When to use this calculator
Calculate a net promoter score from grouped survey counts. Passives remain in the total. Promoter and detractor grouping must follow the survey scale being used.
Explore the marketing & customer calculators for other questions in this topic. For a related calculation, use the Net Revenue Retention Calculator: Measure recurring-revenue retention including expansion in an existing customer cohort.
PUTTING IT INTO PRACTICE
Net Promoter Score: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Promoters (integer) | 60 |
| Detractors (integer) | 20 |
| All valid respondents (integer) | 100 |
| Result | 40 score points |
- Check the input labels and enter the example values above.
- Apply the relationship: NPS = 100 × (promoters − detractors)/respondents.
- The result is 40 score points, rounded for display.
How to interpret your result
Passives remain in the total. Promoter and detractor grouping must follow the survey scale being used.
Define the event, audience and attribution window before calculating a rate. Clicks, customers and orders are different units. Acquisition cost and campaign CPA may cover different spending categories.
Frequently asked questions
Should I count unique users or total events?
Use the definition matching your metric. State it consistently because repeat events can produce a different rate from unique people.
When is the net promoter score calculator useful?
Calculate a net promoter score from grouped survey counts. Passives remain in the total. Promoter and detractor grouping must follow the survey scale being used.
How do I use the net promoter score calculator?
Enter promoters (integer), detractors (integer), all valid respondents (integer). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
NPS = 100 × (promoters − detractors)/respondents.
What should I check before using the result?
Passives remain in the total. Promoter and detractor grouping must follow the survey scale being used.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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