Customer Acquisition Cost Calculator
Customer Acquisition Cost (CAC) Calculator
| CAC Breakdown | Amount |
|---|---|
| Marketing Spend | $10,000 |
| Sales Spend | $5,000 |
| Total Acquisition Spend | $15,000 |
| New Customers Acquired | 150 |
| Marketing CAC | $67 |
| Sales CAC | $33 |
| Blended CAC | $100 |
| Attributed Spend (80%) | $12,000 |
| Attributed CAC | $80 |
| Payback Period | 2.5 months |
Summary
What Is a Customer Acquisition Cost (CAC) Calculator?
A customer acquisition cost calculator measures how much a business pays, on average, to win a single new customer. CAC is the total of everything spent to attract and convert buyers — advertising, content, sales team salaries, and the software that supports them — divided by the number of customers those efforts produced. It is the single most important efficiency number for a growth organization, because it answers the question every founder and marketer eventually asks: are we paying too much to grow? In the default scenario, a company spending $15,000 across marketing and sales to win 150 customers is paying $100 per customer. Whether that is healthy depends entirely on how much each customer is worth, which is why this calculator pairs CAC with average revenue per customer and a payback period. Growth is only sustainable when the cost of acquiring a customer is recovered by their profit before the cash runs out, and this tool makes that relationship visible in seconds.
How It Works
The blended CAC is the sum of marketing spend and sales spend divided by the number of new customers acquired over the period. Marketing CAC isolates the advertising, content, and campaign portion, while sales CAC isolates the salaries, commissions, and tools of the sales organization, so you can see which side of the funnel is driving cost. With the defaults, $10,000 of marketing spend produces a marketing CAC of $66.67, $5,000 of sales spend produces a sales CAC of $33.33, and the blended figure lands at $100. The attribution rate handles the reality that some marketing spend assists existing customers rather than acquiring new ones: at an 80% attribution rate, only $12,000 of the $15,000 counts toward acquisition, lifting the attributed CAC to $80 and giving a more honest view of new-customer economics. The payback period converts the CAC into months using the annual revenue per customer, gross margin, and the length of the measurement period — at the defaults, a $100 CAC against $40 of monthly profit means the customer pays for themselves in two and a half months. Shorter payback periods mean faster reinvestment and less working capital tied up in growth.
Understanding Your Results
The blended CAC is the headline number, but the marketing CAC and sales CAC splits are where the insight lives. If marketing CAC is climbing while conversion rates hold steady, ad costs or creative fatigue are the culprits; if sales CAC is high, look at sales cycle length, demo-to-close rates, and quota attainment. The payback period is the number to compare against your cash runway and gross margin — a rule of thumb is that payback inside 12 months is strong, and inside 6 months is excellent for most businesses. Benchmarks vary by industry: subscription businesses often tolerate higher CAC because lifetime value is recurring, while low-margin retail needs very short payback. Track CAC quarterly against the same spend inputs, and pair it with the LTV to CAC ratio, where 3:1 is the widely cited healthy benchmark. If your payback is longer than the customer's likely lifespan, no amount of growth will fix the economics — reduce spend, tighten attribution, or raise prices before scaling.
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