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Free founder dilution tool

Know exactly how much ownership you give up before signing the round.

Calculate investor stake, founder dilution, post-money valuation, share issuance and ESOP pool impact. Compare one or two funding rounds in a single cap table.

Founder dilution Investor stake ESOP pool impact
Planning model only. Actual ownership depends on the agreed fully diluted capitalization, option pool timing, convertibles, preferences and transaction documents.
Startup funding dilution calculator

Model post-money ownership and cap table

Live cap table
Funding round 1 Primary investment
Optional funding round 2 Future dilution scenario
Ownership after each stage Founders, ESOP and investors
Critical term: A pre-money ESOP top-up usually dilutes existing holders more than the new investor. All calculations run locally

Dilution is not just the investor percentage. It is the full capitalization impact.

A funding round can dilute founders through both investor shares and an expanded option pool. The timing of the pool matters. Founders should model the fully diluted cap table across multiple rounds before agreeing to headline valuation terms.

Round economics

Pre-money and post-money

See how investment changes valuation and determines headline investor percentage.

Founder control

Ownership dilution

Measure the reduction in founder percentage after investor shares and ESOP changes.

Employee equity

Option pool impact

Compare the effect of creating the ESOP pool before or after funding.

Future planning

Multiple-round scenario

Estimate ownership after a future round before accepting the first investment.

Frequently asked questions

In a simple primary round, investor percentage is investment divided by post-money valuation. Convertibles, warrants and pool top-ups can change the result.

A pre-money pool expansion is generally borne more heavily by existing shareholders. A post-money pool shares more dilution with the new investor.

No. This calculator models percentage ownership only, not economic preference, anti-dilution or exit waterfalls.

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