How do you calculate CAC and what goes into it?

CAC is all marketing and sales spending over a period, divided by the number of new customers in the same period. The spending includes not only the ad budget but marketer and salesperson salaries, software, the agency fee and creative production. A common mistake is counting only the ad budget and getting a pretty but dishonest CAC.

How do you calculate LTV for different types of business?

The base LTV formula is average order value × number of purchases over the lifetime × margin. For one-off services, LTV equals the profit from a deal plus repeat orders. For subscriptions, LTV runs through average monthly revenue per customer divided by monthly churn. For e-commerce, through purchase frequency and order value over the retention period.

What LTV to CAC ratio is considered healthy?

The benchmark is an LTV roughly three times higher than CAC. A 1 to 1 ratio means breaking even. 3 to 1 is a healthy business with room to grow. Above 5 to 1 often means you are underinvesting in marketing and could grow faster. The exact benchmark depends on the industry and the payback cycle.

What is unit economics and why does a small business need it?

Unit economics is the calculation of profitability per single unit: customer, deal, order. It answers whether you earn or lose on each customer. A small business needs it so as not to scale a loss: if you are in the red on a customer, more advertising only speeds up the loss of money.

How are CAC, CPO, CPL and CPC different?

CPC is the cost of a click. CPL is the cost of a lead (a request, contact). CPO is the cost of a placed order. CAC is the cost of a customer who actually paid. It is a funnel sequence: a click becomes a lead, a lead an order, an order a customer. At each transition a share drops off, so CAC is always higher than CPC and CPL.

Metrics and unit economics

CAC, LTV and Unit Economics: Formulas, Examples and Calculators

The ads run, leads come in, managers close deals. And yet at the end of the month the account is somehow thin. Sound familiar? Most often the reason is one: the business counts revenue but does not count how much each customer costs and how much they bring over their lifetime.

That is exactly what unit economics is – the calculation of profit per single customer, deal or order. Without it, scaling ads is like pouring water into a leaky bucket: the more you pour, the faster it drains. The two metrics that close this question are CAC and LTV. How much you pay for a customer, and how much they bring you.

In this article we will break down both with formulas and examples, show how they add up to unit economics, and give you calculators to run your own numbers right now instead of putting it off into a spreadsheet for later.

CAC: how much a customer costs

CAC (Customer Acquisition Cost) shows how much one new customer who actually paid costs you. The formula is simple:

CAC = all marketing and sales spending / number of new customers

The key word is all. The most common mistake: people put only the ad budget into the spending and get a pretty figure that means nothing. An honest CAC includes marketer and salesperson salaries, software and CRM fees, the agency fee, creative production, discounts and acquisition bonuses. Everything you spent to make the customer say “yes.”

An example. Over a month you spent UAH 60,000 on advertising, UAH 30,000 on a marketer’s salary and UAH 10,000 on software – UAH 100,000 in total. That month you acquired 50 new customers. CAC = 100,000 / 50 = UAH 2,000 per customer. If you counted only the ads, you would get UAH 1,200, 40% below the real figure. Businesses go bust on exactly this gap.

Plug your own last-month numbers into the formula – all ad spend, marketing salaries, software – and divide by the number of paying customers. The figure you get is your real CAC. If it surprises you, you are in good company: it tends to surprise everyone who used to count only the media budget. To skip the manual math, drop your numbers into the CAC calculator – it returns the cost per customer with all the spending factored in.

CAC on its own still tells you nothing. UAH 2,000 per customer – is that a lot or a little? It depends on how much the customer brings. So CAC is always read in a pair with LTV. But first, let us see why CAC is so easy to confuse with other funnel metrics.

CPC, CPL, CPO, CAC: where the difference is

These four abbreviations sound alike and get confused constantly. In fact they are sequential points of a single funnel, and at each transition a share of people drops off.

Metric	What It Measures	When the Customer
CPC	Cost per click	Simply visited the website
CPL	Cost per lead (inquiry, contact, or phone call)	Left their contact information
CPO	Cost per completed order	Placed an order but may not have paid yet
CAC	Customer acquisition cost (paying customer)	Actually generated revenue

A click becomes a lead, a lead becomes an order, an order becomes a paid customer. At each step a share falls away, so CAC is always higher than CPL, and CPL higher than CPC. When a contractor reports a pretty CPC but you see no profit, look further down the funnel: the clicks may be cheap while only one in twenty reaches payment.

