What is the Sean Ellis PMF test?

The Sean Ellis test asks users: "How would you feel if you could no longer use this product?" If 40% or more answer "Very disappointed," you have product-market fit. Below 25% means you have significant work to do. Between 25-40% means you are close but need to sharpen your value proposition.

How many survey responses do I need for PMF?

Aim for at least 40-50 responses from users who have experienced the core value of your product (not just signed up). Segment by user type — power users will skew higher, casual users lower. The 40% threshold should hold across your core segment.

🎯Interactive Tool

Product-Market Fit Calculator

Measure product-market fit using the Sean Ellis test. Survey your users and enter the response counts below to see if you've achieved PMF.

The Sean Ellis Test

Ask your 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.

Very Disappointed

The key metric for PMF

Somewhat Disappointed

See value but could switch

Not Disappointed

Don't find it essential

N/A

No longer using / never used

Enter Survey Responses

Very Disappointed

Somewhat Disappointed

Not Disappointed

N/A

PMF Benchmarks

40%+

Product-Market Fit achieved — Focus on growth and scaling

25-39%

Getting close — Iterate on the core value proposition

Below 25%

Not yet — Go back to discovery — talk to users, find the real pain

Product-Market Fit Guide

Learn how to find, measure, and maintain product-market fit with the PMF Engine framework.

NPS Calculator

Measure customer satisfaction with the Net Promoter Score.

Continue your workflow

NPS Calculator

Deeper satisfaction data

Feature Adoption

Which features stick?

Map Journey

Find where users get stuck

Measuring Product-Market Fit

Product-market fit is the moment when your product satisfies a strong market demand. The Sean Ellis survey is the most widely used quantitative test: if 40%+ of users would be "very disappointed" without your product, you've found fit. This calculator makes it easy to enter survey responses and see where you stand.

Related Metrics

PMF correlates with other health signals. Products with strong PMF typically show high NPS scores, low churn rates, and strong customer lifetime value. If your PMF score is below 40%, focus on understanding your "very disappointed" users, then iterate to make more users feel that way. See our PMF strategy guide for the full playbook.