Equity Dilution Calculator
Founder ownership after multiple funding rounds.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Need Equity Dilution fast? Founders and operations leads use the Equity Dilution Calculator to skip the spreadsheet and get a reliable answer in one step. It's 100% free, runs privately in your browser, and the result is ready to drop into a pitch, plan or report.
About Equity Dilution Calculator
Need to work out Equity Dilution fast? This shows how a founder's ownership percentage shrinks (dilutes) across successive funding rounds. The Equity Dilution Calculator uses the standard formula — New Ownership = Current Ownership × (1 − round dilution %) — and updates the moment you type. For example, 100% ownership diluted 20% then 15% leaves about 68%. It's 100% free, private (your numbers never leave your device) and works on any device.
How to use Equity Dilution Calculator
- 1Enter your starting ownership and the dilution at each round into the calculator.
- 2The Equity Dilution is computed automatically using the formula New Ownership = Current Ownership × (1 − round dilution %) — there's no button to press.
- 3Change any input to model a different scenario, then note or copy the result.
Why use Equity Dilution Calculator?
- ✓Calculates Equity Dilution instantly with the correct formula — no spreadsheet needed
- ✓100% free and unlimited, with no sign-up, login or paywall
- ✓Runs entirely in your browser, so the numbers you enter stay private
- ✓Updates live as you type — perfect for comparing scenarios
Frequently asked questions
How do you calculate Equity Dilution?+
This shows how a founder's ownership percentage shrinks (dilutes) across successive funding rounds. The formula is: New Ownership = Current Ownership × (1 − round dilution %). For example, 100% ownership diluted 20% then 15% leaves about 68%.
Is dilution always bad?+
No — owning a smaller slice of a much larger pie can be worth far more; the goal is for valuation to grow faster than your stake shrinks.
Is the Equity Dilution Calculator free to use?+
Yes — it's completely free, with no sign-up, no login and no usage limits. You can run it as many times as you like.
Is my data private?+
Yes. The Equity Dilution Calculator runs entirely in your browser, so the figures you enter are never uploaded or stored on any server.
Embed Equity Dilution Calculator on your website
Want Equity Dilution Calculatoron your own site? Paste this snippet into any HTML page — it's free, with no API key or sign-up. The tool loads in an iframe and keeps working exactly as it does here.
<iframe src="https://tooljolt.com/tools/equity-dilution-calculator" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="Equity Dilution Calculator — ToolJolt" loading="lazy"></iframe>