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Customer Acquisition Cost with LTV:CAC ratio. Blended spend, per-customer math, healthy-target guidance.
Ads, content, tools, attributable payroll
Sales team comp + tools; use 0 if self-serve
Enter to see LTV:CAC ratio
Customer Acquisition Cost
$300.00
$12,000.00 combined spend ÷ 40 customers
LTV:CAC ratio
6.00×
Excellent — consider spending more
$1,800.00 LTV ÷ $300.00 CAC. Healthy SaaS targets 3–5×.
CAC is the bottom-line cost of growth. If it's higher than the gross profit you earn from a customer, you're losing money on every new customer — no amount of scale will fix that. If it's comfortably below a third of LTV, you can afford to push spend and grow faster.
| Model | Healthy LTV:CAC | Typical payback |
|---|---|---|
| SaaS (SMB) | 3–4× | 12–18 months |
| SaaS (Enterprise) | 3–5× | 18–24 months |
| Ecommerce (repeat) | 4–6× | 2–4 orders |
| Ecommerce (single-purchase) | 1.5–2.5× | First order |
| Marketplace | 3–5× | 6–12 months |
| Consumer subscription | 3–5× | 6–9 months |
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CAC (Customer Acquisition Cost) measures the full cost to acquire a paying customer — ad spend, sales payroll, tools, and content. CPA (Cost Per Acquisition) usually measures just ad spend per conversion, where the 'conversion' might be a lead or signup rather than a paying customer. CAC is always higher than CPA when they're measured on the same customer.
Strictly: all marketing spend (paid ads, content production, marketing tools, the portion of marketing payroll attributable to acquisition) plus sales spend (sales rep comp, sales tools, commissions paid on new customers). Exclude customer success and retention costs — those belong to LTV calculations, not CAC.
The classic SaaS benchmark is 3:1 — you earn $3 in lifetime value for every $1 spent acquiring. Below 1:1 means losing money on each customer. Below 3:1 typically means margin is too thin for scale. Above 5:1 often means you're under-investing in growth and could spend more aggressively.
CAC payback is how many months it takes for a customer's gross profit to cover the cost of acquiring them. For SaaS, healthy payback is under 12 months; 18–24 months is tolerable if gross margin is high. Ecommerce typically targets payback on the first or second order. Long payback periods require substantial working capital and slow growth.
Because small customer counts create noise. A startup acquiring 20 customers a month will see CAC swing 30–50% on a single campaign win or a bad creative cycle. Smooth CAC with a trailing 3-month average; month-to-month noise below that horizon shouldn't drive optimization decisions.
Both. Blended CAC shows overall unit economics and is the number investors and leadership track. Paid-only CAC (ad spend ÷ attributable customers) shows channel efficiency for marketing decisions. The gap between the two tells you how much of your growth is organic — a healthy gap means brand and word of mouth are subsidizing paid.
