YC Co-founder Paul Graham: 40% Weekly Growth for Startups
Paul Graham stated that when inquiring about the growth rate of a startup today, the response indicated that the current figures are meaningless due to a spike from a new product launch, but prior to the spike, the growth rate was 40% per week.
He calculated that 1.4 raised to the power of 52 is approximately 39.7 million times, which clearly cannot be sustained long-term, but indicates that users like the product.
High growth validates product-market fit, benefiting early startup teams and investors, but the unsustainable rate will eventually return to normal trajectories.
Source: Public Information
ABAB AI Insight
Paul Graham has long emphasized weekly growth rates as a core metric during YC office hours, repeatedly noting that a 5-7% weekly growth is good, and 10% is excellent, using this to filter projects with real demand.
On the capital path, YC resources prioritize teams that can demonstrate user-driven growth, motivated by using compound growth mathematics to filter scalable companies rather than relying on marketing spikes.
Similar cases can be seen with early Dropbox and Airbnb achieving sustained weekly growth through high retention, and many projects failing due to stagnation after spikes; current startup mentoring is shifting from vanity metrics to sustainable user validation.
Essentially, this is a technological substitution: marketing-driven short-term spikes are replaced by the genuine appeal of the product, with the mechanism being that compound growth reveals whether users truly need the product.
ABAB News · Law of Cognition
Spikes are not growth; the baseline is.
40% weekly growth proves preference, but math will punish.
Product strength ultimately speaks through compounding.