Customer Acquisition Cost Calculator: method, checked example and practical limits
Divide acquisition costs by the number of new customers acquired. CAC is a cost per acquired customer under the selected expense scope, rather than a cost per lead or click.
Inputs used by this calculator
Customer Acquisition Cost Calculator uses the fields below. The starting values reproduce the page example; replace them with values from the same units and time period before using the result.
| Input | Starting example | Accepted value | How it is used |
|---|---|---|---|
| Marketing costs | 18,000 | 0 to 1000000000000000 | Supplies the marketing costs quantity used by the published equation or result breakdown. |
| Sales costs | 12,000 | 0 to 1000000000000000 | Supplies the sales costs quantity used by the published equation or result breakdown. |
| New customers | 300 | 0 to 1000000000000 | Selects the unit or conversion path used by Customer Acquisition Cost Calculator. |
Inputs and measurement conventions
The quantities used on this page are Marketing costs, Sales costs, New customers. Start with values for the same situation and read the units attached to each field. The field reference below shows supported choices and numerical limits.
Blended and paid-channel CAC are not interchangeable. Include the sales and marketing costs required by your chosen definition.
Method and equation
Divide the included acquisition expenditure by new customers in the same measurement window.
Customer Acquisition Cost Calculator uses the following stated relationship: CAC = (marketing costs + sales costs) ÷ new customers. Its assumptions determine which question the answer can resolve.
CAC = (marketing costs + sales costs) ÷ new customersWorked calculation with the starting values
Marketing costs: 18000; Sales costs: 12000; New customers: 300. These starting values give 100 cost per acquired customer. The calculation breakdown is Total acquisition cost: 30,000; Customers: 300; Marketing share: 60.
$30,000 of acquisition cost for 300 customers produces $100 CAC.
Reading the answer
CAC is a cost per acquired customer under the selected expense scope, rather than a cost per lead or click.
Total acquisition cost: 30,000; Customers: 300; Marketing share: 60. These intermediate quantities make the stated Customer Acquisition Cost Calculator model inspectable; they should be read together with the main answer rather than treated as independent guarantees.
Common errors and model boundaries
Blended and paid-channel CAC are not interchangeable. Include the sales and marketing costs required by your chosen definition.
Use one cohort and the same period for costs and customers; overhead allocation varies by business.
Independent verification and next decision
Not when measuring acquisition of new customers; mixing repeat purchases changes the question and understates new-customer CAC.
For the Customer Acquisition Cost Calculator method, compare CAC = (marketing costs + sales costs) ÷ new customers with the starting inputs and the calculation table. The linked U.S. Small Business Administration: business guide and Federal Trade Commission: advertising and marketing basics references identify the relevant definitions, conventions or domain limitations. Retain intermediate precision when comparing a manually worked answer.
Customer Acquisition Cost Calculator worked-example ledger
| Quantity | Example value | Role |
|---|---|---|
| Marketing costs | 18000 | Entered assumption |
| Sales costs | 12000 | Entered assumption |
| New customers | 300 | Entered assumption |
| Main answer | 100 cost per acquired customer | Calculated from the starting inputs |
| Total acquisition cost | 30,000 | Intermediate or contextual output |
| Customers | 300 | Intermediate or contextual output |
| Marketing share | 60 | Intermediate or contextual output |
Frequently asked questions
Should returning customers be in the denominator?
Not when measuring acquisition of new customers; mixing repeat purchases changes the question and understates new-customer CAC.
Which relationship does the Customer Acquisition Cost Calculator use?
Divide the included acquisition expenditure by new customers in the same measurement window. The displayed relationship is CAC = (marketing costs + sales costs) ÷ new customers.
What do the starting values produce in the Customer Acquisition Cost Calculator?
Marketing costs: 18000; Sales costs: 12000; New customers: 300. These starting values give 100 cost per acquired customer. The calculation breakdown is Total acquisition cost: 30,000; Customers: 300; Marketing share: 60.
How should I interpret this Customer Acquisition Cost Calculator answer?
CAC is a cost per acquired customer under the selected expense scope, rather than a cost per lead or click.
Which input mistake most affects the Customer Acquisition Cost Calculator?
Blended and paid-channel CAC are not interchangeable. Include the sales and marketing costs required by your chosen definition.
What is outside this Customer Acquisition Cost Calculator model?
Use one cohort and the same period for costs and customers; overhead allocation varies by business.
What to keep in mind
Use one cohort and the same period for costs and customers; overhead allocation varies by business.
Results are rounded for display in US format, with money in dollars and cents; CSV exports keep full calculation precision. This is a calculation summary, not an official certificate.