NPS Calculator
Compute Net Promoter Score from response counts, with margin of error and benchmarks.
Free · No signup · By the analysts at Blackridge Research · Updated 2026-07-18
Inputs
Results
What this means
Adjust the inputs to calculate.
About the NPS Calculator
Net Promoter Score (NPS) is the most widely used measure of customer loyalty and satisfaction.
It's calculated by subtracting the percentage of detractors from the percentage of promoters.
Formula
NPS = (Promoters - Detractors) / Total Responses × 100
- NPS
- — Net Promoter Score
- P
- — Promoters — respondents rating 9-10
- D
- — Detractors — respondents rating 0-6
- T
- — Total Responses
How to use this calculator
- 1
Enter promoters
Number of respondents who rated 9-10.
- 2
Enter passives
Number of respondents who rated 7-8.
- 3
Enter detractors
Number of respondents who rated 0-6.
Example calculations
Customer NPS survey
A company surveyed 100 customers: 50 promoters, 30 passives, 20 detractors.
NPS = (50 - 20) / 100 × 100 = 30.
- Net Promoter Score:
- 30
- Rating:
- Good
- Total responses:
- 100
- Margin of error:
- ±19.6
NPS = 30 (Good). Margin of error: ±19.6 points.
Interpreting your results
NPS ranges from -100 to +100. A score above 0 is good, above 50 is excellent, above 70 is world-class.
The margin of error tells you the precision of your NPS estimate.
Need the market data behind this calculator?
The NPS Calculator is only as good as its inputs. Blackridge Research publishes syndicated market reports with vetted market sizes, growth rates, and competitive landscapes across 40+ industries — and builds custom studies when the shelf report doesn't exist.
Industry applications
Business
- Customer feedback: track loyalty and satisfaction over time.
- Benchmarking: compare NPS against industry standards.
- Executive reporting: NPS is a standard board-level metric.
Construction
- Client satisfaction: measure project owner satisfaction.
- Subcontractor satisfaction: track subcontractor loyalty.
- Vendor satisfaction: measure supply chain relationships.
Research
- Customer research: NPS is standard in customer satisfaction studies.
- Benchmarking studies: compare NPS across companies and industries.
Common mistakes to avoid
-
✗ Dropping passives from calculation
Passives don't count in the score but they still reduce the maximum possible score.
-
✗ Reporting NPS without margin of error
Always report the margin of error to show precision.
Frequently asked questions
›What is a good NPS?
Above 0 is good, above 50 is excellent, above 70 is world-class.
›How many responses do I need for NPS?
A minimum of 30-50 responses is recommended for reliable NPS.
Glossary
- NPS:
- Net Promoter Score — a measure of customer loyalty.
- Promoters:
- Customers who rate 9-10 — highly loyal.
- Detractors:
- Customers who rate 0-6 — unhappy.
- Passives:
- Customers who rate 7-8 — satisfied but not enthusiastic.
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