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NPS calculator
Get your Net Promoter Score with its margin of error, and find out whether the change since your last survey is real or just noise.
Your responses
Promoters, passives and detractors
How the score is calculated
Group the answers: promoters 9–10, passives 7–8, detractors 0–6. NPS is the share of promoters minus the share of detractors, on a scale from −100 to +100. Passives count towards the total but neither add nor subtract.
Why a margin of error matters
NPS throws away detail by collapsing eleven answers into three groups, and that makes it noisy. A move from 32 to 38 on 150 responses is well within the noise, yet it often gets reported as progress. This calculator gives the margin of error for every score and tests any change against it, so you know when to celebrate and when to keep listening.
The score is the start
The number says how customers feel, not why. The follow-up question, “What is the main reason for your score?”, holds the needs and problems worth acting on. Group those answers into themes and count them, and you know what to fix first.
Free in Outcomify
Find out why they gave that score
Send a short survey to your customers for free. Outcomify turns the open answers into customer needs with counts and quotes, and splits the closed answers by your list’s columns.