CAC Calculator
Customer acquisition cost is everything you spend to win customers, divided by the customers you won. Add revenue and churn to see whether that cost pays back.
Acquisition spend (same period)
For LTV:CAC and payback (optional)
CAC
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LTV : CAC
How it's calculated
CAC = (Marketing + Sales + Tools) ÷ New customers
LTV = Revenue per month × Gross margin ÷ Monthly churn
Payback (months) = CAC ÷ (Revenue per month × Gross margin)
- A 3:1 LTV:CAC ratio is the common SaaS rule of thumb. Below 1:1 you lose money on every customer. Far above 5:1 may mean you're under-investing in growth.
- Payback under 12 months is widely treated as healthy for SMB-focused SaaS.
- "Blended" CAC (all customers, including organic) looks better than "paid" CAC. Track both.