Net Promoter Score Impact Modeler
Turn promoter and detractor mix into referral pipeline and NPS.
An NPS of 30 turns your 900 promoters into roughly 180 organic referrals, a growth loop that costs nothing. Detractors are the counterweight, closing their loop protects the referral engine.
NPS predicts word-of-mouth, not just satisfaction. Promoters lower CAC via referrals; detractors quietly raise it by warning others off. Both feed straight into unit economics.
About this calculator
Net Promoter Score is usually reported as a bare number, but it's really a growth-loop input: promoters refer people, detractors warn them off, and both feed straight into your CAC and pipeline. This modeler converts your customer base's promoter and detractor split into an NPS score and estimates the organic referral pipeline your promoters actually generate.
How to use it
- Enter your customer base or survey sample size.
- Enter the percentage who are promoters (survey scores 9-10) and the percentage who are detractors (scores 0-6).
- Enter referrals per promoter, the share of promoters who refer someone else.
- Read your NPS score, its rating band, the number of referrals generated, and net advocacy in raw customer counts.
Methodology
NPS is calculated as promoter percentage minus detractor percentage, the standard NPS formula, note it deliberately ignores passives (scores 7-8), they don't appear anywhere in this calculation, only promoters and detractors are counted.
Promoters and detractors in absolute counts are the customer base times their respective percentages. Referrals generated is promoter count times the referral rate, an estimate of organic pipeline sourced purely from word of mouth. Net advocacy is promoters minus detractors in raw customer counts, the same subtraction as NPS but expressed as people rather than a percentage-point score.
The tool bands NPS into four tiers: 50+ is excellent, 30-49 is good, 0-29 is graded "needs work", and below zero is negative, commonly cited benchmark ranges for interpreting an NPS score across industries.
This model assumes a flat referral rate per promoter and doesn't account for detractors actively discouraging prospects (negative word of mouth), which the verdict text acknowledges qualitatively when detractors outnumber promoters, but isn't quantified into the referral or ARR figures.
FAQ
That's how NPS is defined: it's deliberately a measure of the gap between actively enthusiastic and actively unhappy customers, passives are treated as neutral and excluded from both the numerator and denominator of the score itself, even though they're part of the surveyed base.
NPS is a sentiment score, a snapshot of how customers feel. Referrals generated translates that sentiment into an estimated pipeline number, promoter count times your referral rate, giving you a tangible growth-loop figure to weigh against paid acquisition costs, rather than just a satisfaction metric.
This tool treats 50+ as excellent and 30-49 as good, in line with commonly used industry bands, though the "right" target varies by category, some B2B software categories see healthy scores in the 20s-40s, while some consumer categories expect higher. Track your trend over time as much as the absolute number.
Only qualitatively, the verdict text flags it when detractors outnumber promoters, but the referral and pipeline figures don't subtract a negative word-of-mouth effect. In reality, detractors can raise CAC by discouraging prospects, a real cost this calculator doesn't quantify directly.