Keep gross profit per customer and acquisition costs on compatible cohort and period bases. The download provides a specific review process. It does not make decisions or act in an account.
Download the free skill
One complete Markdown file. No subscription, checkout or fabricated setup files.
Download SKILL.mdWhat to provide
Approved CAC, monthly revenue per customer, gross margin, cohort definitions and currency.
How it works
- Match CAC and monthly margin to the same cohort and currency.
- Calculate monthly gross profit from approved revenue and gross margin.
- Divide CAC by positive monthly gross profit. Missing or nonpositive margin blocks simplified payback.
- Return inputs and retention caveats. Do not make funding or pricing decisions.
The output
cohort | CAC | monthly revenue | gross margin | monthly gross profit | simple payback | assumptions
Worked fictional example
Fictional CAC 120, monthly revenue 50, margin 60% gives monthly gross profit 30 and simple payback 4 months, not 2.4. Missing margin blocks the result; churn may prevent real payback.
Checks and limits
Preserve source versions and original values. Unknowns stay unknown. Use a qualified reviewer for regulated, legal or hiring decisions. No send, share, account change, schedule, ledger update or payment is authorized. No live account test is claimed.
More founders workflows · How-to guides
Method: reviewed source. Demand lead: GSCinvestors19;distinctfromrunwayandCACscope. These are site-query cluster impressions and method evidence, not exact new-topic monthly search volume or a traffic promise. Checked October 3, 2026.