Net Promoter Score Calculator
The NPS calculator converts promoter, passive and detractor response counts into Net Promoter Score on the standard −100 to +100 scale.
How to use this calculator
- Enter counts for the three mutually exclusive response groups; the total must contain at least one response.
- Check the units and definitions before comparing results with another source.
- Change one input at a time when comparing scenarios, and keep the reporting period and assumptions consistent.
Formula used by the net promoter score calculator
NPS = (promoters − detractors) ÷ total responses × 100
- NPS = (promoters − detractors) ÷ total responses × 100
- NPS is a survey metric affected by who responds, the question wording and survey timing. It does not explain the reasons behind a score.
- Inputs are checked for required values and valid ranges; displayed results are rounded for readability.
Worked examples
Worked example
70 promoters, 20 passives and 10 detractors.
Total responses are 100 and NPS is (70−10)/100×100 = +60.
Total responses are 100 and NPS is (70−10)/100×100 = +60.
Understanding the result
The NPS calculator converts promoter, passive and detractor response counts into Net Promoter Score on the standard −100 to +100 scale.
NPS is a survey metric affected by who responds, the question wording and survey timing. It does not explain the reasons behind a score.
Important notes
NPS is a survey metric affected by who responds, the question wording and survey timing. It does not explain the reasons behind a score.
The result applies to the numbers and assumptions entered here; verify specifications for safety-critical or regulated uses.
Frequently asked questions
Do passives affect the NPS numerator?
No. Passives count in the total response denominator but are not added to promoters or detractors.
Can NPS be negative?
Yes. If detractors outnumber promoters, the score is negative; the range is −100 to +100.
How do I use this calculator?
Enter counts for the three mutually exclusive response groups; the total must contain at least one response.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
- How to Calculate a Z-Score — Learn how a z-score shows how far a value is from the mean in standard-deviation units.
- How to Calculate Standard Deviation — Learn what standard deviation measures, the population and sample formulas, and how to interpret the result.
- Z-Score — Learn what a z-score measures and how it describes a value relative to a mean and standard deviation.
This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.