How do you calculate customer acquisition cost?

Total acquisition spend divided by the customers it produced. The version most businesses actually need is built from the funnel: cost per lead, divided by the share of leads that are qualified, divided by the share of those that close. That tells you where the cost is coming from, not just what it is.

What is my real cost per customer?

Cost per lead divided by the share of leads that are qualified, divided by the share of those that close. Most businesses only know cost per lead, which hides the real number. A lead is an inquiry; a customer is a sale, and the gap between the two costs is usually larger than people expect.

What is a healthy lifetime value to acquisition cost ratio?

Three to one is a common target, but only when it is measured on gross profit rather than revenue. A revenue-based ratio almost always looks healthier than the real one, because it counts money that never reaches your bottom line.

Why does my ad platform send worse leads over time?

Because it optimizes toward what it can measure. If closed-deal outcomes never flow back to Google or Meta, they learn from form fills instead of customers, and get progressively better at finding cheap inquiries that never buy. Closing that loop is what stops it.

CAC Calculator

Find out whether your goal, your budget, and your numbers actually line up.

Most businesses set an ad budget and a growth goal that were never connected to each other, or to what a customer actually costs them. This checks all three against each other, tells you whether they hold together, and if they do not, which one to change.

Before you start

Built for owners and marketing leaders already running paid ads.

In about three minutes you get a clear read on whether the plan holds together, and where it breaks if it does not. Estimates are fine. If a number is a guess, mark it Not sure. That answer is useful in itself, because a number you cannot state is one your marketing team cannot optimize toward either, and a team guessing at the target often optimizes against it: chasing efficiency when you wanted growth, or the reverse.

What you walk away with

Whether your budget can mathematically produce the goal you set, and the size of the gap if it cannot
What one customer really costs you to win, which is the number the whole plan rests on and is rarely what a lead costs
Which lever to pull when they do not line up: the budget, the goal, your margins, or what your ad platforms can see

Have these handy if you can

Your monthly ad spend
Your average cost per lead
What an average customer is worth

No exact figures needed. Directional numbers still produce a useful read.

Your current numbers

Monthly ad spend

Average cost per lead (CPL)

Lead to qualified rate

Of the leads you get, what share are genuinely qualified?

Qualified to customer close rate

Of your qualified leads, what share become paying customers?

How do customers pay you?

This shapes the right questions to ask about customer value.

Average purchase value

What a customer pays you, on average, for that one purchase.

Contribution margin %

Revenue minus variable costs, before fixed overhead. Add this to see the profit-based ratio.

Your goal

New revenue goal from ads

Total new revenue you want ads to bring in during the window below, not a monthly run rate.

Over what window?

Optional depth

Sharpens the result. Skip if you do not have it.

Total monthly fixed costs

Overhead, salaries, software. Leave blank to skip.

Do your ad platforms see what happens after the lead?

Cash and working capital

Optional. A directional estimate of the cash this level of spend ties up.

How long is your sales cycle?

Typical time from first contact to a closed, paid customer.

Sales cycle length (months)

Leave blank to skip this section.

See your diagnosis

Last one. We read your numbers back to you and tell you what they mean.

Fill in enough above for us to work out what a customer costs you and what one is worth, and this unlocks. You do not need every field, and Not sure is a valid answer to most of them.

Your results build here as you fill in the form.

Locked · Your real cost per customer

Unlock with CPL, qualified rate, and close rate. No rates? Tap Not sure to estimate.

Locked · Lifetime value to acquisition cost

Unlock with your real cost per customer plus revenue per customer.

Locked · Budget reality check

Unlock with your real cost per customer and your revenue goal.

Locked · Fixed cost coverage

Optional. Unlock by adding monthly fixed costs and contribution margin.

Locked · Cash and working capital

Optional. Unlock by adding sales cycle and margin.

What this assumes

Your budget is spent evenly across the window, so new customers arrive at a steady rate rather than in bursts.
Your cost per customer holds as you scale. In practice it usually creeps up once you exhaust the cheapest demand, so treat this as the optimistic end.

None of these make the answer wrong, they make it a model. Directional inputs give you a directional answer, which is enough to decide what to do next.

Your diagnosis

The diagnosis unlocks once CAC, ratio, and budget check are all filled in.

Common questions

How do you calculate customer acquisition cost?: Total acquisition spend divided by the customers it produced. The version most businesses actually need is built from the funnel: cost per lead, divided by the share of leads that are qualified, divided by the share of those that close. That tells you where the cost is coming from, not just what it is.
What is my real cost per customer?: Cost per lead divided by the share of leads that are qualified, divided by the share of those that close. Most businesses only know cost per lead, which hides the real number. A lead is an inquiry; a customer is a sale, and the gap between the two costs is usually larger than people expect.
What is a healthy lifetime value to acquisition cost ratio?: Three to one is a common target, but only when it is measured on gross profit rather than revenue. A revenue-based ratio almost always looks healthier than the real one, because it counts money that never reaches your bottom line.
Why does my ad platform send worse leads over time?: Because it optimizes toward what it can measure. If closed-deal outcomes never flow back to Google or Meta, they learn from form fills instead of customers, and get progressively better at finding cheap inquiries that never buy. Closing that loop is what stops it.

Not sure what your numbers are telling you?

Walk through your real marketing math with us. We'll show you where the plan breaks and what to do about it, no spend increase required.

Get Your Free System Review