Equity Dilution Calculator
Enter your cap table, model up to three funding rounds with option pool top-ups, and see exactly what each holder owns before and after every round. Everything runs in your browser — nothing is uploaded.
About this tool
This calculator uses the standard venture math where the option pool top-up is created as part of the round and counted in the post-money fully diluted share count — the way most term sheets are written. That means the pool dilutes existing holders, not the new investor, which is why founders often end up owning less than a naive "investment ÷ post-money" estimate suggests. Every formula is printed above so you can audit the numbers by hand.
It is a modeling aid, not legal or financial advice: real rounds involve SAFEs, liquidation preferences, pro-rata rights, and conversion mechanics this simple model ignores. Your cap table never leaves the page — there is no server, no upload, and no tracking of tool inputs.