See how a round, option pool and SAFE stack dilute founder ownership before you sign.
The form starts with a sample seed round. Calculate as-is, or enter your own cap table first.
Option pools and converting SAFEs can move more ownership than founders expect.
Pre-money pool increases are usually paid by existing holders before the new money comes in.
A capped SAFE converts into real ownership at the priced round.
Small valuation changes can move founder ownership by meaningful points.
The model normalizes the current cap table, converts SAFEs, applies the option pool and issues new investor ownership.
# core components post_money = pre_money + new_raise new_investor = raise / post_money safe = safe_amount / min(safe_cap, pre_money) pool_increase = max(target_pool - current_pool, 0) founder_after = normalized remaining ownership
This is a fast modelling tool, not legal advice.
Real documents can change conversion mechanics; confirm before signing.
New money dilution is just one line in the after table.
A pre-money pool is a founder cost unless negotiated otherwise.
They may have been signed months ago, but they convert now.
Most priced rounds land around 15-25% dilution for new money before pool and SAFEs. Pool increases and converting SAFEs can make total founder dilution higher.
A pre-money pool is created before investment, so existing holders absorb it. A post-money pool spreads the cost across everyone, including the new investor.
This calculator models converting SAFEs as one combined amount and cap for a fast estimate. Use the SAFE calculator for one instrument in detail.