Customer Acquisition Cost Calculator: CAC, Budget & Customers

Customer Acquisition Cost Calculator

Calculate actual CAC from acquisition costs and new customers, or plan the customers and budget supported by a target CAC.

The calculator formats amounts; it does not convert exchange rates.
Use costs and customers from the same period and scope.
Count paying customers, not leads or clicks.

Customer acquisition cost (CAC) measures how much a business spends to acquire one new paying customer. This page consolidates “CAC calculator,” “customer acquisition calculator” and “customer acquisition cost formula” into one practical tool.

Customer acquisition cost formula

CAC = total acquisition costs ÷ new customers acquired

Keep the numerator and denominator aligned. If costs cover January through March, count only customers acquired in January through March. For a blended CAC, include all relevant sales and marketing acquisition costs and all new customers. For a channel CAC, use only costs and customers attributable to that channel.

What should be included in acquisition costs?

Depending on the decision you are making, costs may include advertising, sales payroll attributable to acquisition, commissions, agency fees, creative production, marketing software, events and other direct acquisition expenses. Document your scope so comparisons remain consistent.

Important: CAC is not the same as CPC or CPA. CPC prices a click. CPA prices whatever action a campaign defines. CAC should use new paying customers as the outcome.

Verified examples

Example 1: actual CAC from a total

A business spends $120,000 and acquires 600 new customers. CAC = $120,000 ÷ 600 = $200 per customer. At that rate, 100 customers cost $20,000 and $1,000 supports 5 customers.

Example 2: itemized acquisition costs

Marketing of $60,000, attributable sales payroll of $30,000, tools and agencies of $6,000, and other costs of $4,000 total $100,000. With 500 new customers, CAC = $100,000 ÷ 500 = $200.

Example 3: customers supported by a budget

With a $50,000 budget and target CAC of $180, the theoretical result is 277.78 customers. At most 277 whole customers fit within budget, leaving $140.

Example 4: required budget

A goal of 400 customers at a target CAC of €150 requires 400 × €150 = €60,000.

How to interpret CAC

A lower CAC is not automatically better if it brings lower-value customers. Compare CAC with the value and gross profit generated by the same customer cohort. The customer lifetime value calculator can help evaluate LTV:CAC and payback. For campaign economics, also review the ROAS calculator and CPC calculator.

Limits and assumptions

  • This calculator does not attribute customers across channels or remove organic demand automatically.
  • Currency selection changes formatting only; it does not perform foreign-exchange conversion.
  • Whole-customer planning rounds down to avoid exceeding the budget.
  • Inputs are limited to positive finite values, costs up to 1 trillion, and customer counts up to 1 billion.
  • Results are planning estimates, not a forecast of future sales or profitability.