Quality Score

Quality Score is Google's shorthand for "how good is this ad for this search?" Each keyword gets a score from 1 to 10, built from three components: expected click-through rate, ad relevance to the search, and landing page experience. Microsoft Advertising uses a similar concept.

Google describes Quality Score as a diagnostic tool rather than a direct input to the auction, but the underlying quality signals do feed Ad Rank, which decides ad position and price. In practice, advertisers with better quality signals can win higher positions and pay less per click than competitors with higher bids but weaker ads.

Improving Quality Score usually means tighter keyword groups, ad copy that matches search intent, and fast, relevant landing pages. A common confusion: Quality Score is not a measure of campaign success or ROAS; a keyword can score 9 and still be unprofitable.

Think of it like this

Quality Score is like a restaurant hygiene rating on the door: it does not guarantee a great meal, but a good score helps you get customers more cheaply.

An example

Two advertisers bid on "yoga mats". One bids US$2.00 with Quality Score 8; the other bids US$2.80 with Quality Score 4. The first can win the higher position at a lower CPC.