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CAC Payback Period Calculator

How many months a customer takes to repay what they cost.

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Payback period

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Monthly gross profit per customer—
Average customer lifespan—

Quick Tool Overview

The CAC Payback Period Calculator divides acquisition cost by the monthly gross profit a customer generates to give payback in months, then checks it against how long customers actually stay.

What it does
Calculates how many months a customer takes to repay their CAC
You give it
CAC, monthly revenue per customer, gross margin and optional churn
You get back
Payback in months, monthly gross profit, and a churn check
Best for
Checking whether growth is affordable, not just profitable
Marketing Tools Free, unlimited use No sign-up Runs in your browser

About the CAC Payback Period Calculator

CAC payback is the cash-flow question behind every growth plan: how long does a customer take to give back what they cost to win? A business with a healthy lifetime-value ratio can still run out of money if that answer is eighteen months and the cash is going out today.

Enter your customer acquisition cost, the monthly revenue a customer generates and your gross margin, and the calculator returns payback in months, along with the monthly gross profit per customer that drives it.\n\nAdd a monthly churn rate and it goes a step further, comparing payback against the average customer lifespan — because a payback period longer than your customers typically stay is a business that loses money on every sale, however good the acquisition numbers look.

Key features of the CAC Payback Period Calculator

Gross profit based

Uses margin rather than revenue, which is where most versions go wrong.

Churn check

Flags a payback period longer than the average customer lifespan.

First-year value

Shows the gross profit left after payback over twelve months.

Formula shown

Every step is written out with your own numbers in it.

How to use the CAC Payback Period Calculator

  1. 1

    Enter your CAC

    Total sales and marketing spend divided by new customers acquired.

  2. 2

    Enter monthly revenue per customer

    The recurring or average monthly spend of one customer.

  3. 3

    Enter gross margin

    Payback runs on gross profit, not revenue — this is the step most people skip.

  4. 4

    Add monthly churn

    Optional — it checks payback against how long customers actually stay.

Frequently asked questions

Payback months = CAC ÷ (Monthly revenue per customer × Gross margin). A CAC of 600 against 80 monthly revenue at a 75% margin gives 600 ÷ 60 = 10 months.

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