Customer Acquisition Cost (CAC

Customer Acquisition Cost (CAC) measures the total cost of acquiring a new paying customer, including ad spend, sales salaries, marketing tools, and agency fees.

To use the Customer Acquisition Cost (CAC) & Payback Period Calculator, enter your Total Sales & Marketing Expenses, New Customers Acquired, Average Monthly Revenue per Customer (ARPU) and other values. The calculator instantly computes Customer Acquisition Cost (CAC), CAC Payback Period and more. Results update in real time as you change any input — no submit button needed.

How to Use This Calculator

Enter your Total Sales & Marketing Expenses (Ad spend + Salaries) (e.g. 25000 in ), New Customers Acquired (e.g. 100 in customers), Average Monthly Revenue per Customer (ARPU) (e.g. 50 in /mo), and Gross Profit Margin (e.g. 80 in %). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Customer Acquisition Cost (CAC) = Total Sales & Marketing Costs ÷ New Customers Acquired

Monthly Gross Profit per Customer = ARPU × Gross Margin %

CAC Payback Period (Months) = CAC ÷ Monthly Gross Profit per Customer

Worked Example

25,000 Sales & Marketing costs acquiring 100 new customers:

CAC = 25,000 / 100 = 250.00 per customer.

Monthly Gross Profit = 50 × 0.80 = 40.00/month.

CAC Payback Period = 250 / 40 = 6.25 months (HEALTHY PAYBACK).

Understanding Your Result

Marketing metrics are most useful as trends over time rather than isolated snapshots. Benchmark your result against your own historical performance first, then against industry averages. Attribution models (last-click vs. multi-touch) can produce dramatically different channel ROI figures — ensure consistent attribution methodology before making channel budget decisions. Statistical significance requires sufficient sample size: most A/B test decisions need a minimum of 1,000 conversions per variant for reliable results.