Google Ads Quality Score Explained (And How to Fix It)
You’re paying more per click than a competitor running a leaner account on a smaller budget. Or you’ve heard the term “Quality Score” — Google even shows it to you right there in the interface — and you’re not sure what it’s supposed to tell you, let alone what to do about it.
Here’s what I’ll tell you: Quality Score is probably the most underrated metric in Google Ads, and I can back that up.
The Short Answer
Quality Score is a 1–10 rating Google assigns to your keywords. It measures three things: expected click-through rate, ad relevance, and landing page experience. A higher score means lower costs and better placement. A lower score means you’re paying a tax the winning bidder isn’t.
This isn’t a soft “best practices” thing. It’s math. And it matters more than almost anything else in your account.
Why I Take Quality Score More Seriously Than Most
I’ve managed 200+ ad accounts. At some point we took a sample of those accounts and ran statistics on what actually correlates with account performance. Quality Score was the #1 predictor — over everything else. Not budget. Not bid strategy. Not the number of ad extensions. Quality Score.
That’s not a talking point I repeat from a Google blog post. It’s what we found. And once you understand what QS actually measures, it makes complete sense.
What Quality Score Actually Measures
Here’s the first-principles version: you only have a few real levers in an ad account. Ad copy. Keywords. Landing page. That’s basically it. Quality Score is just a wrapper that grades you on exactly those three things.
The three components:
- Expected CTR — given your keyword, how likely is someone to click your ad? This is Google predicting your ad’s relevance and pull before it even runs.
- Ad relevance — how closely does your ad copy match what someone searched for?
- Landing page experience — when someone clicks, does the page they land on actually match what they were looking for and give them a reason to stay?
The logic is tight. Someone searches → your ad either matches that search or it doesn’t (CTR + ad relevance) → they click → the page either delivers or it doesn’t (landing page experience). QS is measuring the quality of that whole chain.
Which Component Actually Moves the Needle
This is where most people leave money on the table, so I’ll be specific.
Ad relevance should be a 10/10 every time. It’s 30 characters echoing the search term back at the searcher. If someone searches “emergency plumber Denver” and your ad headline is “Emergency Plumber in Denver — Available 24/7,” that’s ad relevance solved. There’s no excuse for a low score here once you know what it’s measuring.
Expected CTR should be a 10/10 every time. Write ads that give people an actual reason to click — a differentiator, a number, a strong offer. What a good CTR looks like varies by industry, but the principle is the same: ads that speak directly to the search term get clicked.
Landing page experience is where people consistently drop the ball — and it’s the component with the most variability and the deepest impact. I’ve seen accounts where the ads are solid and the keywords are right but the account is underperforming, and when you look at where traffic is landing, you find a homepage built by a web-design agency that charged $5,000 and built something beautiful that does nothing for someone who just searched a specific service term.
That’s not a knock on those agencies — they built what they were asked to build. But a site built to look good isn’t the same as a site built to convert search traffic. When clients come to us after paying a lot for a website that wasn’t built with ad traffic in mind, the landing page work is usually the first thing we do.
The Real Cost of a Low Quality Score
This is where it gets concrete. Here’s roughly what the data shows when you move QS levels:
| Quality Score | Relative CPC | What It Means |
|---|---|---|
| 10/10 | ~30–40% below average | You’re being subsidized for relevance |
| 7–8/10 | At or near average | Baseline competitive cost |
| 5/10 | Average — the floor you want to beat | You’re paying market rate |
| 3–4/10 | 20–30% above average | Paying a relevance tax |
| 1–2/10 | Significantly above average | You’re the most expensive bidder for the same position |
Industry data puts the spread at about $1.20 vs $1.68 for the same click at 10/10 vs 5/10 — that’s a 40% premium for being irrelevant. Google’s own published research points to roughly 30–40% cost reduction when you move from average to high QS. Each point of Quality Score improvement on non-brand keywords is worth roughly 10–20% in CPC reduction.
We just ran this on an account. Themed the ad groups, tightened ad copy, addressed the landing page. CPC dropped 20% in two weeks — a keyword that was running at $13 went to ~$11. Officially, Quality Score needs about six weeks of history before it updates, but leading indicators show up sooner. At scale, that cost difference is the difference between a profitable account and one that’s perpetually breaking even.
How to Fix a Low Quality Score — Starting Today
There’s one move that addresses expected CTR and ad relevance simultaneously, and it’s the most direct path to a better QS on a problem keyword: theme your ad groups.
Every keyword in an ad group should be the same theme. The ads for that group should speak directly to that theme and give people a reason to click. Not a generic “Learn More” ad that could go with any keyword — an ad that reflects exactly what the searcher just typed.
If you have an ad group with 40 keywords that span multiple intents (“roof repair,” “roof replacement cost,” “new roof installation”), split them. Roof repair keywords get their own ad group with ads about roof repair. Replacement cost keywords get their own ad group. Each group’s ads are a direct response to the search terms in that group.
The shortcut: download your ad copy and keywords, hand them to an AI, and say “make these more synergistic — for each ad group, tell me if the ad copy matches the keywords.” It’ll surface the mismatches immediately.
That’s the ad relevance and expected CTR fix. For landing page experience, the question is simpler than people make it: does the page you’re sending people to actually match what they searched for? If someone searched “roofing contractor Denver” and they land on your homepage about the company’s history, that’s not a match. Give them a page that’s about roofing work in Denver, with a clear reason to call or fill out a form.
The Myth: Quality Score as a Monolith
Here’s the mental model problem I see most often. People treat Quality Score like a single thing — “my QS is a 6” — and then try to move the number as if it’s the goal. It’s not.
Quality Score is a composite. It’s not a “thing” — it’s ad relevance + landing page experience + expected CTR wrapped into one number. The useful version of thinking about QS isn’t “how do I raise my score?” It’s “which component is low, and what does that tell me about where the actual problem is?”
Low ad relevance → your ads don’t echo the search terms → theme your ad groups, rewrite the headlines.
Low landing page experience → the page doesn’t match the ad or the search → build a dedicated page or fix the existing one.
Low expected CTR → Google is predicting people won’t click → the ad copy is generic or the offer isn’t compelling.
Fix the component, the number follows. Chasing the number directly is the wrong frame.
This also connects to everything else that drives performance. If you want to understand which metrics actually matter for diagnosing an account, QS components map directly to the two you care most about: CTR and conversion rate. CTR tells you whether the search-to-ad chain is working. Conversion rate tells you whether the ad-to-landing-page chain is working. QS just formalizes that same diagnosis.
When to Get Help
If your Quality Scores are consistently below 5 and you’ve already tried theming your ad groups and rewriting ad copy, the problem is almost certainly the landing page — and that’s a harder fix because it requires either rebuilding the page or building a new one. That’s often where the ROI is, but it’s also where a lot of solo operators stall.
A good account audit will tell you fast. You look at the three QS components for your highest-spend keywords, identify which component is lagging, and trace it back to the specific structural issue. In my experience, accounts that have been running for more than 90 days with persistent low QS haven’t made the connection between keyword themes and ad structure — or they’re running a website they were told is “conversion optimized” that was never actually built with paid search in mind.
The accounts I’ve seen turn around the fastest are ones where the landing page wasn’t the bottleneck — ad structure and copy fixes alone moved things quickly. The ones that take longer are the ones where the website needs real work. Budget for both if you’re starting fresh.
Tired of guessing whether your ads are working?
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