measuring-pmf

Measure product-market fit by triangulating three signals: cohort retention curves that flatten above zero, a Sean Ellis survey score of 40%+ users who would be very disappointed without the product, and sustained organic word-of-mouth growth rather than marketing-driven spikes.

A Sean Ellis score of 40% or more respondents answering 'very disappointed' if the product disappeared indicates product-market fit. Some teams set stricter thresholds of 50%, and scoring benchmarks may need adjustment for regional cultural biases in survey responses.

Six-month retention benchmarks vary by model: consumer social is good at ~25% and great at ~45%, consumer SaaS is good at ~40% and great at ~70%, SMB SaaS is good at ~60% and great at ~80%, and enterprise SaaS is good at ~70% and great at ~90%.

The median time from idea to feeling product-market fit is roughly two years for B2B startups, including 9-18 months of iteration after launching a working product. Start worrying if two years pass without PMF signals, and seriously worry after three years.

Real market pull shows as urgent customer questions about pricing and implementation, organic growth without founder involvement, and customers paying before being asked. False signals include polite interest, investor checks, and deals closed through founders' personal relationships.

Scale only after cohort retention curves flatten above zero and quantitative thresholds like the Sean Ellis score are met. Scaling headcount or marketing spend before retention stabilizes leads to high burn and eventual failure.