Ownership Percentage Calculator

Frequently Asked Questions

• What should I use for “total fully diluted shares” (and why not just outstanding shares)? +

  Use the fully diluted share count from your latest cap table: outstanding shares plus shares that could be created from options, warrants, and other convertibles. This is the ownership percentage most investors and finance teams rely on.

• I only know my ownership % (not my share count). Can I still use this calculator? +

  Not directly—this tool needs your shares. Pull your share count from your equity grant/stock certificate and your fully diluted total from the cap table. If you only have %, ask whoever maintains the cap table for the underlying numbers.

• Why does my ownership % differ from what my cap table shows? +

  Common reasons: you’re comparing undiluted vs fully diluted, the cap table includes an unallocated option pool, you’re using an older share count, or you’re mixing share classes/conversion assumptions.

• How do I model dilution from a new funding round or option pool increase? +

  This calculator answers “what % do I own today?” To model “what happens after new shares are issued,” use an Equity Dilution / Post-round Ownership calculator where you add the new shares (and any option pool refresh) to the denominator.