# CAC Payback Calculator

> CAC Payback: Payback months = CAC ÷ (monthly revenue per customer × gross margin). Methodology stated, your own inputs only.

Page: https://freecalculator.tech/tools/cac-payback-calculator
Last reviewed: 2026-10-15

## Formula

Payback months = CAC ÷ (monthly revenue per customer × gross margin).

- Methodology: margin-adjusted, undiscounted payback; ignores churn during the payback period.
- Some teams use revenue instead of gross profit — that gives a shorter, less conservative figure.
- Inputs are your own.
- Payback months = CAC ÷ (monthly revenue per customer × gross margin).
- Inputs used: Currency (symbol only, never converted), Customer acquisition cost, Revenue per customer per month, Gross margin (your figure).

## Inputs

- Currency (symbol only, never converted)
- Customer acquisition cost
- Revenue per customer per month
- Gross margin (your figure)

## Worked example: A subscription

$1,500 CAC, $80 per month, 75% margin.
1. Gross profit = $60 per month.
2. 1,500 ÷ 60 = 25 months.

## Common questions

### Does churn matter?

Yes — a customer who leaves before payback never repays CAC. Compare payback to expected lifetime.

### Revenue-based payback?

Set gross margin to 100% to see it. Check the formula, example, and limitations on this page before using the result for a real customer economics decision.

### What is a good value?

We don't assume an industry-standard figure. Compare against your own history and plan, not a rule of thumb.

### How do I use the CAC Payback Calculator?

Enter the required values for Currency (symbol only, never converted), Customer acquisition cost, Revenue per customer per month, Gross margin (your figure). The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the CAC Payback Calculator use?

Payback months = CAC ÷ (monthly revenue per customer × gross margin). The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone.

### Can the CAC Payback Calculator be used for exact decisions?

Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.

## Limitations and assumptions

- Undiscounted.
- No churn during payback.
- Results are educational estimates built only from the figures you enter. They are not personalised investment, tax, legal or accounting advice. Rates, growth and discount assumptions are always yours to choose.
- The result depends on the values you enter for this cac payback calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- OpenStax — https://openstax.org/books/principles-marketing/pages/1-unit-introduction

## Cite this page

- APA: Free Calculator. (2026, October 15). CAC Payback Calculator. https://freecalculator.tech/tools/cac-payback-calculator
- MLA: "CAC Payback Calculator." Free Calculator, 15 Oct. 2026, https://freecalculator.tech/tools/cac-payback-calculator.
- Link: CAC Payback Calculator — Free Calculator, https://freecalculator.tech/tools/cac-payback-calculator