St. Clair Studios

Unit Economics

Testing version · v0.1

Do the numbers actually work?OTS

The four numbers investors ask for first: what it costs to win a customer, what that customer is worth, the ratio between them, and how fast you make your money back. Adjust the inputs; results update live.

Your inputs

Use one consistent period (usually a month). Rough estimates are fine.

Revenue per customer

Avg. revenue per customer (/mo)

Gross margin (%)

Retention

Retention basis

Lifespan (months)

Acquisition

Sales & marketing spend (period)

New customers won (same period)

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Your unit economics

LTV:CAC ratio — the headline number.

LTV : CAC ratio

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Enter your numbers to see the verdict.

CAC (cost to acquire)

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LTV (lifetime value)

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CAC payback

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Gross profit / customer

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The rules of thumb: an LTV:CAC of 3+ is healthy, and you want to pay back CAC in under 12 months.

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