Customer Acquisition Cost Calculator guide
Customer acquisition cost divides attributable sales and marketing costs by newly acquired customers. A fully loaded measure can include staff, agencies, software, commissions, and channel spending.
The preserved calculator provides channel CAC, monthly trends, efficiency scoring, benchmarks, history, sharing, and exports.
How to use the customer acquisition cost calculator
- Enter current amounts: Use current, documented values from the same relevant period.
- Enter assumptions: Use realistic rates, percentages, periods, and costs where applicable.
- Review the full result: Review the primary estimate together with its supporting measures.
- Stress-test risk: Model less favorable timing, value, cost, or rate assumptions.
Formula and variables
The estimate applies the entered values and assumptions to the stated formula.
CAC = total sales and marketing acquisition costs / new customers acquired- Inputs — Entered values
- The amounts, percentages, or periods supplied to the calculator.
- Result — Calculated output
- The estimate produced by applying the formula to the entered values.
Worked example: customer acquisition cost calculator
A user enters a representative set of values and assumptions.
- Key inputs
- Amounts, percentages, periods, and costs
- Apply the stated formula.
- Include all relevant entered values and constraints.
- Compare the result with an alternative scenario.
Result: Total acquisition cost, blended and channel CAC, LTV-to-CAC ratio, trends, benchmarks, and recommendations.
Use the estimate as a planning input and verify important decisions with current records or qualified guidance.
Understanding your results
Primary estimate
Total acquisition cost, blended and channel CAC, LTV-to-CAC ratio, trends, benchmarks, and recommendations.
Risk measures
Use supporting payment, leverage, cost, and cash figures together.
Assumptions
- Entered rates and costs remain constant.
- Payments and cash flows occur on schedule.
Limitations
- Taxes, legal terms, accounting treatment, and transaction-specific costs may differ.
- Future values, timing, and rates are uncertain.
Common mistakes
- Reviewing only the headline result.
- Ignoring relevant costs, timing, or supporting measures.
- Using optimistic timing or value assumptions.
- Treating an estimate as a guaranteed outcome.
Practical use cases
Compare scenarios consistently
Change one assumption at a time or enter each alternative using the same basis.
Plan cash requirements
Estimate funds needed before committing.
Planning and decision guide
Stress-test the assumptions
Use the same attribution period for costs and acquired customers.
Review the important risks
Include labor, tools, agency, and indirect acquisition costs consistently.
Verify the source values
Evaluate CAC with margin-adjusted lifetime value and payback timing.
Frequently asked questions
What is CAC?
The average sales and marketing cost required to acquire one new customer.
What is LTV to CAC?
Customer lifetime value divided by acquisition cost.
Should salaries be included?
A fully loaded CAC normally includes attributable sales and marketing labor.
Sources and review
- Market research and competitive analysis — U.S. Small Business Administration. Accessed 2026-07-10.
Reviewed 2026-07-10.