How to use the cap table ownership calculator
A cap table records who owns how much of a company. Enter up to six shareholders with the number of shares each one holds and the tool builds the ownership table for you. Leave a name blank and it falls back to a generic label such as Shareholder 1.
Adding the total shares outstanding from your records changes the basis: percentages are then measured against that official total and anything you have not listed shows up as an "Unlisted shares" row. Leave it blank and the holders you entered are treated as the whole company. The result panel always states which basis was used, and if the recorded total is smaller than the shares entered, the tool stops and explains why.
Enter a company valuation to add a stake value column, calculated from each displayed percentage. Options and convertible instruments are not added automatically, so include them as rows if you need a fully diluted view.
Frequently asked questions
If percentages are based only on the holders you typed in, the total always comes to 100% even when someone is missing. Entering the official shares outstanding shows how many shares are unaccounted for and calculates every percentage against the real total.
No. Each holder's percentage is rounded to two decimals for display, so the column can total 99.99% or 100.01%. When that happens the total row says the difference is rounding.
This calculator counts only the share numbers you enter. For a fully diluted view, add the option pool and any shares expected from converting notes or SAFEs as their own rows, and raise the total shares outstanding by the same amount.