Quality Score is Google's 1-10 rating of how relevant and useful your ads are. It's based on expected click-through rate, ad relevance, and landing page experience. Higher Quality Score means lower cost per click and better ad positions.
Quality Score is Google's way of rewarding advertisers who create useful, relevant ads instead of just outbidding everyone. Two advertisers bidding the same amount can get very different positions and prices based on Quality Score.
Each is rated Below Average / Average / Above Average. The combined assessment produces the 1-10 Quality Score visible at the keyword level.
Google's ad auction roughly works like this:
Ad Rank = Bid × Quality Score (simplified)
A bidder with $2 CPC and Quality Score 10 outranks a bidder with $5 CPC and Quality Score 3. And the high-quality bidder pays less per click than the low-quality one. Quality Score is leverage.
Improving Quality Score from 5 to 8 typically reduces CPCs by 25-40% for the same ad positions. For a $10K/month ad spend, that's $2,500-$4,000/month in savings — or 25-40% more clicks at the same budget. This is why Quality Score work usually pays back faster than bid optimization.
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