Equity Dilution Calculator
Model dilution by share issuance or by investment round and see exactly how much of the company you keep.
Inputs
New ownership
20.83%
From 25.00% — you retain 83.33% of your stake.
Dilution
4.17%
Before / After / Change
| Metric | Before | After | Change |
|---|---|---|---|
| Ownership | 25.00% | 20.83% | −4.17% |
| Your shares | 2,500,000 | 2,500,000 | 0 |
| Total shares | 10,000,000 | 12,000,000 | +2,000,000 |
Dilution by shares: new ownership = (your shares ÷ (total + new shares)) × 100. Dilution by round: new ownership = current ownership × (pre-money ÷ post-money).