CPO follows the same logic: divide total ad spend over a period by the number of placed orders. The metric sits between CPL and CAC – the order exists, but the customer has not necessarily paid yet. It pays to keep CPO and CAC side by side: the gap between them shows where orders fall off before reaching payment.

«A cheap click does not mean a cheap customer. I have seen accounts where the CPC was three times below market and the CAC was twice as high: traffic flowed, but barely anyone reached payment. The metric to read is the one at the end of the funnel, not the start».

– Volodymyr Kashalaba, CEO Guild of Marketing

LTV: how much a customer brings

LTV (Customer Lifetime Value) shows how much profit a customer brings over the whole period of working with you. It is the second half of the equation: CAC is what you pay, LTV is what you get.

LTV = average order value × number of purchases × margin

Note the margin. LTV is counted in profit, not in revenue. If a customer bought UAH 50,000 worth over a year and your margin is 30%, they brought you UAH 15,000, not UAH 50,000. You have to compare profit to CAC, otherwise the picture looks rosier than reality.

The LTV formula varies by type of business:

E-commerce: average order value × purchase frequency per year × number of years retained × margin. A customer who orders once a quarter for three years is worth more than a one-time buyer with the same order value.
One-off-purchase services: profit from the deal plus repeat orders and referrals. LTV is often underestimated here, because people forget to count those who come back and bring others.
Subscription (SaaS): average monthly revenue per customer divided by monthly churn. If a customer pays UAH 1,000 a month and you lose 5% of the base each month, the average customer stays about 20 months and brings UAH 20,000.

To calculate LTV for your own model, take the average order value, purchase frequency over a period and margin – and multiply them. For a subscription model the formula is simpler: monthly revenue per customer divided by monthly churn. The key is to count in margin, not in revenue, or LTV will come out two or three times overstated and the comparison with CAC loses meaning. The fastest way to run your figures is the LTV calculator – it handles both the one-off model and a subscription with churn.

LTV is also an argument for working with your existing base. Acquiring a new customer costs more than selling to someone who already bought. So businesses that count LTV invest in retention: email marketing, repeat sales, loyalty programs. That raises LTV without raising CAC, the cheapest way to grow profit per customer.

The LTV to CAC ratio

This is where the two metrics meet and answer whether your business is healthy. You look at the ratio of LTV to CAC.

LTV : CAC = what a customer brings : what it costs to acquire them

1 to 1 – you break even. You got back what you put into acquisition. There is no business, just money circulating.
3 to 1 – the healthy benchmark. A customer brings three times more than they cost. There is something to reinvest into growth.
5 to 1 and above – often a sign that you are underinvesting in marketing and growing slower than you could. You can invest in acquisition more boldly.

Back to the example. CAC = UAH 2,000. If the customer’s LTV in profit is UAH 6,000, the ratio is 3 to 1, healthy. If LTV is UAH 2,200, you are barely in the black, and any rise in ad costs makes you unprofitable. If LTV is UAH 1,800, you pay more for a customer than they bring, and every new deal deepens the minus.

«The most dangerous situation is when a business with negative unit economics decides to “scale” through more advertising. That is scaling a loss. First get the economics on a single customer into the black, and only then add budget».

– Volodymyr Kashalaba, CEO Guild of Marketing

Payback period: when a customer returns what was spent

The LTV to CAC ratio shows whether a customer is profitable in principle. But there is a second question that decides whether your business survives growth: when exactly the customer pays back the cost of acquiring them. That is the CAC payback period.

This is exactly why companies with excellent LTV to CAC sometimes go bust during fast growth: the economics are healthy, but there is no money in the account because it is all tied up in acquisition that will pay back tomorrow. For a one-off-purchase business the payback is instant, the customer pays at once. For a subscription or installments it is months, and they have to be financed. The benchmark for a healthy payback period is up to 12 months, and for many niches shorter is preferable.

A profitable customer and a customer who pays back fast are not the same thing. I have seen businesses with excellent LTV to CAC run into a cash gap on growth, because they forgot to count when exactly the money comes back. Profit on paper and money in the account live in different timeframes. – Volodymyr Kashalaba, CEO Guild of Marketing

Unit economics: putting it all together

Unit economics is the view of a business through the unit: one customer, one deal. It pulls together CAC, LTV and margin and answers the main question – do you earn or lose on each customer.

