Founder Dilution Across Rounds

Compounds founder ownership downward across successive financing events, multiplying retained ownership by one minus each round’s dilution. Inputs are the dilution percentages for the option pool, seed SAFEs, Series A, and Series B.

Interactive Tool

Option pool dilution

Seed SAFEs dilution

Series A dilution

Series B dilution

Founder ownership after all rounds

36%

started at 100%

Founding100%

+ Option pool82%

+ Seed SAFEs68%

+ Series A50%

+ Series B36%

Dilution compounds: each round's percentage is taken on a base that already includes every prior round, so a string of ordinary rounds carries founders from 100% to a minority stake faster than the individual numbers suggest.

Learn the concept

This calculator comes from the free Entrepreneurial Finance course, where the concept is taught with readings, worked examples, and practice questions.

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Built by Devon Coombs, CPA, MBA, Teaching Professor of Finance at Santa Clara University.