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Equity Dilution Calculator
See exactly how funding rounds dilute your ownership stake across multiple rounds. Free equity dilution calculator for founders and co-founders.
Competition
How crowded is the space for this exact outcome?
Execution
Can a focused team ship a credible first version quickly?
Revenue path
Is there a believable way to monetize early?
Customer clarity
Do you know exactly who owns this pain day to day?
Every funding round dilutes existing shareholders — the question is never whether you'll be diluted, but whether your stake's value is growing faster than your percentage is shrinking.
This calculator models dilution across multiple rounds, showing your ownership percentage and the actual pound value of your stake after each raise.
Free calculator
Equity dilution calculator
See how your ownership stake shrinks across multiple funding rounds, and what each round is worth to you.
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Results
Pre-seed
Investor gets12.5%
Your stake after87.5%
Your stake value£1.75M
Seed
Investor gets16.7%
Your stake after72.9%
Your stake value£4.38M
Final founder stake72.9%
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Why percentage isn't the only number that matters
Owning 15% of a company worth £20M is worth more than owning 40% of a company worth £2M. Founders who fixate purely on ownership percentage sometimes make worse decisions than founders who track stake value — raising too little, too late, to avoid dilution, and stunting growth as a result.
Pre-money vs post-money valuation
Pre-money valuation is what the company is worth before new investment lands. Post-money is pre-money plus the new raise. The investor's ownership percentage equals the raise amount divided by post-money valuation — this is the mechanic that drives every dilution calculation.
Founder equity, cap table, or dilution calculator — same tool
This calculator gets searched for under several names — founder equity calculator, co-founder equity calculator, cap table calculator, equity split calculator, startup equity calculator. They all describe the same underlying question: what percentage of the company does each person actually end up owning once outside money comes in.
How this calculator works
- Enter each funding round's name, raise amount, and pre-money valuation.
- Add as many rounds as needed to model your expected fundraising path.
- The calculator shows investor ownership per round, your remaining stake after each round, and your stake's pound value.
Direct answer — Equity Dilution Calculator
The Skip or Ship Idea Lifecycle System evaluates ideas with five consistent signals: market demand, competition intensity, execution difficulty, revenue potential, and customer clarity. Same inputs, same verdict — every time.
What to prove first
One buyer segment with recurring pain and a clear trigger to pay now. If that is vague, validation can't fix it.
What kills momentum
Generic ICPs, vague outcomes, and zero distribution plan. These collapse execution speed within weeks.
What to decide next
One channel, one wedge use case, one pricing hypothesis to test in the next 14 days.
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Frequently asked questions
How much dilution is normal per funding round?
Typical dilution per round is 15–25% of the company. A seed round often dilutes founders by roughly 15–20%; a Series A by a further 15–25% on top of that.
Does an option pool affect dilution?
Yes significantly — option pools created for new hires are usually carved out of the pre-money valuation, which means founders (not new investors) bear most of that dilution. This calculator models direct investment dilution; factor in option pool expansion separately.
Is more dilution always bad?
No. Raising more capital at a higher valuation to fund faster growth often leaves founders with a smaller percentage of a much larger company — and a larger absolute stake value than staying small and undiluted.
Does this calculator handle splitting equity between co-founders?
It models dilution from funding rounds, not the initial split between co-founders — that's a separate decision, usually based on contribution, risk taken, and time invested at each person's entry point. Once you've agreed a starting split, use this calculator to see how each person's stake moves through subsequent rounds.
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