Four numbers tell you whether your ad budget is working: cost per lead, ROAS (return on ad spend), customer acquisition cost, and what a customer is worth to you. These ad performance metrics tie spending to sales, and each one depends on conversion tracking.
Decide what counts before you count it
A conversion is the action you want someone to take after clicking your ad: sending a form, calling the number on your site, messaging you on WhatsApp, placing an order, or booking an appointment. Your ad account can only report something meaningful once you've told it which of these actions matter.
That list looks different for every business. A furniture store might care most about orders and requests for directions to the showroom. An education consultancy is waiting for consultation requests. Split your list into two tiers: actions that bring in money directly (a sale, an accepted proposal) and actions that move someone closer to one (a form, a call, a message). Counting them as equals inflates the report. A tap on a WhatsApp button and a completed order are different things.
Small snippets of code do the counting. The Google Ads tag and the Meta pixel report actions on your site back to each ad platform. Once they're installed, test them yourself: fill in your own form, call your number from the site, and check that each action appears in the reports. Platforms sometimes show conversions a few hours late, so wait a little before you decide something is broken.
Your ad account only sees what happens on the website. Whether a lead turned into a paying customer shows up only in your own records: a spreadsheet, a notebook, or CRM software. Next to every lead, note where it came from and whether it ended in a sale. Even asking callers "How did you hear about us?" feeds that record. UTM tags help too. These short labels on your ad links tell your analytics which campaign a visit came from, so channels are easier to separate later.
What do impressions and likes tell you?
The top rows of most ad reports are impressions, reach, clicks, and click-through rate. They show that your ad was seen and caught some interest. They say nothing about what ended up in your bank account.
Call them vanity numbers. They feel good as they grow, but on their own they can't carry a decision. A cheap click from the wrong audience is an expensive mistake. A post with thousands of likes may not have produced a single order. Meanwhile, a narrow search campaign with modest impressions could quietly be your most profitable channel.
Business numbers are leads, sales, revenue, and profit. Vanity numbers help you locate a problem: a low click-through rate often means the ad copy or image isn't landing. Decisions, though, belong to business numbers. If your report opens with impressions and never gets to sales, ask for it in the opposite order.
The four ad performance metrics that matter
Every example below is hypothetical. The figures are round on purpose, chosen only to show the math. What counts as a good number in your industry depends on your own prices and margins.
The first is cost per lead: the average ad spend behind each form, call, or message. Divide spend by the number of leads. Suppose a renovation company spends 10,000 TL on Google Ads in a month and gets 40 leads. That works out to 250 TL per lead. On its own, this figure is neither good nor bad. The next three give it meaning.
The second is ROAS: how much revenue each lira of advertising brings back. It's the go-to number for businesses that sell online. Suppose an online furniture and home decor store spends 8,000 TL on Meta Ads. The orders from those ads add up to 32,000 TL. ROAS is 4. That sounds healthy, but ROAS measures revenue, and revenue isn't what you keep. If your gross margin after product cost, shipping, and returns is 30%, those 32,000 TL in sales leave 9,600 TL of gross profit. Subtract the 8,000 TL that went to ads and 1,600 TL remains. To find your own break-even point, divide 1 by your margin: at 30%, it's roughly 3.3. Any ROAS below that line brings in sales and still loses money.
The third is customer acquisition cost: ad spend divided by the number of paying customers it produced. It exposes what cost per lead hides, since not every lead buys. Suppose an education consultancy spends 6,000 TL, receives 30 inquiries, and 3 of them enroll. At 200 TL, the cost per lead looks fine, but winning each student cost 2,000 TL. If leads keep rising while customers stay flat, look beyond the ads too. How quickly inquiries get a reply and what gets said on the phone shape this number as well. For a stricter view, add costs such as creative production and management fees to the spend.
The fourth is what a customer is worth to you: the total profit a customer leaves over the whole time they buy from you, often called customer lifetime value. Suppose clients of a nutrition consultant stay for four months on average, and each month leaves 1,500 TL in profit. Each client is worth 6,000 TL. If winning one costs 1,500 TL, the ads are more than paying for themselves. The same acquisition cost could lose money on a one-off, low-margin sale. That's why this fourth number sets the bar for the other three: it tells you the most you can afford to pay for a customer.
Why do Google Ads and Meta Ads need different yardsticks?
Someone who sees your Google ad is looking for exactly what you offer, right now. A person typing "bathroom renovation contractor" is close to a decision. So even when cost per lead is higher on Google Ads, those leads are often closer to buying.
On Instagram and Facebook, people come across your ad while doing something else. They weren't looking for you yet. The first contact from Meta Ads is often a site visit, a follow, or a sign-up. The purchase may arrive days later, through another route. Judging a Meta campaign only by same-day sales can make it look worse than it is. Retargeting campaigns (ads shown to people who already visited your site) speak to a warm audience. Keep them out of the same comparison as campaigns reaching new people.
Then there's attribution: the rule that decides which ad gets credit for a sale. Say a customer saw your Instagram ad, later searched your name on Google, and bought. Both platforms may claim that sale in their own reports. Add the two reports together and the total can exceed what came in. Use each platform's report to compare campaigns within that platform, and make overall calls from your own sales records. A blended acquisition cost, total ad spend divided by total new customers, isn't thrown off when two platforms count the same sale.
A good ad report answers three questions
A report can stretch to pages of tables. What a business owner needs is three answers: what did we spend, what came in, and what happens next?
What did we spend: total ad spend for the period, broken down by channel and campaign, next to the planned budget. If spending went over plan, the report should say why.
What came in: leads, sales, and revenue, meaning the four numbers for this period alongside the previous one. Impressions and clicks can sit below them as supporting detail.
What happens next: the decision the numbers point to. Which campaign gets more budget, which one stops, and what gets tested next? A report without this part is a table that never tells you what to do.
Read the report with whoever manages your ads. Ask about any term you don't understand, and don't make a decision based on a number nobody can explain to you.
When to raise the budget, and when to stop
Look for three signs before giving a campaign more money. Has acquisition cost stayed under your target for several weeks? Can your team handle more leads? Is the campaign being held back by its budget? If all three answers are yes, it may be time to spend more. Google Ads usually flags that last case with a "Limited by budget" status. Raise spend in steps and check the four numbers after each one. It's normal for cost per lead to creep up a little as the budget grows.
Before pulling a campaign, make sure tracking works. A campaign with broken conversion tracking reports zero even when it's doing its job. If tracking is sound and the campaign has spent several times your target cost per lead without a single lead, stop it or rebuild it. Don't judge a new campaign on its first few days, since platforms usually need a short learning period. On the other hand, saying "let's give it a bit longer" for months drains the budget. Decide how patient you'll be before the campaign starts, and write it down as a spending limit.
Three things to check tomorrow morning
First, confirm your conversion tracking works. Submit a form on your site and call your number. The next day, check that both actions show up in your Google Ads and Meta reports.
Second, put last month's four numbers onto one page. With spend, leads, new customers, and the profit those customers left side by side, the math takes a few minutes.
Third, find the campaign with the highest cost per lead. If clicks are reasonably priced but leads still cost too much, the problem likely starts after the ad, on the landing page where people arrive. That's the first place to look.
Conversion tracking and Meta pixel setup are part of Marka Ortağı's Google Ads and Meta Ads services. We read the numbers with you using the same three questions.
