Quality Score — the diagnostic you audit, not the number you bid for

Quality Score is a 1-10 diagnostic that tells you how your ad quality compares to other advertisers — it is not a number you bid on or optimize directly. Treating it as a KPI to chase (rather than a warning light to read) wastes budget: the real levers are its three components, and those act on How the Google Ads Auction Actually Works — the pricing engine behind every bid decision you'll make in real time, not through the Quality Score number itself.

Definition: a diagnostic 1-10 rating, not an auction input

Quality Score is "a diagnostic tool meant to give you a sense of how well your ad quality compares to other advertisers," on a 1-10 scale — FONTE: https://support.google.com/google-ads/answer/6167118. Google is explicit that "Quality Score is not an input in the ad auction" and therefore does not directly determine Ad Rank or CPC — FONTE: same source. Google also compares it to "a warning light for a car's engine that shows how healthy your ads and keywords are" — FONTE: https://support.google.com/google-ads/answer/6167123. Consequently Quality Score is explicitly *not* a KPI and should not be optimized or aggregated as a success metric — FONTE: https://support.google.com/google-ads/answer/6167123 ("a helpful diagnostic tool, not a key performance indicator").

What does not affect it

bidding amounts, account structure, ad frequency, and reported conversions do not impact Quality Score — FONTE: https://support.google.com/google-ads/answer/156066. The user's device (mobile, tablet, desktop) is, however, factored into the evaluation — FONTE: https://support.google.com/google-ads/answer/6167132.

The three components and how each is graded

Quality Score is calculated from three components — FONTE: https://support.google.com/google-ads/answer/6167118:

- Expected CTR: "the likelihood that your ad will be clicked when shown" for a given keyword. - Ad Relevance: "how closely your ad matches the intent behind a user's search." - Landing Page Experience: "how relevant and useful your landing page is to people who click your ad."

Each component is graded on a 90-day rolling comparison — "performance comparisons over the last 90 days" — against other advertisers whose ads showed for the *exact same search term* in that window, not against the keyword's own history — FONTE: https://support.google.com/google-ads/answer/6167118.

How Quality Score influences Ad Rank and CPC indirectly

Quality Score itself is not used in the auction, but the real-time, auction-time evaluations of its three underlying factors (expected CTR, ad relevance, landing page experience) feed directly into the Ad Rank formula — FONTE: https://support.google.com/google-ads/answer/1722122. Ad Rank is calculated from bid amount, this auction-time ad quality, Ad Rank thresholds, auction competitiveness, search context, and expected impact of assets — FONTE: same source. Full mechanics of that formula and what you actually pay are in How the Google Ads Auction Actually Works — the pricing engine behind every bid decision you'll make.

Practical consequence for spend: higher-quality ads "cost less per click than lower quality ads" because quality factors raise Ad Rank, which sets both placement and price — FONTE: https://support.google.com/google-ads/answer/6297. What actually decides how close CPC gets to the max bid is competitive pressure, not quality alone: "you're often charged less — sometimes much less — than your maximum cost-per-click (max. CPC) bid," and when there is no competitor immediately below you (none has cleared the Ad Rank thresholds), "you only pay the reserve price," regardless of how high the max bid is set — FONTE: https://support.google.com/google-ads/answer/6297. An advertiser never pays more than the minimum required to clear the Ad Rank thresholds and beat the competitor immediately below — FONTE: https://support.google.com/google-ads/answer/6297. These auction-time component evaluations are dynamic, recalculated per auction, not read off a static pre-calculated number — FONTE: https://support.google.com/google-ads/answer/1722122.

Where to find it and how to read component status

Quality Score and its component statuses live in the Keywords section of Google Ads — FONTE: https://support.google.com/google-ads/answer/6167118. To display the columns: Campaigns > Search Keywords > columns icon (upper right) > "Modify columns for keywords" — FONTE: same source. Each component shows one of three statuses: Above average, Average, or Below average, computed against other advertisers who showed for the exact same search — FONTE: https://support.google.com/google-ads/answer/6167118. "Below average" or "Average" flags an improvement opportunity for that specific component — FONTE: same source.

Fixes per component — FONTE: https://support.google.com/google-ads/answer/6167130: - Expected CTR: make ads more compelling, highlight unique benefits, use strong calls-to-action ("Buy, Sell, Order, Browse, Find, Sign up, Try, Get a Quote"). - Ad Relevance: match ad copy language directly to the search terms; organize keywords into tightly themed ad groups so messaging lines up with intent (see How to Structure a Search Campaign (Ad Groups, RSAs, Settings) — the foundation an audit checks and a budget plan assumes is sound). - Landing Page Experience: keep the landing page consistent with the ad's message, optimize for mobile, and improve page load speed.

Myths worth killing before an audit

- "Quality Score 10 guarantees position 1." False: a higher position does not raise the Expected CTR rating, because expected CTR is normalized for actual ad position — FONTE: https://support.google.com/google-ads/answer/6167132. - "You can buy Quality Score." False: since Quality Score is not an auction input, you cannot purchase it through bidding, and you don't need premium positions to earn a high score — FONTE: same source ("You don't need to bid for higher positions to increase Quality Score"). - "Account structure or naming conventions move Quality Score." False if the structure doesn't itself change user experience — FONTE: same source. - "Running on the Display Network or search partners hurts Search Quality Score." False: Display participation has no effect on Search Quality Score — FONTE: same source. - "Quality Score is what decides the auction." Not quite: the three underlying components are used in the auction in real time; the 1-10 diagnostic number itself is not — FONTE: https://support.google.com/google-ads/answer/6167123.

Why this matters for the wiki's objective

An account audit that reports "Quality Score is low, raise it" without naming the failing component (Expected CTR vs Ad Relevance vs Landing Page Experience) gives the advertiser nothing actionable — and worse, chasing the number directly (e.g. paying for premium position, restructuring the account for its own sake) burns budget on levers Google states don't move it. The correct audit move is to open the Keywords columns, read the per-component status, and apply the matching fix above; see How to Audit an Existing Google Ads Account (Priority Order) — the sequence that stops you from trusting broken data for where this check sits in the audit order.

Related

- How the Google Ads Auction Actually Works — the pricing engine behind every bid decision you'll make — the Ad Rank formula that actually consumes Quality Score's three components at auction time; read this to understand *why* fixing Expected CTR or Landing Page Experience lowers CPC even though Quality Score itself is never bid on. - How to Audit an Existing Google Ads Account (Priority Order) — the sequence that stops you from trusting broken data — where checking Quality Score component status fits in a priority-ordered account audit, after conversion tracking is confirmed accurate. - How to Structure a Search Campaign (Ad Groups, RSAs, Settings) — the foundation an audit checks and a budget plan assumes is sound — tightly themed ad groups are the concrete lever for improving the Ad Relevance component.