千次印象费用（Cost Per Mille，或者Cost Per Thousand Impressions，缩写为CPM），以广告每显示1000次作为单位收取广告费用。是西方一些网络广告应用比较成熟的国家所采用的最常规的收费模式之一。

以电视广告而言，家内电视广告1档约7.5万；收视率1%能让5万户（7.5万人）看到（根据国家通信传播委员会统计，总家户数为820万户；2013年收视户为500万户；普及率约6成），而台湾观众看到广告时就转台的比例达八成，看到广告仅1.5万人。

Cost per mille (CPM), also called cost ‰ and cost per thousand (CPT) (in Latin mille means thousand), is a commonly used measurement in advertising. Radio, television, newspaper, magazine, out-of-home advertising, and online advertising can be purchased on the basis of showing the ad to one thousand viewers. It is used in marketing as a benchmarking metric to calculate the relative cost of an advertising campaign or an ad message in a given medium.