---
title: "CAC payback period calculator: free, no signup"
description: "How many months until a customer pays back what they cost, from CAC, price and margin."
source: https://savepad.app/free-tools/payback-period-calculator
---
# CAC payback period calculator

How many months until a customer pays back what they cost, from CAC, price and margin.

## How it works

Enter your CAC, what a customer pays you each month and your gross margin. The CAC payback period calculator tells you how many months it takes for a customer to pay back what they cost to win.

It uses gross margin, not revenue, because only the part you keep pays back your acquisition cost.

## FAQs

### How do you calculate CAC payback period?

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

### What is a good CAC payback period?

Under 12 months is great. Between 12 and 24 is common for B2B SaaS. Over 24 months makes growth expensive.

### Why use gross margin?

Because you only keep your margin. A €100 customer at 80% margin gives you €80 a month to pay back what you spent winning them.

## More tools like this

- [Customer acquisition cost calculator: Ad spend, salaries, tools and agency fees in, the real CAC per channel out.](https://savepad.app/free-tools/cac-calculator)
- [Break-even ROAS calculator: Your margin in, the ROAS you need to stop losing money out. Any number solves for the rest.](https://savepad.app/free-tools/break-even-roas-calculator)
- [Ad frequency calculator: Reach and impressions in, frequency out, with the point where people start scrolling past.](https://savepad.app/free-tools/ad-frequency-calculator)

## Want the whole swipe file?

Savepad launches soon. Leave your email and I'll let you know when it's live.