CAC Payback Period Calculator
Calculate how many months it takes to recover your customer acquisition cost. Benchmark against SaaS standards.
CAC payback period calculator
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Understanding CAC Payback Period
What it does
Calculates how many months it takes for a customer's net contribution to cover their acquisition cost. Factors in MRR and gross margin.
Why it matters
Payback period is critical for cash flow planning and investor confidence. A 12-month payback means you need 12 months of runway for each cohort. A 6-month payback lets you reinvest faster.
Definition
Payback = CAC / (MRR × Gross Margin %). Tells you months needed to recover acquisition cost from gross profit.
Assumptions
- •MRR is stable and doesn't include future increases from expansion.
- •Gross margin is the percentage of MRR available after COGS and hosting costs.
- •Customer lifetime is longer than payback period.
How to interpret your results
Under 12 months is excellent for SaaS. 12-18 is good. Over 24 months means your acquisition costs are too high or your pricing/margins too low. Improving either metric helps significantly.
How to improve
Reduce CAC
Use more efficient channels (content, referrals), improve lead quality, and automate early-stage qualification.
Increase MRR
Raise prices, expand product scope, or target larger customers with higher budgets.
Improve gross margin
Optimize hosting costs, reduce COGS, or shift to higher-margin products.