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Product-Market Fit Calculator

Enter your Sean Ellis test results below. If 40% or more of your users say they would be "very disappointed" without your product, you have product-market fit.

How This Calculator Works

The Product-Market Fit calculator uses the Sean Ellis test, the most widely adopted method for measuring PMF. You ask your users one question: "How would you feel if you could no longer use this product?" and record their answers.

The PMF score is the percentage of users who answer "Very disappointed." Sean Ellis found that companies with 40%+ on this metric consistently grow successfully, while those below 40% struggle to sustain growth.

This calculator takes your raw response counts, calculates the PMF score, and compares it against known benchmarks from companies like Superhuman, Slack, and Notion.

The Formula

PMF Score = (Very Disappointed Responses / Total Responses) x 100

For example, if 45 out of 100 users say "Very disappointed," your PMF score is 45%. That is above the 40% threshold, indicating product-market fit.

The threshold of 40% comes from Sean Ellis analyzing hundreds of startups. Companies above 40% almost always find sustainable growth. Companies below 25% typically need to rethink their core value proposition.

How to Interpret Your Results

40% or above: You have product-market fit. Focus on growth, distribution, and scaling what works. Your users genuinely need your product.

25% to 39%: You are getting close. Talk to the users who said "Very disappointed" to understand what they love. Double down on that and cut features that dilute it.

Below 25%: You have not yet found product-market fit. Before investing in growth, go back to understanding your users. Run more research to find what your target audience actually needs.

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Frequently Asked Questions

Product-market fit means you have built a product that your target market genuinely wants and needs. It is the point where your product satisfies strong market demand, leading to organic growth and retention.
The Sean Ellis test asks users: "How would you feel if you could no longer use this product?" If 40% or more say "Very disappointed," you have product-market fit. Sean Ellis developed this metric after analyzing hundreds of startups.
Aim for at least 40-50 responses from active users who have used your product enough to form an opinion. More responses give more reliable results, but even 30 responses can provide directional guidance.
A score below 40% means you should focus on understanding your users better before investing in growth. Talk to the users who said "Very disappointed" to learn what they love, and focus your product on that specific value.
Yes. The Sean Ellis test works for both B2B and B2C products. For B2B, make sure you survey the actual users of your product, not just the buyers or decision-makers.
Measure PMF after each major product change or at least quarterly. Tracking your score over time helps you understand if product changes are moving you toward or away from fit.

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