Quality Score explained: the metric that determines your cost per click

Part 1 introduced Quality Score as one half of the Ad Rank formula. This part opens it up directly — the three specific components Google evaluates, visible in the account itself, and why improving it is often the highest-leverage thing to do in an underperforming campaign.

The three components, visible per keyword

Keyword: "coffee subscription"
Quality Score: 7/10

  Expected CTR:        Above average
  Ad relevance:         Average
  Landing page experience: Above average

Google Ads shows this exact breakdown per keyword, under the keyword's status column — each component rated Below average, Average, or Above average, alongside the overall 1-10 score. This breakdown is the actual diagnostic tool: a low overall score with "Ad relevance: Below average" points directly at the ad copy needing work, while "Landing page experience: Below average" points at the destination page instead — two completely different fixes for the same low score.

Expected CTR: is this ad likely to get clicked, for this keyword

Google's own historical data on how ads for a given keyword typically perform, adjusted for this specific ad's own track record once it has one. This is closest to a direct measure of part 6's ad copy quality — genuinely compelling, specific ad copy directly improves this component over time as real click data accumulates.

Ad relevance: does the ad actually match the keyword

A keyword like "coffee subscription gift" showing an ad that never mentions gifting at all is a direct relevance mismatch, even if the ad is otherwise well-written — this is exactly why part 2 split Bright Leaf Coffee's account into separate "General" and "Gift" ad groups: an ad group whose keywords and ad copy are tightly, specifically aligned scores meaningfully better here than one ad trying to loosely cover several different intents at once.

Landing page experience: does the destination page deliver

Google evaluates the landing page's relevance to the keyword, its usability, and its trustworthiness — this is the direct connection to part 8's landing page guidance: a dedicated, message-matched, fast-loading page scores better here than a generic homepage the ad's specific promise doesn't actually follow through on.

Why a one-point improvement genuinely matters

Quality Score 4/10:  higher cost per click for the same Ad Rank position
Quality Score 8/10:  meaningfully lower cost per click for the same position

Because Ad Rank is bid times Quality Score (part 1), two advertisers can occupy the same ad position while paying very different actual costs per click — the one with the higher Quality Score is, in effect, being charged less by Google for the same result, since less bid is needed to reach the same Ad Rank. This is real, direct money, not just an abstract quality metric — improving Quality Score by even one or two points on a high-volume keyword can measurably lower overall campaign cost.

Where to actually look when Quality Score is low

1. Check which of the three components is rated "Below average"
2. Below average ad relevance  → rewrite ad copy to match the keyword's specific intent (part 6)
3. Below average landing page  → build a dedicated, message-matched page (part 8)
4. Below average expected CTR  → often resolves itself once relevance and copy improve

Chasing a higher Quality Score directly, as an abstract number, is less useful than fixing whichever specific component is actually weak — the score itself is a downstream result of the real, fixable inputs above it, not a lever to pull on its own.

Next: bidding strategies — how much to actually bid, and when to hand that decision over to Google's own automated bidding instead of setting it manually.