NPS calculator
Use this NPS calculator to get your Net Promoter Score and how far to trust it. Enter how many customers scored you 9 or 10, 7 or 8, and 0 to 6, or a count for each score from 0 to 10. Worked out in your browser: nothing you type is sent anywhere.
Enter your survey answers and the score appears here.
Worked out in your browser. Nothing you type leaves this page.
Net Promoter Score, explained
How is the Net Promoter Score worked out?
Customers who score 9 or 10 are promoters, 7 or 8 are passives and 0 to 6 are detractors. The score is the share of promoters minus the share of detractors, as a number from minus 100 to 100. With 50 promoters, 30 passives and 20 detractors out of 100 answers, the score is 50 minus 20, which is 30.
What does the margin of error mean?
It shows how far the score could be from the true figure for all your customers, because you only heard from some of them. The tool gives a 95% margin: with 50, 30 and 20 the margin is about 15.3 points, so the true score is likely between about 15 and 45. A smaller margin means a score you can lean on more.
Why do small samples swing so much?
With few answers, one or two people changing their score moves the result a long way. The margin shrinks only with the square root of the number of answers, so four times as many answers halves it. With few answers, for example under 30, the margin is wide, so treat the score as a rough guide and look at the range instead of one number.
Do passives count?
Passives are included in the total number of answers, so they pull both shares down, but they add nothing to the score itself. A passive is neither for nor against you.
Is anything I type sent anywhere?
No. The NPS calculator works out the score in your browser on this page and nothing you type leaves your device.
Also free: percentage and discount calculator, ROI calculator, word and SMS counter, and every free business tool.
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