Customer Acquisition Cost Calculator
What Each New Customer Actually Costs
Every marketing channel has a hidden price tag per customer, and it's rarely obvious until it's calculated directly. Customer Acquisition Cost (CAC) collapses total marketing spend and total new customers into a single, comparable number — the average cost to win one new buyer — which is what makes it possible to judge whether a channel is actually worth the budget going into it.
The Formula
The spend figure should cover everything attributable to acquisition for the period being measured — ad spend, campaign tools, and any related costs — divided by the count of genuinely new customers that spend produced.
Why CAC Is a Core Business Metric
- Channel comparison — computing CAC separately for paid search, social ads, and affiliate marketing shows which channel is actually the most efficient, rather than which one has the biggest budget.
- Unit economics and CAC:LTV ratio — CAC only means something next to customer lifetime value; a business spending more to acquire a customer than that customer will ever be worth is structurally unprofitable no matter how much revenue it generates.
- Budget planning — once CAC is known, "how many new customers will a $10,000 campaign produce" becomes a straightforward division rather than a guess.
CAC by Spend and Customer Count
| Marketing spend | New customers | CAC |
|---|---|---|
| $5,000 | 100 | $50.00 |
| $12,000 | 150 | $80.00 |
| $2,000 | 40 | $50.00 |
| $25,000 | 500 | $50.00 |
Figures computed directly from the calculator's own formula. Note that $5,000/100 customers and $25,000/500 customers both land at $50 CAC despite very different budgets — CAC is about efficiency, not total spend.
How to Use This Calculator
- Enter your Total Marketing Spend for the period.
- Enter the number of New Customers Acquired in that same period.
- Select Calculate to get your customer acquisition cost.
Related Calculations
Compare that cost against what a typical order is worth using the Average Order Value Calculator, or see where checkout friction might be inflating your effective acquisition cost with the Shopping Cart Abandonment Calculator.