What Is CPM? Cost Per Thousand Impressions

In plain English

You pay for the ad being shown rather than for anyone acting on it. The M is from mille, meaning thousand.

It suits awareness objectives, where being seen is the point, and it suits publishers who cannot guarantee response. For a small advertiser looking for enquiries it usually transfers the risk the wrong way.

What to know

Priced per thousand displays

Regardless of response.

Suits awareness

Where exposure is the objective.

Risk sits with the advertiser

You pay whether or not anyone acts.

Varies by placement

Premium inventory costs considerably more.

Why it matters

Comparing CPM between channels tells you almost nothing, because a thousand impressions in a feed and a thousand on a connected television are not comparable exposures.

Common mistakes

×Buying on CPM when the objective was enquiries.

×Comparing CPM across incomparable placements.

×Ignoring viewability, so paid impressions were never seen.

×Treating low CPM as efficiency.

FAQs

When is CPM the right model?

For awareness, and where the placement quality is known and verified.

Is a low CPM good?

Only if the impressions were genuinely seen by the right people.

WRITTEN BY TARIQ SALLAM

Marketing Consultant. Entrepreneur. Content Creator.

I'm a marketing consultant, entrepreneur and content creator. I help businesses grow through practical marketing, websites, SEO, content and AI.

More About Tariq →