Simplified, profit per customer is LTV minus CAC. If a customer brings UAH 6,000 of profit and costs UAH 2,000, you earn UAH 4,000 on each. Multiply by the number of customers and there is your profit from acquisition. And if a customer costs more than they bring, that same multiplier works against you.

Why this is critical before you invest in advertising:

Advertising scales what already exists. It makes positive economics a bigger plus and negative economics a bigger minus.
Unit economics shows the CAC ceiling: the maximum you can pay for a customer and stay in the black. Without that figure you do not know when to stop raising bids.
It also points to where to look for growth: lower CAC (better targeting, cleaner funnel) or raise LTV (repeat sales, upsell, retention).

Calculate your unit economics

Pull CAC, LTV and margin into one picture and see the profit per customer.

Unit economics is the foundation of a marketing strategy. Without it, any plan boils down to “let’s run more ads and see.” With it, you know which channel pays off, how much you can invest and when the business will start bringing profit rather than revenue. If you are planning growth seriously, it is worth building these figures into a marketing strategy at the start rather than discovering the problem six months into burned budgets.

A worked example: an online store's economics

Theory becomes clear on numbers. Let us take a hypothetical online store and run the whole calculation the way we do it in an audit. The numbers are illustrative, but the proportions are realistic for a Ukrainian e-commerce niche.

Inputs for the month:

Ad spend: UAH 80,000.
Marketer salary and software: UAH 35,000.
Total acquisition: UAH 115,000.
The ads brought 1,000 clicks, 200 requests, 50 paid orders.
Average order value: UAH 1,800, margin 35%.

Counting the funnel:

CPC = 80,000 / 1,000 = UAH 80 per click.
CPL = 80,000 / 200 = UAH 400 per request.
CPO and CAC: 115,000 / 50 = UAH 2,300 per customer (here CPO and CAC coincide, because every order was paid).

Counting the customer’s value. Profit from one order: 1,800 × 35% = UAH 630. At first glance a disaster: a customer costs UAH 2,300 and brings UAH 630. The store is deep in the red on every customer.

But this is a repeat purchase. The data shows the customer comes back on average three more times a year. Then LTV = 630 × 4 purchases = UAH 2,520 of profit. Now the picture is different: LTV 2,520 against CAC 2,300, a ratio just above 1 to 1. The store is barely in the black – alive, but not growing.

What this tells the owner. The current model is on the edge. There are two options: lower CAC (clean up the ads, switch off channels with expensive clicks, raise site conversion) or raise LTV (increase repeat purchase frequency through email and retargeting, raise the average order value through upsell). Most often a combination works: a little here, a little there, and the ratio moves from 1.1 to 1 up to a healthy 2.5 or 3 to 1.

Without this calculation the owner would see only “UAH 90,000 in revenue a month” and assume all was well, until the money quietly ran out. Unit economics shows the problem before it becomes a cash gap.

CPL is calculated the same way: ad spend over a period divided by the number of leads – requests, enquiries, contacts. The metric is intermediate and misleading on its own: a cheap lead may never pay, while an expensive one can bring the most profitable customer. CPL only makes sense in a pair with CAC and unit economics; alone, it pushes you to optimize for a pretty number at the top of the funnel.

ROI and ROMI: does the investment pay off

Two metrics that often travel alongside CAC and LTV, because they answer the question of payback overall rather than per customer.

ROI (Return on Investment) is the payback of all investment. How much profit you got on each hryvnia put in. ROMI (Return on Marketing Investment) is the same but only about marketing spending. ROMI answers more narrowly: does the advertising and promotion specifically pay off.

ROMI = (profit from marketing − marketing spend) / marketing spend × 100%

A ROMI of 0% means marketing broke even. A ROMI of 200% means each hryvnia invested brought two hryvnias of profit above what was put in. A negative ROMI means the advertising takes more than it brings, and here unit economics is already shouting about a problem.

The difference between ROI and ROMI is simple but important. ROI accounts for all investment in the business: product, rent, salaries, advertising. ROMI is narrower and more honest about marketing – it isolates the ad spend specifically and shows whether it is worth the money on its own. To assess a specific ad channel, look at ROMI; for the health of the business overall, ROI.

