CPM
Paid MediaAlso: Cost Per Mille · Cost Per Thousand · Cost Per Thousand Impressions
Quick definition
CPM stands for cost per mille, where mille is Latin for thousand. It is the price you pay for every one thousand times your ad is shown. CPM is the standard pricing model for awareness-focused advertising on platforms like Meta, YouTube and programmatic display networks.
CPM on its own says nothing about whether the campaign is working. Pair it with click-through rate and downstream conversion data before drawing conclusions.
How it varies across Australia
CPM varies sharply across platforms, placements and audience sizes in the Australian market. Video formats on social platforms tend to run higher than static display. Retargeting audiences typically cost more per thousand impressions than cold prospecting audiences. Comparing CPM across campaigns without controlling for format and audience is rarely useful.
See paid media benchmarks across Australian industries →What it actually means
CPM is the currency of reach. When a platform charges you on a CPM basis, you are paying for the opportunity to be seen, not for any action that follows. The platform delivers your ad to an inbox, a feed or a webpage. What happens next is your problem.
This is not a criticism of the model. For brand-building and awareness campaigns, CPM is the right measure. You are trying to get a message in front of a defined group of people, and CPM tells you what that costs per thousand of them.
The mistake is using CPM as a performance metric when you are running a performance campaign. If the goal is sales or leads, CPM tells you almost nothing about whether the campaign is working. A campaign with a low CPM and a low click-through rate and a low conversion rate is not a bargain. It is an efficient way to reach people who are not interested.
The more useful frame for CPM is as a starting input, not a final verdict. CPM multiplied by click-through rate gives you effective cost per click. That multiplied by conversion rate gives you effective CPA. The CPM number only earns its keep when you can see those downstream numbers sitting next to it.
A low CPM on an audience that never buys is the most expensive media you can run.
How to calculate it
CPM = (Total ad spend ÷ Total impressions) × 1,000
Worked example. You spent $800 on a Facebook campaign and the campaign delivered 200,000 impressions. CPM = ($800 ÷ 200,000) × 1,000 = $4.00. Every thousand people who saw the ad cost you four dollars to reach.
The Australian context
Australian CPMs run higher than US equivalents on most platforms, partly because the auction pool is smaller. Fewer advertisers competing for the same inventory in a smaller market means less competitive downward pressure on pricing.
This matters most for Australian brands trying to benchmark against US industry reports. A CPM that looks expensive by US standards may be entirely normal for the Australian market. The comparison to make is against your own historical CPM on the same platform and audience, not against a US figure published in a trend report.
Seasonal CPM spikes in Australia also tend to cluster around different periods than US peaks, most notably around Melbourne Cup, the summer retail window in November and December, and the start of the school year in late January.
Where people get this wrong
Related terms
Common questions
Is a lower CPM always better?
Not necessarily. A lower CPM means cheaper reach, but reach to the wrong audience is worthless. Always look at what the CPM is buying you in terms of clicks, conversions and revenue before deciding whether the cost is good or bad.
Why does CPM go up at certain times of year?
More advertisers enter the auction during peak retail periods, which drives up the clearing price. In Australia, the Christmas shopping window and post-financial-year periods are the most common CPM spikes. Budget accordingly if you plan campaigns around those windows.
What is the difference between CPM and eCPM?
eCPM stands for effective cost per mille. Publishers use it to compare revenue across campaigns with different pricing models. If you are an advertiser, CPM is what you pay. eCPM is the publisher's view of what they earned per thousand impressions served across their inventory.
Should I choose CPM or CPC bidding for my campaign?
For brand awareness and reach, CPM gives you predictable cost per eyeball. For campaigns where a click is the goal, CPC shifts the risk to the platform to deliver traffic. Neither is universally better. Match the bidding model to what you are actually trying to achieve.
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About New Rebellion
New Rebellion is a marketing intelligence consultancy. We build tools, score Australian businesses on how their marketing actually performs, and publish Debrief every day. This dictionary is part of how we work in the open.
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