PMF
Product-Market Fit
Also known as: Product Market Fit
The state where a product satisfies a real market demand so well that customers adopt, pay, and stay without heroic growth effort.
In depth
Marc Andreessen's definition: you know you have PMF when "the market is pulling product out of the company". Before PMF, sales feels like pushing rocks uphill. After PMF, the company can barely keep up.
Sean Ellis's test: ask users "how would you feel if this product disappeared tomorrow?" If 40%+ say "very disappointed", you have PMF. Below 40%, you don't — no amount of marketing will fix it.
Rules of thumb
- You don't have PMF until usage retention is flat at month 3+.
- Sean Ellis Test: 40%+ 'very disappointed' = PMF.
- PMF is segment-specific — one segment can have it while another doesn't.
FAQ
How long does PMF take to find?
Typical range: 1–3 years for B2B SaaS. Getting there in under a year is rare. Past 3 years without PMF usually means pivoting is smarter than persevering.
Related terms
Sources
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Last reviewed 14 April 2026 by Abhi Verma.