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Net Promoter Score Calculator

Work out your Net Promoter Score from the number of promoters, passives and detractors, or paste the raw 0–10 answers from your survey. You also get the 95% margin of error and how many new promoters it takes to reach a target score.

Input method

Paste a column from a spreadsheet; separate scores with spaces, commas or new lines.

Shows how many new promoters you would need.

Enter your values to see the result.
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How to use the Net Promoter Score Calculator

  1. Choose an input method: group counts, or paste the raw scores.
  2. Enter the counts of promoters (9–10), passives (7–8) and detractors (0–6), or paste the 0–10 answers.
  3. Add a target NPS if you want to know how many extra promoters you need.
  4. Press Calculate NPS to see the score, breakdown and margin of error.
  5. Copy the summary or download the score table as CSV for your report.

The NPS formula

NPS = (promoters ÷ total responses × 100) − (detractors ÷ total responses × 100)

  • Promoters: answered 9 or 10.
  • Passives: answered 7 or 8. They count in the total but are not added or subtracted.
  • Detractors: answered 0 to 6.

Because NPS is a difference of two percentages, it is reported as a whole number between −100 and +100, not as a percent.

Example scores

PromotersPassivesDetractorsResponsesNPS
503020100+30
1205030200+45
702010100+60
303040100−10
40600100+40

The last two rows show why the distribution matters: a survey with no detractors but many passives can score lower than one with more promoters and some detractors.

Reaching a target score

If you add x new promoters and nothing else changes, the new score is (P + x − D) ÷ (n + x). Solving for x gives x = (target × n − P + D) ÷ (1 − target), with the target written as a fraction (50 → 0.5). For 120 promoters, 30 detractors and 200 responses, reaching 50 takes (100 − 120 + 30) ÷ 0.5 = 20 more promoters.

Frequently asked questions

How do you calculate Net Promoter Score?

Ask 'How likely are you to recommend us to a friend or colleague?' on a 0–10 scale. People answering 9 or 10 are promoters, 7 or 8 passives and 0 to 6 detractors. NPS = % promoters − % detractors. With 120 promoters, 50 passives and 30 detractors out of 200, NPS = 60% − 15% = 45.

What is a good NPS?

Any score above 0 means you have more promoters than detractors. As a rough rule of thumb, scores above 30 are often considered good, above 50 very good and above 70 excellent, but typical scores vary a lot by industry and region, so compare against your own past results and direct competitors.

Why are passives not in the formula?

Passives count toward the total number of responses, so they lower both percentages, but they are neither added nor subtracted. Turning a passive into a promoter raises NPS; turning a passive into a detractor lowers it.

Can NPS be negative?

Yes. NPS ranges from −100 (everyone is a detractor) to +100 (everyone is a promoter). A negative score means detractors outnumber promoters.

How many responses do I need for a reliable NPS?

The margin of error shrinks with more responses. With around 100 responses the 95% margin of error is often ±10 to ±15 points, so small changes between surveys may just be noise. The calculator shows the margin for your data.

How is the NPS margin of error calculated?

It uses the variance of the NPS: standard error = √((p + d − (p − d)²) ÷ n), where p and d are the promoter and detractor shares. The 95% margin is 1.96 × standard error × 100 points.

Is my survey data uploaded?

No. Pasted scores are processed in your browser and never leave your device.

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