CPM

CPM (Cost Per Mille, from the Latin "mille" meaning thousand) is the price you pay for 1,000 ad impressions. It is the standard pricing model for display advertising, video advertising, and awareness-focused social media campaigns. If you pay a $10 CPM and your ad receives 500,000 impressions, your total cost is $5,000.

Why it matters: CPM is the primary metric for brand awareness campaigns where the goal is visibility rather than immediate clicks or conversions. It determines how efficiently you can put your message in front of your target audience. Lower CPMs mean more eyeballs for the same budget. CPM also serves as a useful comparison metric across channels and placements to evaluate where your awareness dollars go furthest.

How CPM is determined: on programmatic and social advertising platforms, CPM is set through real-time auctions. Factors that influence CPM include: audience targeting specificity (narrow, high-value audiences cost more), ad format (video typically has higher CPMs than static images), placement (Instagram Stories vs. Facebook News Feed vs. Audience Network), time of year (Q4 CPMs spike due to holiday advertising demand), and competition for your target audience.

CPM benchmarks: Facebook/Instagram average $5-15 CPM for most audiences. LinkedIn ranges from $10-35 CPM (higher due to B2B targeting). Programmatic display averages $2-10 CPM. YouTube averages $5-20 CPM for in-stream ads. Connected TV (CTV) ranges from $20-40 CPM. These vary significantly by targeting, creative quality, and seasonal demand.

When to use CPM bidding vs. CPC bidding: use CPM when your goal is awareness and reach (you want maximum exposure). Use CPC when your goal is traffic (you only want to pay for engaged users). Use CPA bidding when your goal is conversions (you want the algorithm to optimize for people likely to convert). Many advanced advertisers start with CPC or CPA bidding and monitor CPM as a diagnostic metric to understand market dynamics.

Common mistakes: optimizing for low CPM without considering audience quality. A $3 CPM reaching irrelevant users is worse than a $15 CPM reaching your exact ICP. Comparing CPMs across different ad formats (video CPMs are naturally higher than static image CPMs). Not accounting for viewability: a $5 CPM where only 30% of impressions are actually viewed by a human is effectively a $16.67 viewed CPM.

Practical example: a SaaS company runs awareness campaigns on LinkedIn ($28 CPM) and Facebook ($8 CPM). The LinkedIn CPM is 3.5x higher, but LinkedIn reaches their exact ICP (VP-level at B2B SaaS companies) while Facebook reaches a broader audience. They track downstream pipeline and find that LinkedIn-exposed prospects convert to demo at 8x the rate of Facebook-exposed prospects. The effective cost per qualified prospect is actually lower on LinkedIn despite the higher CPM.