Lexicon entryPaid search · Measurement

Quality Score QS

Q: Does Quality Score affect cost per click?

Yes, directly. Quality Score is a multiplier in Google's Ad Rank formula. Your actual cost per click is determined by the Ad Rank of the competitor immediately below you divided by your Quality Score. At the same bid, a keyword with Quality Score 8 pays roughly 50% less per click than a keyword with Quality Score 4.

Q: Is Quality Score the same on Meta and Microsoft Ads?

No. Meta uses its own quality and engagement rankings delivered at the ad level rather than the keyword level; the mechanism is structurally similar (reward relevance, penalise poor creative) but the inputs differ. Microsoft Ads uses its own Quality Score that mirrors Google's closely. The underlying principle — platforms reduce costs for ads that produce a better user experience — is consistent across paid search and paid social.

The 1–10 diagnostic rating Google Ads assigns to every keyword. It sets what you actually pay per click — and it is the single largest lever for reducing cost per lead without reducing volume.

Chris Gardner — Digital Marketing Consultant, USA TODAY NETWORK | LOCALiQ. Founder, Signostic. Windsor, ON. Last updated 20 April 2026 · About · LinkedIn · Email

Direct answer

Quality Score is Google Ads’ 1–10 rating of the relevance between your keyword, ad copy, and landing page. It sets your actual cost per click at auction: a Quality Score of 10 can pay up to 50% less per click than a Quality Score of 5, at the same bid.

What it is

A diagnostic signal from Google, not a bidding input.

Quality Score is Google’s way of telling you how well your account fundamentals are working. It is not a lever you adjust directly. It is the scoreboard.

The score is assigned at the keyword level and drawn from three components: expected click-through rate (based on the historical performance of the keyword), ad relevance (how closely your ad copy matches the search query), and landing page experience (page speed, content relevance, mobile usability, and trust signals). Each component is rated below average, average, or above average, and the combined signal produces the 1–10 score visible in the Google Ads keyword report.

A keyword with a low Quality Score is a keyword you are paying a premium to run. A keyword with a high Quality Score is a keyword Google is effectively subsidising, because you are producing the kind of ad experience Google wants to serve. That asymmetry — the same bid producing radically different actual costs — is the entire commercial point of the mechanism.

How it’s calculated

The auction mechanics, stated simply.

Google’s Ad Rank formula determines both who wins a given auction and what they pay. Quality Score enters the calculation as a multiplier on your bid, and the result is that a higher Quality Score produces a lower actual CPC at the same bid.

The core formulas

Ad Rank = Max CPC Bid × Quality Score + (expected impact of extensions) Actual CPC = (Ad Rank of competitor below ÷ your Quality Score) + $0.01

Worked example — two advertisers bidding $5.00 on the same insurance keyword:

· Account A (Quality Score 3) — pays roughly $6.25 per click (~25% above competitor benchmark)

· Account B (Quality Score 8) — pays roughly $3.15 per click (~37% discount versus benchmark)

Same bid. Same keyword. Account B pays less than half of what Account A pays — and on a higher impression share, because Ad Rank is also higher.

Why it matters · SMB operator view

The compounding effect on cost per lead.

Quality Score is not an academic metric. It is the single largest lever for reducing cost per lead without reducing volume — because it compresses CPC without removing impressions from the auction.

Insurance. Category CPCs routinely exceed $50 on competitive keywords like auto insurance quote or commercial general liability. A Quality Score of 4 versus 8 can mean the difference between a $120 cost per lead and a $55 cost per lead on the same budget. For an insurance broker running $25,000 per month, that shift is worth roughly 230 additional leads a month — with zero increase in spend.

Retail. CPCs are lower in absolute terms but volumes are higher, so Quality Score drift compounds across thousands of keywords. A retail advertiser running $40,000 per month in Google Shopping and Search sees a two-point Quality Score lift across their top 200 keywords produce roughly a 20–30% CPC reduction blended — and because retail conversion rates are seasonal-sensitive, the resulting improvement in cost per sale stacks with every promotional window.

In both verticals, the mechanism is identical: Quality Score is the only PPC lever that reduces your cost per click without reducing your volume. Every other cost-reduction tactic — lowering bids, cutting match types, pausing campaigns — gives up impressions to save money. Quality Score gives you impressions at a lower unit price.

