Customer Acquisition Cost (CAC) Calculator
Find out what it really costs to win a customer, whether your CLV:CAC ratio is healthy, and how quickly you recover acquisition spend — the core of profitable Shopify growth.
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For DTC and ecommerce brands looking for a fast, code-free way to increase AOV and boost cart conversions through intelligent upselling.
How CAC is calculated
CAC = Total Sales & Marketing Spend ÷ New Customers Acquired
CLV:CAC ratio = Customer Lifetime Value ÷ CAC
CAC on its own means little — it only matters relative to how much a customer is worth. That is why the CLV:CAC ratio is the number investors and operators watch: it tells you whether each acquisition dollar creates value, and by how much.
The fastest lever on unit economics for most stores isn't cutting ad costs — it's raising CLV. Higher AOV at checkout and stronger repeat rates lift lifetime value directly, improving the ratio and shortening payback.
Frequently asked questions about CAC
What is customer acquisition cost (CAC)?
CAC is the total cost to acquire one new customer — all sales and marketing spend divided by the number of new customers gained in the same period. If you spent $5,000 on ads and creative in a month and gained 100 new customers, your CAC is $50. It is one of the most important numbers in ecommerce because it determines whether growth is profitable.
What is a good CLV:CAC ratio?
A CLV:CAC ratio of 3:1 or higher is generally considered healthy — you earn at least $3 in lifetime value for every $1 spent acquiring a customer. A ratio near 1:1 means you break even and cannot fund growth; above 5:1 may mean you are under-investing in marketing and leaving growth on the table.
How do I calculate CAC?
CAC = Total Sales & Marketing Spend ÷ Number of New Customers Acquired. Include ad spend, agency and creative costs, marketing software, and sales staff time attributable to acquisition. Divide by only new customers (not repeat orders) over the same time window for an accurate figure.
What is CAC payback period?
CAC payback period is how long it takes for a customer to generate enough gross profit to cover what you spent acquiring them. Payback = CAC ÷ (Average Monthly Gross Profit per Customer). Shorter is better — under 3–6 months is strong for ecommerce because it frees cash to acquire the next customer faster.
How can I lower my effective CAC?
You cannot always cut ad costs, but you can raise the value each acquired customer delivers. Increasing average order value with upsells and bundles, and improving repeat purchase rate, both raise CLV — which improves your CLV:CAC ratio and shortens payback even if the raw CAC number stays the same.
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