How to Reduce Customer Acquisition Cost (CAC)

"September was my record for enrollments. And I've never had so little money in the account."

Susan said this with her mouth full of bagel, at a deli across from the accounting office, in Columbus. It was 12:15 on a Friday. She had gone to drop off the month's receipts and ended up having lunch with Rick, the accountant who had handled her music school for six years.

Rick didn't answer. He pulled a napkin from the dispenser, took the pen out of his shirt pocket and wrote three lines.

"Let's find out what each new student cost."

Line 1: everything you spent to bring in new people

"How much was ad spend in September?" "Twenty-four hundred." "And the front desk gets a commission per enrollment, doesn't she?" "Fifteen dollars each." "Thirty enrollments, four hundred fifty. And the flyers, the freebies for the trial lesson?" "About a hundred fifty."

Rick added it up: three thousand dollars. Susan was surprised. To her, the cost of getting a student was the ad. The commission was "the front desk's," the freebies were "supplies."

"Everything you spend to win a new customer goes here," he said. "If it weren't to bring in students, you wouldn't spend it."

Line 2: how many new customers came in

"Thirty new students. Only the new ones. Re-enrollments don't count, and neither do people who came back after a semester off."

That detail seems small, and it's where a lot of math gets lost. Mixing old customers with new ones makes the number look good and be false.

Line 3: the division

Three thousand divided by thirty. One hundred dollars.

"Each new student cost you a hundred dollars," said Rick. "That's your CAC."

What is CAC and how do you calculate it?

CAC, or customer acquisition cost, is how much a business spends, on average, to win each new customer. The math is simple: add up everything invested in marketing and sales over a period (ads, commissions, materials, freebies, tools, events, referral rewards and the share of salary of whoever sells that goes toward finding new customers) and divide by the number of new customers who came in during the same period.

CAC = total spent to win customers ÷ number of new customers

Three precautions keep the number honest:

1. The same period on both sides. September's spending divides September's customers. If your sales cycle is long, use three months on both sides.

2. Only new customers in the denominator. Repeat purchases and renewals are great, but they have a different calculation.

3. The cost of delivering doesn't count. Teachers, studio rent and course materials are costs of the service, not of acquisition.

CAC on its own doesn't tell you whether you're doing well or badly. It has to be compared with how much margin the customer leaves while they stay with you.

Rick turned the napkin over for this part. Tuition at the school was $140 a month, and about $40 per student was left after paying the teacher and rent. A student stayed, on average, five months. Two hundred dollars of margin per student, and a hundred of it was already gone before the first lesson.

"You paid half of what the student leaves you just to bring them in. In March it was $55 per student. The ads got more expensive and you kept buying."

The same napkin, another school

Rick hesitated, then spoke without naming names.

"I have another client with a school of the same size, on the other side of town. He also enrolled 30 in September. He spent fifteen hundred."

It was Walter. And what separated the two wasn't the lessons, the price or the quality of the teachers. It was where the students came from.

All 30 of Susan's students came from the same place: ads. Walter's came from three:

Ads: 8 students. Adding the spend and commissions, about $88 per student, almost the same as Susan was paying.

Referrals: 13 students. The person who referred got a month of lesson books, which cost the school $23. With the commission, about $37 per student.

Partnerships with companies: 9 students. Walter had held a breakfast presentation at two companies in the area, with HR promoting the lessons to employees. Around $35 per student.

Walter's CAC came to $50. Half of Susan's, with the same number of enrollments.

He hadn't discovered a magic ad. His ads cost almost the same. He had just stopped depending on them.

Why CAC climbs when a business depends on a single channel

Every channel wears out when it's the only one. With ads, you compete for the attention of the same audience against more and more competitors, and whoever competes in an auction pays more. In the same city, the people who were going to respond to your ad have already responded; the next ones cost more to convince. And whoever depends on one channel has nowhere to run when it gets pricier: they pay, because stopping means zero enrollments.

The way out isn't cutting the ads. It's putting next to them channels that bring customers at a lower cost, and calculating CAC for each one separately, as Walter did.

The channels that usually bring in customers more cheaply

Every business has its own, but a few appear often among those with the lowest cost to test:

Referrals with a reward for both sides. The person who refers and the person who is referred both get something. First step: pick a reward that costs you little and means a lot to the customer, and offer it at the moment they praise your service. We explain how to set this up in a referral program that really works.

