Free tools
Cap table and dilution calculators
Quick, deterministic calculators for the questions founders and investors ask most. They run entirely on the numbers you type — nothing is stored, and no company data is used.
Dilution calculator
Enter your fully diluted share count, the pre-money valuation, the amount being raised and any option pool increase. The calculator returns the price per share, the shares issued, and your ownership before and after the round.
SAFE calculator
Model the conversion of a SAFE at a priced round. The calculator compares the cap-implied price with the discounted round price and converts at the lower of the two, then shows the resulting ownership and dilution.
Option pool calculator
Work out how many new option shares are needed to reach a target unallocated pool after a round — and how much of that increase existing holders absorb, depending on whether the pool is created pre-money or post-money.
Pre-money / post-money calculator
The core round arithmetic, in both directions: from a pre-money valuation and an investment to the post-money valuation and ownership split, or from an agreed post-money valuation back to the implied pre-money.
Founder ownership calculator
Start from your founding split and walk forward: an option pool, a SAFE that converts, then Seed, Series A and Series B. Each stage shows the founder position after it, so you can see where ownership actually goes.
Secondary share sale calculator
A pure secondary transfer creates no new shares, so other holders are not diluted. This calculator shows what does change: the seller's remaining position, the buyer's new position and the gross proceeds.