The cost per thousand (CPM), also known as cost per mille (CPM) or cost per thousand impressions (CPM), is a marketing metric that indicates how much it costs to reach 1,000 people with an advertising campaign.

It is calculated by dividing the total cost of a campaign by the number of contacts reached (views or impressions) and then multiplying the result by 1,000.

In influencer marketing, CPM is used to evaluate the efficiency and cost of collaborations. It helps brands compare different influencers or campaigns and assess how expensive the reach is.

For influencers, CPM is an important basis for pricing, as it shows the value of their reach to advertisers. Depending on the platform, target audience, and content quality, CPM can vary significantly.