CAC Payback Period Calculator

The CAC Payback Period is the number of months it takes for a business to recover its Customer Acquisition Cost (CAC) through the gross profit generated by that customer’s repeat purchases. This is a vital cash-flow metric for DTC e-commerce brands and B2B SaaS companies, dictating how fast a business can reinvest capital into marketing to scale growth.

How do you use this Payback Period calculator?

1. Input CAC: Enter the cost to acquire a net-new customer.
2. Input AOV: Enter your Average Order Value.
3. Input Gross Margin: Enter your margin percentage to isolate profit from revenue.
4. Input Purchase Frequency: Enter how many times an average customer buys per year.
5. Calculate Velocity: The tool will output the exact Months to Payback and the profit generated per order.

What is a CAC Payback Period and why does it matter?

While Customer Lifetime Value (CLV) looks at long-term profitability, Payback Period looks at immediate cash liquidity. Understanding this requires:

• Customer Acquisition Cost (CAC): The total sales and marketing cost to acquire one new customer.
• Gross Profit Margin: The revenue remaining after deducting the Cost of Goods Sold (COGS).
• Purchase Frequency: How often the customer buys within a 12-month window.
• Cohort Velocity: A 3 to 6 month payback period is excellent for DTC, while SaaS companies generally aim for < 12 months.

How do you calculate CAC Payback Period?

You calculate the payback period by dividing the total CAC by the average gross profit the customer generates on a monthly basis.

• Gross Profit Per Order = AOV * Gross Margin %
• Monthly Purchases = Annual Purchase Frequency / 12
• Monthly Customer Profit = Gross Profit Per Order * Monthly Purchases
• Payback Period (Months) = CAC / Monthly Customer Profit

Why use Payback Period instead of just LTV:CAC?