Startup fundraising math without the spreadsheet fog.

FounderMath is a static-first utility site for founders who need fast educational estimates for valuation, dilution, and SAFE conversion scenarios.

Calculator topic hubs

Estimate pre-money, post-money, investment ownership, and simple percent-sold math.

Model SAFE conversion scenarios and future financing terms with transparent assumptions.

Understand founder dilution and cap table changes from financing rounds and option pools.

Enter pre-money and post-money valuations to estimate the percent sold, without share inputs.

Translate between investment amount, valuation, ownership, and optional share counts.

Estimate the conversion price and shares from valuation caps and discounts.

See how new money and option pool top-ups reduce founder ownership.