CCost Per Mille (CPM)

Cost Per Mille, or CPM, is a standard advertising metric that charges you based on the number of times your ad is displayed, regardless of whether users interact with it. The term "mille" comes from the Latin word for thousand, so CPM literally means the cost per 1,000 impressions. This model is straightforward: if your CPM is £5 and your ad receives 100,000 impressions, you'll pay £500 total.

CPM matters because it shifts the focus from immediate conversions to brand exposure and reach. Unlike performance-based models such as Cost Per Click (CPC) or Cost Per Acquisition (CPA), CPM rewards volume and visibility. This makes it ideal for awareness campaigns where your primary goal is to get in front of as many potential customers as possible. Businesses launching new products, building brand recognition, or targeting specific demographics often prefer CPM because it allows predictable budgeting and broad market penetration.

How CPM works in practice depends on your advertising channel. Display networks, social media platforms, and programmatic ad exchanges all use CPM pricing. When you set a CPM bid, you're competing against other advertisers for ad placements. Higher bids typically secure better placements or more premium inventory. The actual CPM you pay may vary based on audience quality, placement location, time of year, and market demand.

Understanding CPM helps you evaluate whether your ad spending is efficient relative to your goals. A low CPM sounds attractive, but it only matters if the impressions reach your target audience. Conversely, a higher CPM in premium placements might deliver better-qualified traffic. Comparing CPM across channels and campaigns reveals where your budget is generating the most valuable exposure.