Dilution Simulator
Model how each funding round dilutes your ownership. See your cap table and understand what you'll own at exit.
Every funding round dilutes founder ownership. You know this intellectually, but seeing it happen round-by-round can be shocking. One founder raises Seed at $5M and owns 80% after dilution. Series A dilutes them to 60%. Series B to 45%. By exit, they own less than they thought they negotiated for.
This dilution simulator lets you model exactly what happens to your ownership at each stage. You'll see your founder percentage, investor percentage, option pool size, and a visual cap table breakdown. More importantly, you'll understand the compounding effect of multiple rounds and can make informed trade-offs: Do you raise capital faster at lower valuations, or wait to raise at higher valuations to minimize dilution? This calculator shows you the math so you can decide.
Simulate Your Dilution
Understanding Your Cap Table Breakdown
Your cap table after a funding round has three main components: founder equity (your ownership after dilution), investor equity (the percentage the new investors own), and option pool (reserved for employee stock options). The visual breakdown above shows these three slices. As you raise more capital, the pie stays the same size (100%) but your slice gets smaller, the investor slice gets bigger, and the option pool may expand.
Typical Dilution Per Round
Dilution varies based on your valuation and check size. A lower valuation or larger check means more dilution. Here are typical ranges from market data (2024-2026):
The Dilution Equation
Your new ownership percentage equals your old ownership multiplied by the ratio of remaining shares after investor dilution. In formula terms:
New Founder % = Old Founder % × (100% - Investor % - Option Pool %)
If you own 100%, investors take 20%, and option pool is 10%, you end up with 100% × 70% = 70%.
How Option Pool Affects Dilution
Option pools are created or expanded at each round to give you shares to grant to employees. A typical option pool is 10-20% of fully diluted shares. When you create or expand the pool, you dilute existing shareholders (including founders) proportionally. So if you're at 100% and create a 10% option pool, you immediately drop to ~90% even before new investors buy in.
This creates a decision: do you negotiate the option pool size with your investors (most founders prefer smaller pools to minimize dilution) or accept standard market sizes? Most investors will expect a 10-15% option pool by Series A.
Founder Ownership Through Exit
A healthy founder ownership percentage through exit is 15-30%, depending on how many rounds you've raised. Here's why: early-stage startups need multiple rounds of capital. Each round dilutes everyone. But the company is worth more with each round, so your smaller percentage is of a much larger company.
Example Path:
- Start: 100% ownership, $0 company value
- After Seed (20% dilution): 80% ownership, $5M post-money valuation
- After Series A (25% dilution): 60% ownership, $25M post-money valuation
- After Series B (20% dilution): 48% ownership, $100M post-money valuation
- At exit ($500M): 48% × $500M = $240M payout
Your ownership percentage dropped from 100% to 48%, but your dollar value increased from $0 to $240M. This is why dilution matters less than the value of the company—you're trading ownership percentage for capital to grow faster.
Common Dilution Mistakes
Underestimating Cumulative Dilution
Founders often focus on the dilution in the round they're raising (e.g., "I'm only diluted 20%") without thinking about the full path to exit. After Seed, Series A, and Series B, you might be at 30-40% ownership even if each individual round was 15-25% dilution. Plan for this.
Not Negotiating Option Pool Size
Option pools are often taken for granted at "market standard" 10-15%. But you can negotiate. If you're in a competitive talent market, you might need 15-20%. If you're in a less competitive area, 7-10% might be sufficient. Every percentage point of option pool you avoid is ownership you keep.
Raising Too Much Capital Too Early
Some founders raise massive Seed rounds to avoid Series A. But a $5M Seed raises dilutes you more than a $1.5M Seed + bigger Series A. Raise what you need, when you need it. Extra cash sitting in the bank is expensive in terms of dilution.
Ignoring Pro-Rata Dilution in Future Rounds
After Seed, investors often have pro-rata rights to maintain ownership in later rounds. This means they'll invest more in Series A to stay at the same percentage. Your ownership might stay flat or increase slightly in absolute terms, but you still own a smaller piece of a bigger pie.
When You Should Care About Dilution
Dilution matters for founder motivation, control, and exit economics. If you're down to 10% ownership, your $500M exit nets you only $50M—decent, but disappointing. But if your company is worth $500M and you own 20%, you're getting $100M. The difference is meaningful. Plan your raise strategy to maintain healthy founder ownership through exit.
Frequently Asked Questions
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