Founder Equity Dilution Calculator
Understand ownership after fundraising rounds. Calculate investor percentage, founder dilution, and simulate future ownership.
Single Round Dilution
Your current ownership before this round
Amount being raised in this round
Company valuation before new investment
How many co-founders share ownership
Equity reserved for future employee stock options
Multi-Round Simulation
Simulate your ownership across 3 typical funding rounds (Seed, Series A, Series B) using realistic valuation ranges and raise percentages. Uses your current ownership and option pool settings as the starting point.
About This Tool
The Founder Equity Dilution Calculator helps startup founders understand how their ownership changes through fundraising rounds. By modeling investment amounts, valuations, and option pools, you can forecast your equity position after each round and plan your fundraising strategy accordingly.
Understanding dilution is critical for founders. Each funding round introduces new investors and potentially expands the option pool, both of which reduce your percentage ownership. However, a smaller percentage of a larger pie is often worth more — the goal is to manage dilution strategically.
For evaluating what your startup might be worth, try our SaaS Valuation Calculator to estimate your company's value based on revenue and growth metrics.
If you are considering selling your startup, our SaaS Acquisition Value Calculator can help you estimate what your business could sell for.
Explore more tools in our Business tools collection.
Key Formulas:
Post-Money = Pre-Money + Investment
Investor % = Investment ÷ Post-Money × 100
Founder New % = Current Ownership × (1 − Investor% ÷ 100) × (1 − Option Pool% ÷ 100)The option pool dilutes all existing shareholders before new investors enter, so it is applied after calculating the investor's stake but before arriving at the final founder ownership.
Key Features:
- Calculate investor ownership percentage and post-money valuation
- See founder dilution including option pool impact
- Generate a cap table showing all stakeholders
- Simulate 3 funding rounds (Seed, Series A, Series B)
- Split ownership across multiple co-founders
- 100% browser-based — your financial data stays private
All calculations are performed in your browser. No data is sent to any server, ensuring your startup financial planning remains completely private.