Partnerships with whoever already has your customer. Companies, apartment complexes, complementary businesses. First step: list five businesses that serve the same audience without competing with you and propose a joint action to one of them.

Google Business Profile and reviews. Someone searching "music lessons near me" already wants to buy. First step: complete the profile and ask every student of the month for a review.

Content that answers the customer's question. An article or video that answers what your customer searches keeps bringing people in months later, with no cost per click. First step: write down the ten questions customers ask most before buying.

Groups and communities where your audience already talks. First step: join two local groups and help before offering anything.

None of these is truly free: they cost time and consistency. But the cost per customer tends to be much lower than buying attention every day.

The back of the napkin

Susan put the napkin in her purse. Rick thought she'd throw it away on the way out.

She didn't. But she also didn't know where to start. Referrals, partnerships, Google, content, groups: each seemed like a whole project, and she had a school to run.

That's the point where most people get stuck: they know the CAC is high, they know they need other channels, and they don't know which ones exist for their type of business, which to test first or what it costs to try each.

The 100 Acquisition Channels Guide was made for that moment. It covers 100 channels in 10 parts, each with what it is, a practical example, the first step to test it, who it works best for and the cost to test: free, low, medium or high. That's where you see which channels could lower your CAC before you spend a dollar. The bonus worksheet scores each channel by cost, speed and fit so you can pick three, and the 30-day plan shows, day by day, how to launch the first and measure the cost per customer it brings in.

Next step

Don't depend on a single way to win customers

Everything in this article works better when new customers arrive every month. Most businesses depend on two or three channels and suffer when one of them slows down. The 100 Acquisition Channels Guide shows 100 ways to win customers, a practical example of each one and the first step to test it spending little or nothing.

• ✓The 100 channels, one by one, from the best known to the ones almost nobody uses
• ✓A practical example and a low-cost first step for each channel
• ✓A simple way to choose the channels that fit your business now
• ✓Bonus: Channel scorecard
• ✓Bonus: 30-day test plan

Get the 100 acquisition channels guide for $49

One-time payment · Instant access · 7-day guarantee

Access is immediate, as a PDF, and Hotmart guarantees seven days to check whether it suits you. It costs less than a lunch, and on the first read you find out which doors your business still hasn't opened.

Do the math on your own napkin today. Then pick one cheap channel and measure it for 30 days. CAC doesn't fall with promises. It falls when customers start arriving through more than one door.

Rick, Susan and Walter are characters created for this text.

Frequently asked questions

How do I calculate my business's CAC?+

Add up everything spent to win new customers in a period (ads, commissions, materials, tools, events and the share of salary of whoever sells that goes toward it) and divide by the number of new customers in the same period. Don't include repeat purchases or the cost of delivering the product or service. If your sales cycle is long, use three months.

What is a high CAC?+

CAC is high when it eats a large part of the margin the customer leaves while buying from you. That's why it should always be compared with that margin and not analyzed alone. If you pay almost everything the customer will leave just to bring them in, every new sale works harder for the channel than for the business.

How do I reduce customer acquisition cost?+

Calculate CAC by channel, find out which is most expensive and put lower-cost channels next to it, such as structured referrals, partnerships, a Google profile and content. Test one at a time, for 30 days, measuring the cost of each customer it brings in. Cutting the expensive channel all at once, with no alternative, usually brings sales down.

Does The 100 Acquisition Channels Guide show which channels cost less?+

Yes. Each of the 100 channels is classified by cost to test (free, low, medium or high), with the first step and who it works best for. The bonus worksheet helps you choose three channels by cost, speed and fit, and the 30-day plan shows how to test the first. It has immediate access and a seven-day guarantee through Hotmart.

Does it work for my type of business?+

Yes. The channels cover local businesses, service providers, online stores, B2B companies and professionals. The guide helps you pick the ones that fit your case.

How do I receive the guide?+

Right after payment, Hotmart sends the access to your email. You can read it on your phone, computer or print it.

What if I don't like it?+

You have a 7-day guarantee. If it isn't for you, ask for a refund through Hotmart within that period.

The 100 Acquisition Channels Guide

100 ways to win customers without depending on a single source of sales

Get the 100 acquisition channels guide for $49

One-time payment · Instant access · 7-day guarantee