Calculator Inputs
Enter previous and current survey counts to measure NPS movement, growth efficiency, response behavior, and revenue-linked loyalty signals.
Example Data Table
This sample shows how survey distribution changes can influence NPS growth rate and advocacy quality.
| Period | Promoters | Passives | Detractors | Total Responses | NPS |
|---|---|---|---|---|---|
| Quarter 1 | 120 | 60 | 45 | 225 | 33.33 |
| Quarter 2 | 150 | 70 | 30 | 250 | 48.00 |
| Quarter 3 | 168 | 64 | 24 | 256 | 56.25 |
Formula Used
NPS = (% Promoters) − (% Detractors)
% Promoters = (Promoters ÷ Total Responses) × 100
% Detractors = (Detractors ÷ Total Responses) × 100
NPS Point Change = Current NPS − Previous NPS
NPS Growth Rate = (NPS Point Change ÷ |Previous NPS|) × 100
Monthly Change = NPS Point Change ÷ Months Between Surveys
Response Rate = (Total Responses ÷ Contacted Customers) × 100
Advocacy Revenue Proxy = Current Revenue × Current Promoter Share
Revenue At Risk Proxy = Current Revenue × Current Detractor Share
When previous NPS equals zero, the calculator shows the point change but marks relative growth as unavailable to avoid division by zero.
How to Use This Calculator
- Enter previous survey counts for promoters, passives, and detractors.
- Enter the current survey counts for the latest measurement period.
- Add contacted customers if you want response rate calculations.
- Add revenue values to estimate advocacy and risk-linked revenue proxies.
- Enter the number of months between surveys for normalized trend analysis.
- Set a target NPS to compare present performance with your goal.
- Click Calculate NPS Growth to view the result block above the form.
- Use the CSV and PDF buttons to export the calculated summary.
FAQs
1. What does NPS growth rate measure?
It shows how much your Net Promoter Score changed relative to the earlier score. It helps you understand whether customer advocacy is improving, slowing, or declining across survey periods.
2. Why is point change different from growth rate?
Point change is the raw difference between two NPS values. Growth rate expresses that difference relative to the earlier score, which makes movement easier to compare across periods.
3. What happens when previous NPS is zero?
The calculator still reports the current NPS and point change. Relative growth is marked unavailable because dividing by zero would produce a misleading or undefined result.
4. Why include passives if they do not affect NPS directly?
Passives still matter because they influence total response mix. A rising passive share can slow advocacy momentum even when detractors are controlled.
5. How should marketers use the revenue proxy fields?
They provide directional estimates only. Advocacy revenue highlights promoter-linked upside, while revenue at risk estimates how much current revenue sits under detractor exposure.
6. Can this calculator compare monthly and quarterly surveys?
Yes. Enter the number of months between surveys. The monthly point-change metric normalizes movement, making trend comparisons more practical across uneven time windows.
7. Is a higher response rate always better?
Not always. Higher response rates improve confidence, but response quality and sample balance also matter. A larger sample still needs sound outreach and fair representation.
8. What is a good target NPS?
That depends on your industry, maturity, and customer expectations. Many teams use internal benchmarks first, then refine targets using competitive and historical performance trends.