CPM Calculator

Calculate cost per thousand impressions

CPM, cost per mille, is the cost of a thousand ad impressions, and it is a standard measure for comparing ad buys. This calculator computes CPM from your spend and impressions, so you can compare the cost of reaching audiences.

Why CPM matters for ad buying

Advertising is often priced and compared per thousand impressions, because raw cost depends on scale and CPM normalises it: a campaign costing more in total may be cheaper per impression, and therefore better value for reach. Computing CPM from spend and impressions lets you compare campaigns and channels on a like-for-like basis. It is the reach metric, telling you what awareness costs, and it pairs with click and conversion metrics to give the full picture of an ad spend’s efficiency.

A planning estimate

This is an estimate for planning from the figures you enter, not financial or business advice. Real outcomes depend on factors beyond any single calculation, so treat the result as a guide. The calculation runs entirely in your browser, so your figures are never uploaded and stay on your own machine, which matters for business numbers you would not want to share.

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