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Free Calculator

Equity Dilution Calculator

See how a new funding round affects your ownership percentage — enter your stake, pre-money valuation, and amount raised.

Runs entirely in your browser — free, private, no sign-up.

Questions answered

Frequently asked questions

Everything you might be wondering about the Equity Dilution Calculator.

How does a funding round dilute my ownership?
When new shares are issued to investors, your existing shares stay the same in number but represent a smaller percentage of the now-larger total. Post-money valuation = pre-money + amount raised.
What is the difference between pre-money and post-money valuation?
Pre-money is the company’s value before the new investment. Post-money is pre-money plus the new cash raised. Your new ownership % = (your current % × pre-money) ÷ post-money.
Is it free and private?
Yes — it runs entirely in your browser, free, with nothing uploaded.
See it in action

A worked example

Real input, real output — so you know what to expect before you run it yourself.

Quick example
Sample input
20% ownership, $4M pre-money, $1M raised
Sample output
Post-money $5M — new ownership 16%, diluted 4 points.
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