Business

CAC Payback Period Calculator

Months to earn back what a customer costs to acquire.

Enter your values

Sales and marketing spend($)

Enter the sales and marketing spend in $.

New customers acquired

Enter the new customers acquired you are working with.

Monthly revenue per customer($)

Enter the monthly revenue per customer in $.

Gross margin(%)

Enter the gross margin in %.

Monthly churn(%)

Enter the monthly churn in %.

Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.

Results

CAC payback period: 8 months
Customer acquisition cost: $1,500.00
Gross margin per customer per month: $187.20
Expected customer lifetime: 40 months
LTV: $7,488.00
LTV:CAC ratio: 4.99:1
Benchmark: Healthy — under 12 months

Quick answer

CAC payback = customer acquisition cost ÷ (monthly revenue per customer × gross margin). Under 12 months is the usual SaaS benchmark.

Payback months = CAC ÷ (ARPU × gross margin)

At a glance

What it does	Months to earn back what a customer costs to acquire.
Category	Business
Inputs needed	Sales and marketing spend, New customers acquired, Monthly revenue per customer, Gross margin, Monthly churn
Main output	CAC payback period
Formula	Payback months = CAC ÷ (ARPU × gross margin)
Cost	Free — no sign-up, no download

How to use the CAC Payback Period Calculator

1Enter total sales and marketing spend for the period.
2Enter the number of new customers it produced.
3Add revenue per customer, gross margin and monthly churn.

Inputs explained

Sales and marketing spend($): Enter the sales and marketing spend in $.
New customers acquired: Enter the new customers acquired you are working with.
Monthly revenue per customer($): Enter the monthly revenue per customer in $.
Gross margin(%): Enter the gross margin in %.
Monthly churn(%): Enter the monthly churn in %.

Worked example

Using the values the calculator loads with:

Inputs

Sales and marketing spend120000 $
New customers acquired80
Monthly revenue per customer240 $
Gross margin78 %
Monthly churn2.5 %

Results

CAC payback period8 months
Customer acquisition cost$1,500.00
Gross margin per customer per month$187.20
Expected customer lifetime40 months
LTV$7,488.00
LTV:CAC ratio4.99:1
BenchmarkHealthy — under 12 months

Frequently asked questions

Should CAC include salaries?

Yes — fully loaded CAC includes sales and marketing salaries, commissions, tools and ad spend. Ad-only CAC flatters the number badly.

What LTV:CAC ratio should I aim for?

3:1 is the classic target. Much higher can mean you are under-investing in growth; below 2:1 the model is usually unsustainable.

What do I need to enter into the CAC Payback Period Calculator?

Just 5 values: sales and marketing spend, new customers acquired, monthly revenue per customer, gross margin, monthly churn. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.

How does the CAC Payback Period Calculator work out the answer?

CAC payback = customer acquisition cost ÷ (monthly revenue per customer × gross margin). Under 12 months is the usual SaaS benchmark. It applies the formula Payback months = CAC ÷ (ARPU × gross margin) and shows the working so you can check each step by hand.

Is the CAC Payback Period Calculator free, and do I need an account?

It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.

Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.