A paid advertising glossary: ROAS, CPA, CPL, pixel and more, in plain language

In short

The terms you’ll hear from any media agency, in plain language and with an example. The three most important for a business owner: cost per lead or purchase (CPL and CPA), revenue per shekel of advertising (ROAS), and sound measurement based on the pixel and the Conversions API. The rest help explain why the numbers move.

Cost and result metrics

CPL: cost per lead

What each lead cost, that is, each enquiry that left details. Calculation: spend divided by the number of leads. ₪3,000 that brought 50 leads is ₪60 per lead. How much you can pay for a lead.

CPA: cost per action

What each action you set as the goal cost, usually a purchase or a customer. ₪5,000 that brought 25 purchases is ₪200 per purchase.

ROAS: return on ad spend

How much revenue came in for every shekel of advertising. ₪40,000 in revenue on ₪10,000 of advertising is a ROAS of 4. ROAS is before product, shipping and operating costs, so a ROAS of 4 doesn’t mean you made a profit. How to calculate break-even ROAS.

CPM: cost per thousand impressions

What it costs to show the ad 1,000 times. A high CPM means the audience is expensive or there’s a lot of competition, for example before Black Friday.

CPC: cost per click

What each click on the ad costs. On Google this is the metric the auction is based on in most campaigns.

CTR: click-through rate

What percentage of the people who saw the ad clicked on it. 40 clicks out of 2,000 impressions is a CTR of 2%. A low CTR usually suggests the message or image doesn’t appeal to this audience.

Conversion rate

What percentage of visitors to the page took the action, such as leaving details or buying. 15 leads out of 500 visitors is a conversion rate of 3%.

Measurement

Conversion

An action that’s worth money to you and that the platform counts: a lead, a purchase, a call. The campaign learns from conversions, so it’s important they’re real actions and not just a page view.

Pixel

A small piece of code added to your site that reports to Meta or TikTok what happens on it: a product view, an add to cart, a purchase. On Google this role belongs to the Google tag.

Conversions API

A way to send the same data from the business’s system or server, not just from the browser. It fills in what the pixel misses because of ad blockers and privacy settings, and lets you send what happened after the lead too, such as a closed deal.

GA4 and GTM

GA4 (Google Analytics 4) measures all traffic to the site, from every source. GTM (Google Tag Manager) is the tool where you manage all the measurement codes in one place, without touching the site’s code for every change.

Attribution

How you decide which advertising gets credit for a sale. Each platform credits itself, so the total sales they report is usually larger than your actual sales. Why it happens and how to check.

Audiences

Remarketing

Advertising again to people who have already been on the site, watched a video or left details and didn’t buy. It’s usually the cheapest audience to convert.

Lookalike audience

A new audience Meta builds from the traits of an existing audience, for example your customers. The better the source list, the better the lookalike audience.

Interests

Targeting by what people are interested in according to Meta, such as cooking, insurance or real estate. Today the system expands the audience on its own when it finds suitable people outside it.

How campaigns work

Learning phase

The period when Meta’s system is still testing who to show the ads to, and results are less stable. According to Meta, an ad set usually exits it after about 50 optimization events a week. What that means for your budget.

Smart Bidding

On Google, a strategy where the system decides on its own how much to bid in each auction to reach a target, for example cost per action (Target CPA) or return (Target ROAS).

Performance Max

A Google campaign type that runs ads across all of Google’s channels from a single campaign: Search, YouTube, Display, Gmail and Maps. When it works and when it burns budget.

Negative keywords

Words you mark so the ad won’t appear in searches containing them. For example “free” or “jobs” in a business that isn’t hiring. It’s one of the main tools for stopping waste on Google.

Ad fatigue

When the same ad is shown to the same people again and again, response drops and cost rises. That’s why you replace ads before they wear out.

Instant form (Lead Form)

A form that opens inside Facebook or Instagram, without going to a website. It brings lots of leads at low cost, but needs to be built correctly for the leads to be good quality. How to improve lead quality.

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Frequently asked questions

What’s the difference between ROAS and CPA?

ROAS measures how much revenue came in for every shekel of advertising, and suits mainly online stores. CPA measures what each action cost, for example a customer or a purchase, and suits any business.

Which is better, the pixel or the Conversions API?

Both together. The pixel measures in the browser, and the Conversions API sends the same data from the server or CRM and fills in what the pixel misses.

Which metric matters most to a business owner?

The cost per new customer against the profit from each customer. All the other metrics, like CTR and CPM, help explain why that cost goes up or down.

Sources

Pini Smolanski

Founder of SMOLANSKI Media. 14 years in advertising management, 10 of them at Israel’s leading media and advertising agencies.