Quality Score

Quality Score is Google Ads' rating system for how relevant and useful your ad, keyword, and landing page combination is to users, expressed on a 1-10 scale per keyword. It's built from three components: expected click-through rate, ad relevance to the keyword, and landing page experience.

This score directly affects your ad rank and the actual cost-per-click you pay, not just your bid amount. A high Quality Score can let you win a better ad position at a lower cost than a competitor bidding higher but scoring lower on relevance and experience. The Campaign ROI Calculator can help model how CPC efficiency, partly driven by Quality Score, affects overall campaign return.

Ad Rank = Bid Amount × Quality Score (simplified; Google's actual formula includes additional real-time factors)

Actual CPC ≈ (Next Highest Ad Rank / Your Quality Score) + $0.01

Two advertisers bid $2.00 per click on the same keyword. Advertiser A has a Quality Score of 8, Advertiser B has a Quality Score of 4.

• Advertiser A's ad rank: $2.00 × 8 = 16
• Advertiser B's ad rank: $2.00 × 4 = 8

Advertiser A wins the better ad position despite bidding the same amount, and often ends up paying a lower actual CPC than Advertiser B for that same position, purely because of the quality score gap.

• Calculated per keyword, not per account or campaign. The same account can have wildly different Quality Scores across its keyword list depending on ad and landing page match quality for each one.
• Expected CTR typically carries the most weight. Ads that historically get clicked more for a given keyword tend to score better, making tight, relevant ad copy the highest-leverage lever to pull.
• Landing page experience is evaluated, not just ad copy. Page load speed, relevance to the ad, and navigational clarity all factor in, a mismatch here caps your score even with great ad copy.
• A better score lowers CPC for the same ad position. This is the direct financial incentive to optimize for quality rather than just outbidding competitors.
• Improving Quality Score compounds over time. Better CTR feeds into a better score, which improves ad position, which often further improves CTR, a reinforcing cycle worth actively managing rather than treating as fixed.