Expected Click-Through Rate

Expected Click-Through Rate (Expected CTR) is one of three components of Google Ads Quality Score that predicts the likelihood of your ad being clicked when it appears for a specific keyword. It is based on historical click performance of the keyword and ad, normalized for position, extensions, and other factors that affect visibility.

Key Takeaways

• Predicts click probability for a specific keyword-ad combination
• Normalized for ad position — accounts for the fact that higher positions naturally get more clicks
• Rated per keyword: Above Average, Average, or Below Average
• One of three Quality Score components with Ad Relevance and Landing Page Experience
• Improved through better ad copy, stronger headlines, and effective use of ad extensions

What Is Expected CTR

Expected CTR is Google’s prediction of how likely users are to click your ad when it shows for a given keyword, independent of ad position and format factors. Unlike actual CTR (which is influenced by your ad’s position on the page), Expected CTR isolates the inherent click-worthiness of your ad-keyword combination.

Aspect	Actual CTR	Expected CTR
What it measures	Historical clicks / impressions	Predicted click probability
Position influence	Yes (position 1 gets more clicks)	No (normalized for position)
Extension influence	Yes (extensions increase clicks)	No (normalized)
Used for	Performance reporting	Quality Score calculation
Visible as	Percentage (e.g., 3.5%)	Rating (Above/Average/Below)

How It Works

Google calculates Expected CTR using:

1. Historical performance — Past CTR data for this keyword in your account and across all advertisers
2. Position normalization — Removes the effect of ad position to evaluate inherent ad quality
3. Format normalization — Adjusts for the presence of extensions, ad formats, and other visual elements
4. Competitive comparison — Your expected CTR is rated relative to other advertisers bidding on the same keyword

The rating appears in the Keywords tab:

• Above average — Your ad is predicted to generate clicks at a higher rate than most competitors for this keyword
• Average — Your ad’s click rate prediction is comparable to competitors
• Below average — Your ad is predicted to generate fewer clicks than competitors

Expected CTR directly feeds into Quality Score, which determines:

• Your Ad Rank in the auction
• Your actual CPC (better Expected CTR = lower costs)
• Your impression share (better Expected CTR = more auction eligibility)

Practical Example

Two advertisers bid on “accounting software for small business”:

Advertiser A (Below average Expected CTR):

• Headline 1: “Business Software Solutions”
• Headline 2: “Learn More Today”
• Description: “We offer a range of software products for businesses of all sizes.”

Advertiser B (Above average Expected CTR):

• Headline 1: “Accounting Software for Small Biz”
• Headline 2: “Free 30-Day Trial — No Credit Card”
• Description: “Invoicing, expense tracking, and tax prep built for small businesses. Setup in 5 minutes.”

Why Advertiser B wins:

Factor	Advertiser A	Advertiser B
Keyword in headline	No	Yes (“Accounting Software”)
Specific value proposition	No	Yes (free trial, no credit card)
Audience match	Generic (“all sizes”)	Specific (“small businesses”)
Call to action	Weak (“Learn More”)	Strong (“Free 30-Day Trial”)
Urgency/proof points	None	”Setup in 5 minutes”

Advertiser B’s ad is predicted to get 2-3x the click rate because it directly addresses the searcher’s intent with specific, compelling copy. This translates to:

• Higher Quality Score (Expected CTR is “Above average”)
• Lower actual CPC (estimated 25-40% less than Advertiser A)
• Better ad position at the same bid

Why It Matters

Expected CTR is the Quality Score component most directly influenced by ad copywriting quality. While Ad Relevance depends on keyword-to-ad group structure and Landing Page Experience depends on website quality, Expected CTR rewards ads that compel users to click. Writing compelling headlines with keyword inclusion, clear value propositions, specific offers, and strong calls to action directly improves Expected CTR. Since it feeds into Quality Score and therefore affects both CPC and ad position, investing in ad copy quality pays dividends across every click and impression in the account.