The CAC Payback Period Calculator computes how many months of gross profit it takes to recoup the sales and marketing dollars spent acquiring a single customer. It is the benchmark metric used by venture capital investors to evaluate capital efficiency and scalable unit economics.
Mathematical Formula
CAC Payback Period = CAC / (Monthly ARPU * (Gross Margin / 100))
- CAC: Blended Customer Acquisition Cost.
- Monthly ARPU: Average Revenue Per User/Account per month.
- Gross Margin %: Percentage of revenue left after direct costs of serving the customer.
SaaS Industry Benchmarks
- Under 12 Months: Top-quartile capital efficiency. Green light to pour capital into sales acquisition channels.
- 12 to 18 Months: Standard acceptable range for venture-backed mid-market software companies.
- Over 18 Months: Cash-intensive. Demands large reserves and increases risk if customer churn happens early.
Frequently Asked Questions (FAQ)
Why is Gross Margin factored into CAC Payback?
Revenue alone is misleading because software delivery has real hosting and support costs. Only the gross margin dollars repay the upfront acquisition expense.
How does annual upfront billing change CAC Payback?
When customers pay 12 months upfront, the cash payback drops to day zero, completely eliminating negative cash conversion cycles.