What is CPM?
Nicklas Segatz Mortensen · Growth Hacker · Fractional CMO · Meta Ads Nerd · 8 July 2026 · 3 min.
Definition
CPM (Cost Per Mille) is the price for 1,000 ad impressions. Spend €6 to reach 1,000 people and your CPM is €6.
Also called: CPM, Cost Per Mille, Cost per thousand impressions
Sådan virker det
CPM (Cost Per Mille) er prisen for 1.000 annoncevisninger. Det er et mål for, hvor dyrt det er at blive set — påvirket af auktionspres, målgruppe og kreativ — men det siger intet om, hvad visningerne er værd. Lav CPM er kun godt, hvis trafikken konverterer.
01What drives CPM
CPM reflects auction pressure: how many other advertisers are bidding on the same audience. That's why CPM rises in peak season (Black Friday, the holidays), in attractive audiences and on premium placements. It's a price for attention, not for results.
A rising CPM isn't necessarily a problem — if conversion rate and AOV keep up, expensive impressions can be perfectly profitable. And a low CPM is worthless if it comes from cheap placements that don't convert.
02CPM in the bigger equation
CPM is the top link in the chain: CPM → CTR → CPC → CVR → CPA. A poor CPM can be rescued by strong creative (high CTR) and a good landing page (high CVR). That's why we rarely optimize CPM in isolation — we look at what the impressions ultimately cost per order.
If you want to lower your real cost, creative is often a stronger lever than chasing cheap impressions: a higher CTR lowers CPC directly, even when CPM is unchanged.
Frequently asked questions
Why is my CPM rising?+
Usually because auction pressure is rising — more advertisers bidding on the same audience, often in peak season. It's rarely a problem in itself, as long as conversion rate and order value keep up, so the impressions stay profitable.
Is a low CPM a goal in itself?+
No. A low CPM from cheap, poorly converting placements is worthless. What counts is the total cost per order (CPA) and the profit behind it — not the price of being seen.
Related terms
Glossary
What is CPC?
CPC (Cost Per Click) is ad spend divided by the number of clicks. Pay €55 for 100 clicks and your CPC is €0.55.
Read the entry →Glossary
What is CTR?
CTR (Click-Through Rate) is the number of clicks divided by the number of impressions, expressed as a percentage. If an ad gets 30 clicks from 1,000 impressions, CTR is 3%.
Read the entry →Glossary
What is CAC?
CAC (Customer Acquisition Cost) is your total sales and marketing costs divided by the number of new customers in the same period. It's the price of winning one customer.
Read the entry →
Nicklas Segatz Mortensen
Growth Hacker · Fractional CMO · Meta Ads Nerd at Oaksmond
Growth hacker and fractional CMO with 10+ years' experience and hundreds of millions in managed ad spend behind him. Background from larger Danish and international scale-ups, and from the agency world.
Meet the team →