Cost per Mille

Cost per Mille (CPM) is an advertising metric that represents the cost of 1,000 advertisement impressions.

Cost per Mille (CPM), also known as cost per thousand impressions, is a commonly used measurement in advertising. It refers to the cost an advertiser would pay for a thousand potential customers to view their advertisement. Unlike Cost per Click (CPC), where advertisers pay for every click made on their advertisements, CPM is purely based on impressions. This advertising model is particularly used for brand awareness campaigns, where the primary goal is to reach a broad audience irrespective of click-through rates.


The formula to calculate the CPM will be: CPM = (Total Ad Spend / Total Ad Impressions) x 1000


Let's say a business spent $100 on a campaign and this campaign produced 20,000 impressions. Then, the CPM would be

($100 / 20,000) x 1000 = $5.

Why is CPM important?

CPM is a critical metric that allows brands to measure the cost-effectiveness of their marketing campaigns. It offers insights into how much the brand needs to shell out to reach a thousand potential customers. It provides a straightforward way to compare the cost of different marketing channels and campaigns, aiding marketers to allocate their budgets more effectively.

Which factors impact CPM?

  1. Targeting: Strategically define your audience segment based on demographics, interests, and behavior to streamline the ad reach.
  2. Ad Quality: High-quality and relevant ads can significantly improve engagement rates, subsequently lowering CPM.
  3. Bid Strategy: Adopt a bid strategy that aligns with your campaign goals. For instance, auto-bid or CPM bid allows algorithms to adjust bids to deliver ads efficiently.

How can CPM be improved?

Several factors can influence CPM, including target audience, competition, ad quality, and placement. For example, highly competitive audiences or timeslots could raise CPM as more advertisers vie for the same space.

What is CPM's relationship with other metrics?

CPM is often evaluated alongside other metrics like Click-through Rate (CTR), Conversion Rate (CR), and Return on Ad Spend (ROAS). While CPM accounts for the cost-effectiveness of reaching potential customers, CTR provides insights into the effectiveness of driving users to interact with the ad. Meanwhile, CR and ROAS connect ad impressions to tangible outcomes, like purchases.

Request Demo