Glossary
What is Ad density?
Also called: ad-to-content ratio
Ad density is the share of a page's height taken up by ads. On mobile, the Better Ads Standards treat more than 30% as too much.
हिंदी में पढ़ेंAd density measures how much of a page is ads. On mobile it is usually worked out as the combined height of the ads in the main content divided by the height of that content. The Better Ads Standards treat mobile ad density above 30% as an annoying experience, and Chrome can filter all ads on a site that keeps failing.
Density also shapes how buyers see you. In September 2023 four advertising trade groups described made-for-advertising (MFA) sites by a set of traits, and the first was a high ad-to-content ratio, for example about 30% or more of a desktop page. The more traits a site shows, the likelier verification vendors are to flag it, and then buyers stop bidding.
More ads is not the same as more money. Each extra ad adds impressions but can lower viewability and CPM, and heavy pages slow down and lose readers. Revenue per session, not ads per page, shows when another ad starts to cost more than it earns.
Example
A mobile article is 4,000 pixels tall with 4 ads of 250 pixels each: 1,000 ÷ 4,000 = 25% ad density. Adding a fifth ad makes it 1,250 ÷ 4,000 = 31.25%, over the 30% limit.
Why it matters to publishers
Too much density risks Chrome ad filtering and an MFA label, and both cut demand. Keeping it in check protects CPMs and readers.