NPS Calculator
Count how many people answered 9 to 10, 7 to 8 and 0 to 6, drop the three totals in, and get your Net Promoter Score. It also shows how many responses the score is built on.
About this tool
The score is the share of promoters minus the share of detractors, rounded to a whole number between -100 and 100. Passives still count towards the total, which is why adding a passive pulls the score down slightly even though nobody said anything negative. The result comes with a plain label, from “needs improvement” through to “excellent”, and the response count that produced it.
The three fields take whole numbers only, since they are counts of people. Enter at least one response in total and the score appears as you type.
Everything runs in your browser — nothing you enter here is sent to a server or stored. Provided as is, without warranty.
What NPS is good for, and where it misleads
The survey is one question: how likely are you to recommend this to a friend or colleague, from 0 to 10. Scores of 9 and 10 are promoters, 7 and 8 are passives, and everything from 0 to 6 counts as a detractor. That last bucket surprises people the first time they see it. A 6 out of 10 feels like a pass mark in most of life, but in this scale it is grouped with the people who actively complain. The bucketing is deliberately harsh, which is the whole reason the number moves at all when sentiment shifts.
For a small team the value of NPS is not the number, it is the free-text follow-up. “What is the main reason for your score?” asked immediately after the rating will give you more usable product direction in fifty responses than the score itself will give you in a year. Track the score if you like, but read every comment. Sort them by bucket and you will usually find that detractors cluster around two or three concrete complaints, which is a roadmap.
Two traps worth recognising. The first is sample size: because the score is a difference between two percentages, it is far jumpier than the response count suggests. With 20 responses, one person moving from a 6 to a 9 shifts your NPS by 10 points, so a quarter-on-quarter change of 15 points on small samples is not a trend, it is a rounding artefact. The second is who you asked. Sending the survey only to active users, or only to people who just had a successful session, filters out exactly the people whose opinion would have moved the number. Churned users are part of the picture even though they are the ones you least want to hear from.
Be careful with benchmarks too. Published industry averages come from different survey channels, different wordings and different response rates, and cross-country comparison is genuinely distorted because rating culture varies: some markets rarely award a 10 to anything. Your own score last quarter, measured the same way, is the only honest comparison you have. If you want to express the movement between two of your scores as a percentage change, the percentage increase calculator will do it, though bear in mind a score that crosses zero makes percentage change meaningless.
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