Founder calculators

Open Cap Table → Model and pick Option grant or Option pool. Anyone who can view the cap table can use them. Both start from your current fully diluted count: outstanding shares plus granted options plus outstanding RSUs plus unexercised warrants plus the unallocated pool.

Can I grant X% to someone?

Enter a Target ownership (%). The calculator returns the number of new shares that would leave the person holding that percentage once those shares are added to fully diluted: shares = target ÷ (1 − target) × fully diluted, rounded down. It also says whether your option pool has enough unallocated shares to cover the grant.

For example, 1% on a fully diluted count of 9,900,000 is 0.01 ÷ 0.99 × 9,900,000 = 100,000 shares, which is 1% of the 10,000,000 that results. The share count is rounded down, so the exact percentage can sit a fraction of a share under the target. The percentage shown is rounded to two places, to the nearest, so a 2% ask reads 2.00%.

The formula assumes the grant adds to fully diluted, as a new issuance or a pool increase does. A grant taken from the existing unallocated pool leaves fully diluted unchanged, so target × fully diluted is enough in that case: 100,000 shares for 1% of 10,000,000, where the calculator would say 101,010.

How much option pool do I need?

Enter a Target pool (% of fully-diluted). The calculator returns how many shares to add so the unallocated pool is that percentage of fully diluted after the addition: shares to add = (target × fully diluted − unallocated) ÷ (1 − target), rounded down. If the unallocated pool already meets the target, it says so and adds nothing. Investors often ask for a specific pool size as a condition of a round; for a pool increase inside a round, use the pool target in the round pro forma, which sizes it against the post-round count.

What if I raise?

New money, SAFE conversions and the resulting dilution are modeled in the round pro forma, and a closed round is recorded through priced rounds.