Startup Dilution Calculator
Who owns what. Without the legal fees.
Dilution is the drop in your ownership when a company issues new shares: your ownership percent equals your shares divided by the total shares after the round. Your share count does not change, but the total grows, so your slice shrinks. Own 100% before a €250,000 round at a €1,000,000 pre-money valuation and you hold 80% after, because the new shares expand the total.
How it's calculated
Two steps, both pure share counting:
- Total shares = sum of every holder's shares
- Ownership % = your shares / total shares x 100
A priced round issues new shares at the round price (pre-money valuation / existing shares). Those shares raise the total, so every existing holder's percent falls. For a solo founder who starts at 100%, ownership after the round is pre-money / (pre-money + raise) x 100.
Worked examples
| Raise | Pre-money | Founder % after |
|---|---|---|
| €250,000 | €1,000,000 | 80.0% |
| €1,000,000 | €3,000,000 | 75.0% |
| €2,000,000 | €4,000,000 | 66.7% |
How it works
Add shareholders to the list, one row each.
Pick a role (Founder, Investor, Employee, or Pool) and type the number of shares.
The ownership bars and total update as you type. Use the × at the end of a row to remove a shareholder.
Why it matters
Equity is the most expensive currency you have. Giving it away without understanding the dilution impact is a common founder mistake.
This tool gives you a quick snapshot of your cap table so you can negotiate with clarity.