Why is my CPM so high?
By Dan BartleyUpdated 3 minute read
The short answer
CPM is what you pay for 1,000 impressions, and it rises when more advertisers compete for the same people or when Meta rates your ads as less relevant. Seasonal peaks, narrow targeting, tired creative and restricted placements all push it up. A high CPM only matters if your cost per purchase is too high, so fix relevance before chasing a lower CPM.
How does Meta decide what I pay for impressions?
Through an auction for every impression. Meta picks the ad with the highest total value, which combines your bid, its estimate of how likely the person is to act, and the quality of your ad, so a more relevant ad can win against a higher bid.
Ad quality draws on feedback from people who see or hide the ad, and Meta marks ads down for low-quality traits such as withholding information, sensational language and engagement bait. A clear, honest ad costs less to show than a clickbait one.
To see how Meta rates your ads, add the ad relevance diagnostics columns in Ads Manager: quality, engagement rate and conversion rate, each ranked against ads competing for the same audience. Meta says more relevant ads cost less and see more results, and the rankings appear once an ad has 500 impressions.
What pushes Facebook ad CPM up?
Competition, narrow audiences, tired or low-quality creative, restricted placements and the goal you optimise for. Each leaves a different trace in Ads Manager.
| Cause | What you see | What to do |
|---|---|---|
| Seasonal competition | Costs up across every campaign in the same weeks | Plan budget and creative for the peak; judge on cost per purchase |
| Narrow targeting | High CPM and high frequency on a small audience | Broaden, or use Advantage+ audience |
| Tired creative | Frequency up, click-through rate down, CPM creeping up | New ads that are clearly different |
| Low ad quality | Below-average quality ranking in ad relevance diagnostics | Clearer ads, without clickbait or engagement bait |
| Restricted placements | Only Facebook Feed selected | Advantage+ placements |
| Optimising for purchases | A higher CPM than traffic campaigns | Usually nothing: Meta is buying likely buyers, not clickers |
Read CPM alongside click-through rate, because together they set your cost per click. A higher CPM with a higher click-through rate can still mean each click costs less than before.
When are Meta ads most expensive in Australia and New Zealand?
In the weeks when retailers spend most: Black Friday and Cyber Monday in late November, the run to Christmas and Boxing Day, and in Australia the end-of-financial-year sales in June. If every campaign jumped in the same week, the calendar is the likely cause.
Plan for the peaks rather than fight them. Have new creative ready before they start, and judge the period on cost per purchase and margin, since a sale price changes both.
Is a high CPM always bad?
No. A campaign optimised for purchases often pays more per impression than a traffic campaign, because Meta is buying the people most likely to buy. If cost per purchase is inside your target, a high CPM is the price of good buyers.
The reverse also holds: a low CPM on a campaign that sells nothing is money spent reaching the wrong people. Treat CPM as a diagnostic and cost per purchase as the goal.
How do I bring my CPM down?
Give the auction more relevant ads and more room to find people: new creative, broad targeting and Advantage+ placements.
- Add new, distinct ads, starting where frequency is highest
- Check ad relevance diagnostics for below-average quality rankings
- Broaden targeting and let Advantage+ audience look for buyers
- Turn on Advantage+ placements rather than Feed only
- Stop editing live ad sets every few days, which keeps them learning
Other questions people ask about this
Does a bigger budget lower CPM?
Not directly. A bigger budget buys more impressions at whatever the auction charges, and as it scales it often reaches more expensive impressions.
What is a good CPM for Facebook ads in Australia?
There is no useful single number, because CPM varies by category, season, audience and goal. Track your own CPM over time and judge it against cost per purchase, the figure that decides profit.
Why did my CPM jump overnight?
Usually a change in competition or in your account: a new audience, a new goal, an edit that restarted learning, or the start of a sale season. Check the change history and the calendar before the creative.
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