Equity Dilution Calculator
Estimate ownership after a new issuance.
Calculate equity dilution calculator from clear inputs
Equity Dilution Calculator gives a focused worksheet for finance & money questions where a quick deterministic estimate is more useful than a spreadsheet. The equity dilution calculator fields mirror the variables in its formula, and the output separates the main result from supporting values so you can sanity-check this calculation before reusing it.
With 1000000 current shares and 250000 new shares, 600000 founder shares become 48 percent ownership.
Keep the estimate private in your browser
For Equity Dilution Calculator, every calculation runs in your browser with no upload, account, cookie, live lookup, or server-side storage. The equity dilution calculator result is best treated as a planning number because the real-world constraints behind this estimate can change the answer. Adjust the equity dilution calculator assumptions and confirm important decisions against the relevant source of truth for that exact situation.
Frequently Asked Questions
How is ownership after issuance calculated?
Founder shares ÷ (current shares + new shares). 600,000 founder shares out of 1,000,000 is 60%, and issuing 250,000 new shares drops that to 48%.
What does "dilution from old percent" mean?
The drop in percentage points, here 60% to 48%, or 12 points. In relative terms that is a 20% dilution of the founder's stake.
Does dilution mean my shares lose value?
Not necessarily. If new money raises the company's valuation, a smaller percentage of a bigger company can be worth more than before.
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