Equity Dilution Calculator

Market demand

Are buyers already searching for this problem?

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

See how your ownership stake shrinks across multiple funding rounds, and what each round is worth to you.

Raise amount£

Pre-money valuation£

Raise amount£

Pre-money valuation£

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%

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.

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

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.

Validate this idea before building

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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.