Customer Acquisition Cost Payback Period
CAC Payback Period is the number of months it takes to recover the cost of acquiring a customer through their subscription payments. It measures capital efficiency and how quickly you turn CAC into profit.
CAC: $6,000. ARPU: $500/month. Gross Margin: 80%. Payback = $6,000 / ($500 × 0.80) = 15 months.
Payback period determines how much capital you need to fund growth. Short payback (< 12 months) means you can reinvest in growth quickly. Long payback (> 18 months) means growth requires lots of cash.
Excellent
Good
Acceptable
Too long
Use both. LTV:CAC tells you total return on acquisition spend. Payback tells you how quickly you get cash back. A 5:1 LTV:CAC with 24-month payback requires more capital than 3:1 with 8-month payback.
Reduce CAC (better targeting, conversion optimization), increase ARPU (pricing, upsell earlier), improve gross margin (reduce COGS), or collect more cash upfront (annual contracts).
Both. Blended shows overall efficiency. Segmented reveals which customer types are capital-efficient vs. capital-intensive. You might find SMB pays back in 8 months while enterprise takes 20.
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Lifetime Value to Customer Acquisition Cost Ratio
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