What's your product-market fit score?
Plug in your Sean Ellis survey responses and see your PMF score instantly — measured against the 40% rule that separates startups that take off from startups that stall.
Calculate my score ↓ Free · No signup · Based on the Sean Ellis 40% methodologyvery disappointed ÷ total valid responses × 100What your score actually means
The 40% line isn't arbitrary. Sean Ellis found it by surveying nearly a hundred startups: the ones above it had a clear path to growth, the ones below struggled no matter how hard they pushed on marketing. Here's how to read where you land — using the most famous trajectory in PMF history.
Below the line — and easy to give up here. Instead, a starting baseline to improve. A low score is a to-do list, not a verdict.
Product-market fit. A meaningful slice of users depend on you. Growth investment starts to pay back instead of leaking out as churn.
Strong, must-have territory — past Slack's ~51%. Products here grow by word of mouth because users can't shut up about them.
Superhuman didn't get lucky — they engineered 22% up to 58% with a repeatable loop. See exactly how they did it →
A score you calculate once is already out of date
This calculator gives you a number today. But product-market fit isn't a moment you reach — it's a number that moves. A pivot, a redesign, or a flood of the wrong users can quietly drag your score back down while your dashboard still looks fine.
The founders who keep fit treat it like revenue: a metric they watch on a cadence. The problem is that re-running the survey by hand — Typeform, CSV export, a spreadsheet to calculate, a slide for investors — is miserable enough that most founders do it once and never again. Which defeats the entire point.
PMFtracker runs this loop for you with a simple Collect → Track → Act workflow, so the score becomes a trend you can actually watch.
Survey widget you embed
Drop the PMFtracker widget into your product, set up the Sean Ellis survey, and collect responses in 48–72 hours.
PMF score on the 40% rule
Calculated automatically, with historical trend analysis and forecasting — not a one-off number.
Automated alerts
Get notified the moment your score moves significantly, so you catch fit slipping before it's a crisis.
AI segmentation & sentiment
Automated customer segmentation plus AI-powered sentiment analysis surfaces your ICP and what to fix.
PostHog Cohorts + imports
Target exactly the right users to survey via PostHog Cohorts, or import data from your existing survey tools.
Investor-ready reports
Package the trend, the ICP, and what users would miss into evidence that eases your next raise.
"To increase your product-market fit score, spend half your time doubling down on what users already love, and the other half addressing what holds others back."— Rahul Vohra, Founder & CEO of Superhuman
Track your PMF score over time — not just once
Get your baseline in five minutes, then watch the number climb. PMFtracker turns this calculator into a living dashboard your team and investors can trust.
Start your free trial → 2-week free trial · No credit card · Pay once, measure forever — no subscriptionFrequently asked questions
How is the PMF score calculated?
It's the percentage of valid respondents who'd be "very disappointed" without your product: very disappointed ÷ total valid responses × 100. Only "very disappointed" counts toward the score.
What is a good PMF score?
40% or higher is the Sean Ellis benchmark for product-market fit. Above 50% is strong, must-have territory. Below 40% means you're not there yet — but the survey data tells you who to build for.
What counts as a valid response?
Answers from engaged users who chose very, somewhat, or not disappointed. Exclude anyone who picked "N/A — I no longer use it," since they've already churned and would skew your score downward.
How many responses do I need?
At least 40 give a directional read; 100+ give a reliable score you can put in front of investors. Don't wait for a big user base — start as soon as you have ~40 engaged users.
Who should I survey?
Engaged users only — people who used the core of your product at least twice in the last two weeks. Here's the full step-by-step on running the survey.
