Here’s a test. Without opening anything, tell me the most you can afford to pay for one new customer before your advertising starts losing money.
Most business owners can’t answer, and it has nothing to do with intelligence. Nobody ever put the numbers on one page. Campaigns get judged on clicks, on whether the phone felt busy this week, or on a platform dashboard that counts conversions generously. Meanwhile, whether the ad budget makes or loses money comes down to what a customer costs you, what a customer is worth to you, and what the exchange rate does to the first of those.
This calculator puts all three on the same page. Use it before you set a budget, and again every time a campaign comes up for review.
Naira paid-ad ROI calculator
Every default below is an illustrative placeholder, not a benchmark. Replace each one with your own numbers.
If the exchange rate moves against you
Honest Inputs Only
The calculator is simple arithmetic. The discipline lives in the inputs. Every field has a version that flatters you and a version that tells the truth, and most businesses lose money in the gap between the two without ever noticing.
Monthly ad budget
Enter what you actually spend on the platforms. Leave out agency fees, design and content production for now. They’re real costs, but mixing them in here hides whether the advertising itself pays back. Once you know the ads work, you can ask whether they work well enough to carry the overhead too.
Exchange rate
Use the rate you’re actually charged. The headline official rate is irrelevant if your bank adds a spread or you fund ad accounts through a third party at a markup. The difference is often several percent, and on a big monthly budget that’s real money that never shows up in a campaign report. The currency article explains why you should track spend in both currencies.
Cost per click
Take it from your own ad account, averaged over at least a month, in the currency you’re billed in. Never borrow a figure from a blog or a competitor. Cost per click swings wildly by category, targeting, season and ad quality, and a borrowed number turns every figure downstream into fiction. Haven’t run ads yet? Run a small test first and use the real numbers. The test is cheaper than a plan built on a guess.
Click-to-lead rate
Of everyone who clicks, what percentage becomes a genuine enquiry, like a form, a WhatsApp message or a call? Count leads from your own records. The platform’s conversion column routinely includes page views, duplicate submissions and actions that were never enquiries. If your CRM shows forty real enquiries and the ad platform claims ninety conversions, the answer is forty. The reporting guide explains why the platform number is usually the wrong one to trust.
Lead-to-customer rate
Most businesses have never measured this one, and it’s often the most revealing. If you don’t know yours, pull the last three months of enquiries and count how many paid. The number usually disappoints. When it’s low, more advertising almost never fixes it. Faster follow-up, clearer pricing or an actual sales process will. Response time is usually the first place to look.
First-purchase value and gross margin
Use gross profit. A ₦250,000 sale at a 40% margin is worth ₦100,000 to you, and that’s the figure your acquisition cost has to beat. Businesses that compare cost per customer against revenue consistently overspend, because they’re treating money that was always going to their suppliers as if it were theirs to spend on ads.
Expected purchases per customer
Leave this at 1 unless you have real repeat-purchase data. It’s the most tempting field to inflate, because raising it turns almost any losing campaign into a winner on paper. If your records show the average customer buys three times, enter 3. If you’re only hoping they will, enter 1 and treat retention as a bonus. The CAC and LTV guide covers the difference between those two positions.
What the Results Are Telling You
Break-even cost per customer is the number that matters most. It’s the most you can pay for a customer before the advertising starts losing money, and every campaign decision should be tested against it. If a channel’s cost per customer sits below it, your question is how far you can scale before costs rise. If it sits above it, tweaking click-through rates won’t save you, because the gap is built into the economics.
In The Martian, Mark Watney survives because he works out, early on, exactly how many days of food he has and what it’ll take to stretch them. Your break-even cost per customer is that calculation.
Profit after ad spend is deliberately blunt. It ignores overheads, agency fees and staff time, so a small positive number here can still be a loss for the business overall. Anything close to zero is a warning.
The exchange-rate table is the part most Nigerian businesses never model. It shows what happens to the same naira budget when the rate moves by 10, 20 or 30 percent. Your naira budget stays the same, so you buy fewer dollars, fewer clicks and fewer customers, while your prices stay where they were unless you act. A comfortably profitable campaign can slide into a loss after one rate move, and nothing in the ad dashboard will mention it.
Five Things Your Dashboard Won’t Tell You
- Whether your problem is traffic or conversion. Move the click-to-lead rate up one percentage point and watch the customer count. Then put it back and double the budget instead. For many businesses, the small conversion change beats doubling the spend, at a fraction of the cost. That’s the case for fixing landing pages before buying more traffic.
- Whether you can afford your market’s click prices at all. In some categories, click costs make paid acquisition unprofitable at typical Nigerian price points, full stop. The calculator shows this in seconds. When it does, lean on channels that don’t reprice with the dollar, like organic search, referrals and your own list, and stop paying to lose money.
- How exposed you are to the naira. If a 10% rate move wipes out your profit, your marketing carries a currency risk nobody has priced into the plan.
- Whether repeat business is carrying you. Set repeat purchases to 1, then to your real figure. If the campaign only works with repeat purchases included, retention is the whole business case for the advertising.
- What a realistic target looks like. Instead of “get more leads”, you can write a goal like “bring cost per customer from ₦X to under ₦Y by the end of the quarter”, knowing Y sits below break-even. That’s the difference between an objective and a hope.
Three Runs Before Any Budget Decision
Run it once with your current numbers. Run it again with the rate 20% worse. Then run it with your close rate halved, which is roughly what happens when a campaign scales into colder audiences or follow-up slips in a busy month. If the campaign stays profitable in all three, you’ve found a channel that can take more budget. If it only survives the first, it’s fragile, and your budget should say so.
What It Deliberately Leaves Out
It assumes every customer is worth the same, which is rarely true. If your customers vary a lot in value, run it separately for each main type.
It assumes a single channel. Run it per channel instead of blending Meta and Google, because blended numbers let a strong channel hide a weak one.
And it ignores time. A customer who pays in month six counts the same as one who pays today, which matters for cash flow even when it doesn’t matter for profit.
Treat the result as the start of a conversation with real numbers. That’s already more than most ad budgets ever get.
Back to the Test
You should be able to answer it now. Write the number down and stick it somewhere you’ll see it before every campaign review.
If the number surprised you, find out where else the money is going. The free 2-minute diagnostic scores your four walls and shows which one is weakest. Ads you can’t prove are paying usually trace back to Measure.
P.S. If you spend ₦1M or more a month on marketing, you also qualify for a free 30-minute Leak Check. Bring your break-even number, and we’ll show you three places the money is slipping out.
This calculator does simple arithmetic on the numbers you enter. The default values are illustrative placeholders, not industry benchmarks or forecasts, and the exchange-rate scenarios are hypothetical. Results are only as accurate as your inputs. This is general business information, not financial advice.
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.
