Cost Per Impression

Cost per impression (CPI), also frequently referred to as cost per mille (CPM), is a metric used in advertising to measure the cost an advertiser incurs each time their ad is displayed to a potential customer.

Here’s a deeper look at CPI/CPM:

• Focus on Displayed Ads: Unlike CPC (cost per click) which focuses on clicks, CPI/CPM centers on impressions, which is simply how many times your ad is shown.
• Cost Efficiency: It provides a way to gauge how efficient your ad campaign is in terms of simply getting your ad seen by a target audience.
• Calculating CPI/CPM: The formula is:
  • CPI/CPM = (Total Advertising Cost / Number of Impressions) x 1000 (for CPM)
  The 1000 conversion factor is used because impressions are often measured in thousands. For example, if you spend $20 on an ad campaign and it receives 5,000 impressions, your CPM would be ($20 / 5,000) x 1000 = $4. This means you pay $4 for every 1,000 times your ad is shown.
• When to Use CPI/CPM vs. CPC: While both metrics are valuable, they serve different purposes. CPI/CPM is ideal for brand awareness campaigns where simply getting your message out is a primary goal. CPC is better suited for campaigns where clicks and driving traffic to your website are crucial.
• Benefits of Tracking CPI/CPM:
  • Reach Analysis: It helps assess how many people are seeing your ads, giving you a sense of the campaign’s reach.
  • Budget Optimization: By comparing CPI/CPM across different placements or demographics, you can identify the most cost-effective ways to reach your target audience.
  • Benchmarking: You can benchmark your CPI/CPM against industry averages to see how your campaign stacks up.
• Limitations of CPI/CPM: It doesn’t necessarily tell you how well your ad is performing in terms of engagement or conversions. Just because people see your ad doesn’t guarantee they’ll remember it or take action.