What Is CAC (Customer Acquisition Cost)? Formula & Benchmarks (2026)
CAC (customer acquisition cost) is what you spend, on average, to win one new customer. The formula is: CAC = total acquisition spend (ads + marketing + related labor) ÷ new customers in the same period. CAC alone says nothing about health — what matters is comparing it against the customer's lifetime value (LTV). Growth is healthy and sustainable only when LTV comfortably exceeds CAC.
To put CAC and LTV side by side, use our CAC/LTV calculator; to work out per-product costs, use the profit calculator.
The formula
CAC = total acquisition spend ÷ new customers acquired in the same period
Acquisition spend should include ad spend, marketing tools, and labor spent on acquisition — not just media cost. Counting media alone understates your true CAC.
To judge profitability, compare CAC against LTV, or against first-order contribution margin: if the first order's margin can't cover CAC, you only recoup it through repeat purchases.
Worked example
In a month you spend $5,000 on acquisition and add 250 customers. CAC = 5,000 ÷ 250 = $20. If each customer's LTV is $60, then LTV:CAC = 60:20 = 3:1 — a healthy range. If LTV is only $25, the ratio is just 1.25:1, meaning almost no profit headroom: either lower CAC or raise LTV.
CAC-to-LTV ratio guidance
| LTV:CAC | Read |
|---|---|
| Below 1:1 | Losing money — every customer costs more than they're worth |
| 1:1 - 3:1 | Tight, slow payback, needs optimizing |
| Around 3:1 | Widely treated as a healthy target |
| Above 5:1 | Great, but you may be under-spending — scale acquisition |
3:1 is a common rule of thumb, not a law: high-repeat, long-lifecycle categories can accept a lower immediate ratio, while one-off impulse buys demand a higher one.
Frequently asked questions
What is a good CAC? There's no absolute number. What matters is its ratio to LTV; the common healthy target is LTV:CAC ≈ 3:1. The same $20 CAC is great for a high-LTV product and a loss for a one-off cheap item.
What's the difference between CAC and ROAS? ROAS measures revenue return on a single ad; CAC measures the cost to win a customer. ROAS leans toward per-campaign efficiency, CAC toward unit economics — paired with LTV it shows whether acquisition pays off long term.
Which costs belong in CAC? More than media spend. Include ads, marketing software/tools, agency or creator fees, and labor spent on acquisition. Leaving these out makes CAC look artificially low and distorts decisions.
How do I lower CAC? Improve conversion rate, sharpen audiences and creative, grow organic traffic and repeat share, and raise average order value (AOV) so each acquisition is worth more.
Acquisition is only the start; what really sets how much you can spend to acquire is the customer's lifetime value (LTV) — read the two together.
Leads EshopPick's product-research and data desk. Focuses on TikTok Shop US sourcing frameworks, fee-and-profit math, and platform comparisons. Every take is grounded in our weekly real-sales data and Opportunity Score — practical calls, not chart-chasing.