Two pharmacies in Abuja advertise on the same Google keywords.
Pharmacy A thinks a customer is worth one order, about ₦12,000 in profit. So when clicks get expensive, the owner panics and pulls the ads. Pharmacy B knows its average customer comes back four times a year for three years and is worth ₦144,000. It keeps bidding, happily pays ₦40,000 to win a customer, and takes the whole neighbourhood.
Pharmacy A’s owner thinks Pharmacy B is either reckless or has a very rich uncle. Neither is true. Pharmacy B knows two numbers, and Pharmacy A doesn’t.
Most Nigerian businesses can’t say, in naira, what it costs them to win a customer, or what that customer is worth once won. A rough feeling doesn’t count.
Every marketing decision you make, like how much to bid, which channel to fund, whether an agency fee is expensive, whether to discount or whether a campaign “worked”, is secretly a bet on those two numbers. Businesses that know them make marketing decisions like investors. Businesses that don’t make them like gamblers with a lucky feeling. This guide moves you from the second group to the first, using arithmetic you already have the records for.
What It Costs to Win a Customer
Customer acquisition cost (CAC) is everything you spend to win customers in a period, divided by the customers you won in that period. The trap sits in the word “everything”.
The flattering version counts ad spend only. The true version counts ad spend, plus agency or freelancer fees, plus marketing tools, plus the salaries (or share of salaries) of the people doing the marketing and selling, because all of it was spent to produce those customers.
If you spent ₦2.4M across all of that last quarter and won 60 customers, your CAC is ₦40,000. It’s simple and instantly clarifying, because most businesses have never seen the fully loaded number. The first time is usually a “chai” moment.
Two refinements make CAC useful.
CAC by channel. A blended CAC hides everything interesting, because the point is comparison. If referrals win customers at ₦8,000 and cold paid social at ₦95,000, your next budget decision writes itself. This needs attribution you can trust, which is why measurement comes first. Broken tracking blurs the reports and pins your CAC on the wrong channels.
CAC by customer type. The customer who came for the discount and the one who came for the outcome may cost the same to win and be worth wildly different amounts. That brings us to the second number.
What a Customer Is Actually Worth
Lifetime value (LTV) is the profit, after costs, that a customer generates across their whole relationship with you. A workable version for most businesses is average order profit × purchases per year × years they stay.
A customer spending ₦30,000 per order at a 40% margin, four times a year, for three years, is worth ₦144,000. Their first order on its own brings in ₦12,000 of profit.
That gap between first-order worth and lifetime worth is the most consequential blind spot in marketing. Businesses that only see the first order consistently underbid for customers their competitors would happily and profitably fight for. Just ask Pharmacy A.
The business that knows a customer is worth ₦144,000 can afford ₦40,000 to win one. The business that thinks a customer is worth one ₦12,000 order can afford almost nothing. It gets outbid, out-advertised and out-grown by the first business, while wondering how anyone can possibly afford those ads. What looks like recklessness is a number they can see and you can’t.
The Ratio That Turns Two Numbers Into Decisions
Divide LTV by CAC and you get the health check for your whole marketing operation. The common rule of thumb is that around 3 to 1 is healthy. The customer is worth about three times what they cost, which leaves comfortable room for service costs, repeat-purchase risk and mistakes.
Mr Micawber in Dickens’s David Copperfield had the idea 175 years early. Spend slightly less than you earn and you’re happy. Spend slightly more and you’re miserable. Swap income for customer value and spending for acquisition cost, and that’s the ratio.
Meaningfully below that, growth is buying revenue with shrinking margins. Far above it, say 8 to 1, usually signals underinvestment. You’re winning customers so cheaply that you should be buying more of them before competitors notice.
Alongside the ratio, watch your payback period, the number of months until a customer’s profit repays what you spent to win them. In a cash-tight economy, a business with a healthy 3 to 1 ratio but an 18-month payback can still suffocate. Given Nigerian working-capital reality, payback is often the tighter constraint of the two. Ask anyone who has waited 120 days for a client to pay an invoice.
What Changes Once You Know Them
- Bidding stops being guesswork. Knowing your affordable CAC per customer type is what makes value-based bidding possible. You can tell the ad platforms what a lead is worth, and rising click costs become survivable arithmetic instead of vague dread.
- Retention gets its budget back. The moment LTV is visible, the cheapest growth lever becomes obvious, which is extending it. Add one purchase a year, or one more year of loyalty, and every customer becomes worth more at almost no acquisition cost. That’s the whole economic case for the email and WhatsApp programmes most budgets starve.
- Vendors and channels become comparable. “Is ₦500k a month for marketing expensive?” can’t be answered. “Does it produce customers below our affordable CAC?” is a yes-or-no question with an invoice attached.
- Discounting shows its real cost. A discount that wins a low-value bargain hunter and trains them never to pay full price shows up in these numbers as exactly what it is.
Start Rough, Then Sharpen
The perfect version of this analysis needs cohorts, margins by product line and clean attribution. Don’t wait for it.
The rough version takes an afternoon with the records you already have. You need one quarter’s true total marketing cost, the customers won, your average order profit, and honest guesses at how often customers buy and how long they stay. It will already change decisions. Then improve the inputs month by month as your measurement improves. The only wrong version is the one that never gets calculated because it couldn’t be perfect.
Do the Arithmetic This Week
Take last quarter’s total marketing spend, including fees and staff time, and divide it by the number of new customers it produced. Then work out what an average customer brings you in gross profit over a year.
If the second number isn’t comfortably bigger than the first, that’s the problem to fix before you spend more, and now you know how big it is.
Do the Arithmetic Before the Next Click
Pharmacy A switched its ads back on last month. This time the owner had worked out what a regular customer is worth, and the expensive clicks suddenly looked cheap.
When these two numbers are invisible, the gap is usually in Measure. Check yours with the free 2-minute diagnostic.
P.S. If you spend ₦1M or more a month on marketing, you also qualify for a free Leak Check. That’s thirty minutes, three leaks and a calculator on the table.
The pharmacies are illustrative. Ratios cited, such as 3 to 1 LTV to CAC, are widely used industry rules of thumb, and the right thresholds vary by margin structure, capital position and growth stage. This article is general information, not financial advice.
Related. To measure conversion at each stage, use our sales pipeline template.
This article covers one part of a bigger system. Our guide to digital marketing in Nigeria shows how the four walls fit together, and the order to build them in.
