Customer Acquisition Cost Calculator – CAC Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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Customer Acquisition Cost Calculator – CAC Calculator turns a familiar business question into a compact set of numbers, so you can see the relationship without building a separate spreadsheet.

What this calculator does

Customer Acquisition Cost Calculator – CAC Calculator calculates customer acquisition cost by dividing combined marketing and sales acquisition spending by the number of new customers acquired. That makes the output useful for the specific relationship being measured here, while keeping any unentered business or investment assumptions outside the calculation.

How to use it

Enter Currency, Cost of marketing, Cost of sales, and Number of new customers. Use figures from the same reporting period and the same accounting, workforce, inventory, or campaign definition wherever possible. The currency selector changes display currency only; it does not perform an exchange-rate conversion. Before using the result in a decision, recheck unusually large or negative values against the source data rather than assuming the calculator is correcting an inconsistent input.

How the calculation works

Customer acquisition cost = (marketing cost + sales cost) ÷ new customers acquired. The numerator should include only costs you intend to attribute to the acquisition period represented by the customer count.

Example

$5,000 of marketing plus $3,000 of sales cost creates $8,000 total acquisition cost. Across 100 new customers, CAC is $80.

How to interpret the result

Read the output as a campaign-efficiency or monetization measure for the entered reporting window. Attribution rules, viewability, invalid traffic, platform fees, refunds, organic conversions, audience quality, and downstream customer value are outside the number unless you include them in the inputs.

Limitations and notes

The calculation is only as consistent as its inputs. Accounting policy, attribution rules, period length, one-time items, seasonality, and local reporting conventions can change what should be included in a numerator or denominator. Use the same definitions when comparing periods, and do not treat a simplified ratio as a complete operational diagnosis.