excluded from the calculation. The result is a score between -100 and +100.
How often should a business measure NPS?
Most businesses benefit from measuring NPS quarterly for relationship surveys, plus transactional surveys after key moments such as onboarding or support interactions. Continuous measurement reveals trends that a single annual survey would miss.