CAC (Customer Acquisition Cost)

The average cost of winning one new customer — the price tag on growth, and the number every paid-acquisition decision ultimately turns on.

In plain English

CAC answers a deceptively simple question: when you add up everything you spent to bring in customers, how much did each one cost? That spend includes ad budgets, the salaries of the people running marketing and sales, the tools they use, and any agency fees. Divide the total by how many customers you actually won and you get CAC. On its own it's just a price — a high CAC isn't bad and a low one isn't automatically good. CAC only becomes meaningful when you weigh it against what those customers are worth and how quickly they pay you back.

The formula

CAC = Total sales & marketing spend ÷ New customers acquired (same period)

Keep the numerator and denominator in the same window, and decide upfront whether you're using a fully-loaded CAC (including salaries) or a leaner ad-only blended figure — mixing the two distorts every comparison.

A worked example

Imagine that last quarter you spent €60,000 on sales and marketing combined, and in that same quarter you signed 50 new customers.

CAC = €60,000 ÷ 50 new customers = €1,200

So it cost you €1,200 on average to win each customer. Whether that's a smart price depends entirely on the next step: if each customer is worth €4,000 over their lifetime, you're tripling your money; if they're worth €1,000, you're losing on every one.

What's a good CAC?

There's no universal "good" CAC — the same €1,200 can be excellent or ruinous. It's only meaningful relative to value, so benchmark it through LTV:CAC and payback:

How CAC stacks up	Verdict	What it means
LTV:CAC ≥ 3 and payback < 12 mo	Healthy	Efficient, reinvestable growth
LTV:CAC 1–3 or payback 12–18 mo	Workable	Acceptable, watch the trend
LTV:CAC < 1 or payback > 24 mo	Unprofitable	You lose money on each customer

The takeaway: never look at CAC alone. A "high" CAC is fine if those customers are valuable and loyal; a "low" CAC is worthless if they churn before they ever pay you back.

Frequently asked questions

How do you calculate CAC?

Add up all sales and marketing spend over a period — ad budget, salaries, tools, agency fees — and divide by the number of new customers acquired in that same period. For example, €60,000 of spend and 50 new customers gives a CAC of €1,200.

What is a good CAC?

There's no universal good CAC because it depends on what a customer is worth. A €1,200 CAC is great if customers are worth €10,000 and terrible if they're worth €800. Judge CAC against LTV — aim for an LTV to CAC ratio of at least 3 to 1 — and against payback period, ideally under 12 months.

What costs should be included in CAC?

Everything you spend to acquire customers: paid media, content, sales team salaries and commissions, marketing software, and agency or contractor fees. The fully-loaded version includes salaries; a blended ad-only version is easier to track but understates true CAC.

CAC payback period · LTV:CAC ratio · Customer lifetime value (LTV) · Trial-to-paid conversion rate

Learn more

The complete guide to value-based bidding · Value-based bidding without a data team