Fair equity split between co-founders. The Founder Equity Split Calculator takes founder a: weekly hours, founder b: weekly hours, founder a: capital contributed, founder b: capital contributed, weight given to time, weight given to capital and returns founder a equity plus founder b equity, founder a share of time, founder a share of capital. 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 Founder Equity Split Calculator works
A structured split weighs what each founder actually contributes rather than defaulting to 50/50. Add weights for the idea, experience or network if they matter, and vest the result over four years.
Worked example
With the example values (founder a: weekly hours of 40 hours, founder b: weekly hours of 20 hours, founder a: capital contributed of $20,000, founder b: capital contributed of $5,000, weight given to time of 60%, weight given to capital of 40%), the founder a equity is 72%; founder b equity 28%, founder a share of time 66.67%, founder a share of capital 80%. 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 founder a equity calculated?
equity share = time weight × share of hours + capital weight × share of capital.
Which figures do I need?
Founder a: weekly hours, founder b: weekly hours, founder a: capital contributed, founder b: capital contributed, weight given to time, weight given to capital. 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.
