Cost/Post Eng.(Inline)
What one engagement on the ad unit itself cost you.
What it means
Cost/Post Eng.(Inline) is SpendSpendWatch it to control budget and back the winners. divided by inline post engagements — the actions people took directly on the ad unit itself — shown in your currency, per engagement. It's a price for attention, not for sales: nothing about an order, a visit or a basket is inside it. It sits beside Cost/Post Eng. in the same table, which divides the same money by a different count of actions.
Show the math
Formula and a worked example
Cost/Post Eng.(Inline) = Spend ÷ inline post engagements. Every cost column on the row shares that numerator. Only the denominator changes.
Inline means on the unit. The engagements counted here are the ones people took directly with the ad as it was served to them, which is a narrower set than Meta's wider post engagement count.
Worked example. An ad spends €900. Meta counts 9,000 post engagements against it and 6,000 inline post engagements. Cost/Post Eng. = 900 ÷ 9,000 = €0.10. Cost/Post Eng.(Inline) = 900 ÷ 6,000 = €0.15. Same money, two prices, because the two columns count different actions.
The gap between them is arithmetic, not performance: the wider it opens, the smaller the share of counted engagement that happened on the unit itself.
It answers the question
What did it cost to get one person to do something on the ad itself? A rising figure means the same budget bought fewer of those actions — before any question of whether the actions were worth having.
Why it matters
It prices attention at the level you can actually change. Budgets and bids move delivery; the image, the first line and the offer move whether anyone touches the unit, and this is the column that shows the difference between two creatives on equal terms.
Each row divides its own Spend, so the column ranks ads by how much engagement every euro bought, whatever the size of their budgets. A €200 test and a €20,000 winner are comparable here in a way they aren't in any total.
What good looks like
There's no published band for this one and no fair one to publish — an engagement costs a different amount in every market, audience and currency. Two readings work. Against your own history: take the figure for an ad you know performed and treat that as the house rate. And against the column beside it: the size of the gap to Cost/Post Eng. tells you how much of your engagement Meta counted as happening on the unit.
How to improve it
| Lever | What you do | Expect | How long | Watch out for |
|---|---|---|---|---|
| Fast Retire the most expensive rows | Pause the ads whose inline cost sits well above the rest of the table at meaningful spend | The campaign's blended figure falls | 3–7 days | You improved the average by removing rows, not by making anything better. If those ads were also producing sales, engagement gets cheaper while the campaign gets worse. |
| Fast Put the hook back in the first frame | Recut the opening so more people stop before the unit scrolls past | More engagements on the same Spend | 1–2 weeks | An opening that stops everyone pulls in people who were never going to buy, so this figure improves while ROAS on the same ad stays where it was. |
| Fast Give the unit something to do | Ask a question in the copy, or use a format that rewards a tap on the ad rather than a tap away from it | More on-unit actions per euro | 2 weeks | On-unit engagement competes with the tap that leaves for your site. Cheaper engagement here can arrive with fewer sessions. |
| Slow Narrow the audience to people who care | Tighten targeting to the interests and customer lists that already respond to this subject | A higher share of the people reached engage | 3–6 weeks | A smaller pool costs more to reach and repeats itself sooner, so Frequency climbs alongside the saving. |
Every lever costs something somewhere. The last column is the one to read twice.
Read it with
The price of an engagement means little on its own. Next to the money behind it, it tells you whether a creative is holding up as you scale it.
Scaling without paying up
You put more money behind the ad and attention got cheaper. Uncommon, and usually a creative that found the right audience rather than a bidding win.
Paying up for delivery
More spend is buying engagement at a worse price. Normal while scaling — a decision to make, not yet a fault to fix.
Trimmed back
Less money and cheaper attention, which usually means the weaker ads came off. Check the engagement counts held up, not only the price.
The one to act on
You are spending less and each engagement costs more, so something outside the budget changed. Wear-out and a shrinking audience both land here.
Both divide the same Spend, so any difference between them is a difference in what got counted, never in what got charged. Read them as a pair: when only the inline figure moves, the change is in how people used the ad unit itself, which is a creative signal. When both move together, it's delivery or price, and the creative is not the story.
On video rows these two split the funnel in half. A strong Thumbstop with an expensive inline cost means people stopped and then did nothing — the opening works and the rest of the ad doesn't. A weak Thumbstop with a cheap inline cost means the few who stayed were the right people, and the opening is what's limiting the ad.
Common misreads
It's up because the same Spend bought fewer inline engagements. That can happen while sales hold steady or improve — this column has no view of orders at all.
Nothing about an order is in this number. An ad can buy the cheapest attention in the table and send almost nobody to your site.
The two divide identical spend by different counts, so they can move apart for reasons that have nothing to do with budget or bidding.
Also called
Cost per inline post engagement · inline engagement cost
See yoursYour inline engagement cost per ad, beside the wider Cost/Post Eng. it should always be read against.
Open Meta →