Equity Dilution Calculator
Ownership after a funding round.
Enter your values
Enter the your ownership in %.
Enter the pre-money valuation in $.
Enter the amount raised in $.
Enter the new option pool in %.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Ownership after round
- 10.8%
- Before option pool
- 12%
- Dilution suffered
- 4.2%
- Post-money valuation
- $10,000,000.00
- Value of your stake
- $1,080,000.00
Quick answer
New shares issued to investors dilute existing holders proportionally, though value can still rise if the valuation grows.
New % = Old % × (Pre ÷ Post money)
At a glance
| What it does | Ownership after a funding round. |
|---|---|
| Category | Business |
| Inputs needed | Your ownership, Pre-money valuation, Amount raised, New option pool |
| Main output | Ownership after round |
| Formula | New % = Old % × (Pre ÷ Post money) |
| Cost | Free — no sign-up, no download |
How to use the Equity Dilution Calculator
- 1Enter your current ownership percentage.
- 2Enter the pre-money valuation and raise amount.
- 3Add any new option pool created at close.
Inputs explained
- Your ownership(%)
- Enter the your ownership in %.
- Pre-money valuation($)
- Enter the pre-money valuation in $.
- Amount raised($)
- Enter the amount raised in $.
- New option pool(%)
- Enter the new option pool in %.
Worked example
Using the values the calculator loads with:
Inputs
- Your ownership15 %
- Pre-money valuation8000000 $
- Amount raised2000000 $
- New option pool10 %
Results
- Ownership after round10.8%
- Before option pool12%
- Dilution suffered4.2%
- Post-money valuation$10,000,000.00
- Value of your stake$1,080,000.00
Frequently asked questions
Is dilution always bad?
No — a smaller slice of a much larger pie is usually worth more.
Who pays for the option pool?
Usually existing shareholders, because it is created pre-money.
What do I need to enter into the Equity Dilution Calculator?
Just 4 values: your ownership, pre-money valuation, amount raised, new option pool. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Equity Dilution Calculator work out the answer?
New shares issued to investors dilute existing holders proportionally, though value can still rise if the valuation grows. It applies the formula New % = Old % × (Pre ÷ Post money) and shows the working so you can check each step by hand.
Is the Equity Dilution Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.