Common misunderstandings

Four things operators get wrong.

Myth

Higher bids buy higher ad rank.

Fact

Ad Rank is bid multiplied by Quality Score. A $10 bid at Quality Score 3 produces the same Ad Rank as a $3.75 bid at Quality Score 8 — and the higher-QS advertiser pays less for every click it wins.

Myth

Quality Score is set-and-forget.

Fact

Quality Score decays. Keywords that launched at 7 or 8 drift to 4 or 5 over months of landing-page changes, ad rotations, and search-term drift. Quarterly audits are the minimum; monthly is better in accounts spending above $10,000 per month.

Myth

Landing page speed is a Quality Score factor on its own.

Fact

Page speed influences Landing Page Experience, which is one of the three Quality Score components — but mobile usability, message match to the ad, content relevance, and trust signals all feed the same component. Fixing speed alone rarely moves Landing Page Experience from below average to above average.

Myth

Quality Score affects all auction types equally.

Fact

Google does not publish the exact weighting, and Quality Score applies primarily to Search campaigns. Performance Max and Shopping use their own relevance signals; Display and YouTube use engagement-driven quality signals. The principle transfers — better relevance, lower costs — but the mechanism is campaign-type-specific.

Frequently asked

Quality Score, answered.

What is a good Quality Score in Google Ads?

A Quality Score of 7 or above is the threshold for meaningful CPC discounts; 8–10 produces the largest cost reductions. Below 5 means you are paying a premium versus competitors running stronger ad relevance and landing pages. The actionable benchmark is to focus audit time on keywords scoring 5 or below, since that is where the largest compounding gains live.

How is Quality Score calculated?

Google Ads calculates Quality Score from three components: expected click-through rate (based on historical performance of the keyword), ad relevance (how closely your ad copy matches the search query), and landing page experience (page speed, content relevance, mobile usability, and trust signals). Each component is rated below average, average, or above average, and the combined signal produces the 1–10 score.

Does Quality Score affect cost per click?

Yes — directly. Quality Score is a multiplier in Google’s Ad Rank formula. Your actual cost per click is determined by the Ad Rank of the competitor immediately below you divided by your Quality Score. At the same bid, a keyword with Quality Score 8 pays roughly 50% less per click than a keyword with Quality Score 4.

How quickly can Quality Score be improved?

Landing page experience changes (page speed, message-match headlines, clearer calls to action) can produce Quality Score lift within 7–14 days. Expected CTR changes from new ad copy typically take 3–6 weeks to stabilise because Google needs click-volume data to re-estimate CTR. Structural campaign changes compound over 30–60 days.

Why is my Quality Score dropping?

The three most common causes are landing page drift (content has changed since the page was optimised), ad copy decay (ads have been rotating into lower-performing variants), and search-term drift (the keyword is increasingly matching queries with weaker intent, which lowers expected CTR). Pull the three-column Quality Score report in Google Ads — Expected CTR, Ad Relevance, Landing Page Experience — to isolate which component is falling.

Is Quality Score the same on Meta and Microsoft Ads?

No. Meta uses its own quality and engagement rankings, delivered at the ad level rather than the keyword level; the mechanism is structurally similar (reward relevance, penalise poor creative) but the inputs differ. Microsoft Ads uses its own Quality Score that mirrors Google’s closely. The underlying principle — that platforms reduce costs for ads that produce a better user experience — is consistent across paid search and paid social.

Primary sources

Where this definition comes from.

Referenced in this entry

Google Ads Help. About Quality Score. 2025. support.google.com/google-ads/answer/6167118
Google Ads Help. About Ad Rank. 2025. support.google.com/google-ads/answer/1722122
WordStream. Google Ads Benchmarks for Your Industry. 2025 update.
Search Engine Land. How Google Ads Quality Score affects CPC. 2024 auction analysis. searchengineland.com
Optmyzr. Quality Score Benchmarks Study. 2024 account-level analysis.

Get a diagnosis

If your Quality Scores are drifting and you want to know exactly which keywords are leaking spend — and by how much — Chris Gardner reads every audit personally. No templates. No generic recommendations. A diagnostic built on your account data.