What is Cost Per Thousand Impressions (CPM)?

High CPM typically results from intense competition in your target audience, poor ad quality or relevance, narrow audience targeting, premium placements, or timing factors. Competitive industries like finance, insurance, and legal see CPMs of $20-50+ compared to $2-5 for less competitive niches. Targeting affluent demographics, specific geographic areas, or narrow interest segments increases CPM due to limited inventory. Running campaigns during peak seasons (Q4 holidays, back-to-school) drives up costs. Poor creative that receives low engagement signals low quality to platforms, resulting in higher costs for the same impressions. Platform choice matters too—LinkedIn CPMs are typically 3-5x higher than Facebook due to B2B professional targeting.

Reduce CPM by expanding audience size to access more inventory and reduce competition, improving ad quality to earn better placement rates, testing different ad formats (video often costs more than static images), and adjusting targeting parameters like age ranges or interest categories. Use automatic placements initially to let algorithms find the cheapest inventory, then optimize based on performance. Schedule ads during off-peak hours when competition is lower. A/B test creative frequently—better engagement signals higher quality, earning lower CPMs. Exclude underperforming placements and websites. Consider lookalike audiences which often have lower CPM than interest-based targeting. Use frequency capping to avoid overpaying for repeated impressions to the same users. On Facebook, broader targeting (remove detailed targeting) often yields lower CPMs than narrow audiences.