CAC vs LTV: The Only Two Marketing Numbers That Matter

If you only ever track two marketing numbers, make them these: what it costs to win a customer (CAC) and what a customer is worth (LTV). Together they tell you whether your marketing makes money — and how aggressively you can grow.

Most owners have never calculated either. Here's how.

Customer acquisition cost (CAC)

Add up everything you spent on marketing and sales in a period, then divide by the number of new customers it produced. Spent $10,000 and won 20 customers? Your CAC is $500. That's the real price of a customer — not the cost of a click or a lead.

Lifetime value (LTV)

The total profit a customer generates over the whole relationship — not just the first sale. A customer worth $400 on the first job who returns for years and refers others might be worth $5,000+. Retention is what makes this number big.

The ratio to aim for

Compare the two. If a customer is worth $5,000 and costs $500 to acquire, that's a 10:1 return — you should spend more, not less. A healthy LTV:CAC ratio is often cited as 3:1 or better. Below 1:1, you're losing money on every customer.

What to do with it

These two numbers answer the question every owner asks — "how much should I spend on marketing?" If the return is strong, fund it as hard as you can. If it's weak, fix the offer or the funnel before spending more.

Improve both

Lower CAC by tightening targeting and follow-up and leaning on referrals. Raise LTV by keeping customers longer and pricing for value. Move both and the whole business gets more valuable.

The takeaway

Marketing stops being a guessing game the moment you know your CAC and LTV. They're the numbers behind every confident decision to scale.

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Quinn Consolidated helps founders turn marketing into measurable maths. If you're spending without knowing the return, let's talk.