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Cost Per Mile (CPM)
George Jameson avatar
Written by George Jameson
Updated over a year ago

What Is Cost Per Mile (CPM)?

CPM stands for “Cost Per Mille” or “Cost Per Thousand.” It’s a common advertising metric used in digital marketing to measure the cost of displaying an ad to 1,000 people or impressions. In essence, it tells advertisers how much they pay for a thousand ad views.

Example of CPM:

Let’s say you run an online fashion brand and decide to advertise on a fashion website. You agree to pay £10 CPM for your banner ad. If your ad is shown to 10,000 visitors on that website, you would pay £100 (10,000 divided by 1,000 times £10) for those impressions.

Why Tracking CPM Is Important:

Tracking CPM is important for several reasons:

  • Budget Management: It helps advertisers manage their advertising budget effectively by understanding the cost of reaching a specific audience.

  • Performance Evaluation: Advertisers can compare CPMs across different campaigns and platforms to assess which ones offer the best value for their money.

  • ROI Analysis: CPM is a critical factor in calculating the return on investment (ROI) for advertising campaigns.

Using CPM for Data-Driven Decisions:

For brands looking to stay competitive and adapt to market trends, here’s how to use CPM effectively:

  • Campaign Comparison: Compare CPMs across various advertising channels and campaigns. Lower CPMs can indicate more cost-effective advertising opportunities.

  • Audience Targeting: Analyse CPMs for specific audience segments. This can help you identify which audience groups are more cost-effective to reach.

  • Ad Creative Optimisation: Test different ad creatives and formats to see which ones result in lower CPMs while maintaining or improving ad performance.

  • Geographic Insights: Analyse CPM variations in different regions. It can reveal geographic areas where advertising costs are more favourable.

  • Seasonal Trends: Monitor CPM changes over time, considering seasonal fluctuations and industry-specific trends.

  • Competitor Benchmarking: Research competitors’ CPMs to gain insights into industry standards and potentially identify areas for cost savings.


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