My ownership % after new rounds. The Equity Dilution Calculator takes your ownership today, new shares issued in the round (share of post-round total), new option pool created (share of post-round total) and returns your ownership after the round plus dilution suffered, relative reduction in your stake. Results update as you type, and the formula is shown under the result so you can repeat it in your own spreadsheet.
Startup metrics are about the efficiency of growth: how much it costs to win and keep customers, how fast recurring revenue compounds, and how long the cash lasts. Investors read these numbers before they read the pitch. Use the worked example below to check the maths against your own figures.
How the Equity Dilution Calculator works
Every round dilutes existing holders by the share of the company the new shares (and any new option pool) represent. A 40% founder stake becomes 30% after a round that issues 20% plus a 5% pool.
Worked example
With the example values (your ownership today of 40%, new shares issued in the round (share of post-round total) of 20%, new option pool created (share of post-round total) of 5%), the your ownership after the round is 30%; dilution suffered 10%, relative reduction in your stake 25%. Change any figure above and the result updates immediately; use Copy results to paste the summary into a note or email.
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Frequently Asked Questions
How is your ownership after the round calculated?
ownership after = ownership before × (1 − new shares % − option pool %).
Which figures do I need?
Your ownership today, new shares issued in the round (share of post-round total), new option pool created (share of post-round total). Take them from the same period and the same set of accounts or reports so the ratio is consistent, and check the example values as a guide to the units expected.
What do investors consider healthy?
Common benchmarks: LTV:CAC above 3, CAC payback under 12–18 months, net revenue retention above 100%, monthly churn under 2% for SMB and under 1% for enterprise, and at least 12–18 months of runway.