Calculate ROI and ROMI

Check the payback of your investment overall and of marketing separately.

Calculate ROI and ROMI

Check the payback of your investment overall and of marketing separately.

When you have CAC, LTV, unit economics and ROMI counted, you see the business in numbers rather than in feelings. That is the moment it becomes visible which ad channel pulls you up and which quietly eats the profit. If you want someone to line these numbers up against the data in your ad accounts and tell you honestly where you are leaving money on the table, that is the job of an advertising audit through the lens of CAC and LTV, not just clicks and impressions.

Volodymyr Kashalaba CEO Guild Of Marketing

Marketing specialist with over 11 years of experience, with a background as a sales department director. Founder and CEO of the Guild of Marketing.

FAQ

How do you calculate CAC and what goes into it?

CAC is all marketing and sales spending over a period, divided by the number of new customers in the same period. The spending includes not only the ad budget but marketer and salesperson salaries, software, the agency fee and creative production. A common mistake is counting only the ad budget and getting a pretty but dishonest CAC.
How do you calculate LTV for different types of business?

The base LTV formula is average order value × number of purchases over the lifetime × margin. For one-off services, LTV equals the profit from a deal plus repeat orders. For subscriptions, LTV runs through average monthly revenue per customer divided by monthly churn. For e-commerce, through purchase frequency and order value over the retention period.
What LTV to CAC ratio is considered healthy?

The benchmark is an LTV roughly three times higher than CAC. A 1 to 1 ratio means breaking even. 3 to 1 is a healthy business with room to grow. Above 5 to 1 often means you are underinvesting in marketing and could grow faster. The exact benchmark depends on the industry and the payback cycle.
What is unit economics and why does a small business need it?

Unit economics is the calculation of profitability per single unit: customer, deal, order. It answers whether you earn or lose on each customer. A small business needs it so as not to scale a loss: if you are in the red on a customer, more advertising only speeds up the loss of money.
How are CAC, CPO, CPL and CPC different?

CPC is the cost of a click. CPL is the cost of a lead (a request, contact). CPO is the cost of a placed order. CAC is the cost of a customer who actually paid. It is a funnel sequence: a click becomes a lead, a lead an order, an order a customer. At each transition a share drops off, so CAC is always higher than CPC and CPL.

Monamour

11:46 17 Jan 25

Допомогли створити точку на карті та налаштували контекст. Роботою задоволена, тепер набиваю базу постійних клієнтів.

Барановський Олег

11:28 28 Nov 24

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Тому працюємо далі і плануємо покращити сайт та збільшувати бюджет на рекламу.
Рекомендую!

Old School

12:19 12 Mar 24

Я дуже сумнівався чи наймати агенцію чи ні, але вирішив спробувати, бо все ж яка не яка гарантія є. Працюємо вже десь пів року. За цей час мені поправили сайт, результати є, навіть трохи перевиконали

Alex87 M

16:18 27 Feb 24

Супер,тільки позитивні враження, команда професіоналів свого діла, вирішила усі мої питання стосовно гугл акаунтів реклами, рекомендую, буду звертатись ще! Дякую.

Андрій Шевчук

09:52 06 Feb 24

Нам треба було збільшити кількість продаж на сайті і ми вирішили звернутися в цю компанію. За період співпраці ми ще запустили товарну рекламу в гугл та соцмережах. Ми задоволені, що нам не просто налаштовують рекламу, а роблять цілу стратегію залучення покупців, як догнати їх, якщо вони нічого не купили, дають рекомендації і завжди готові відповідати на наші питання.

Віталій Романчук

18:28 03 Feb 24

Займаємось ремонтом квартир, шукав спосіб отримати клієнтів в періоди простою. Родичі порекомендували Гільдію Маркетингу. Не було сайту, тому запустили рекламу в фейсбуці та інстаграмі. Люди пишуть я їм телефоную. Робота є. Замовив ще сайт, очікую що роботи буде ще більше, дякую.

11:32 31 Jan 24

Ми маємо власного маркетолога в команді, але вирішили протестити підрядників. Замовили рекламу в гуглі. Спочатку нам провели презентацію, все показали і порахували що ми отримаємо і скільки треба бюджету. Домовилися про перший пробний місяць. Результат нас влаштовує, заявок стало дійсно більше. Будемо працювати далі, сподіваємося далі отримати ще кращі результати.