Click-Through Rate: Formula, Channels, and Business Value

Updated September 20, 2026· 8 min read

Click-through rate (CTR) is clicks divided by impressions. Google Ads writes it as clicks ÷ impressions and illustrates 5 clicks from 100 impressions as 5%. Marketers use CTR to see whether an ad, listing, or email earned a response relative to how often it was shown. It is a doorway metric. Pair it with conversion rate and lead quality before you call the click useful.

Use CTR next to ad impressions, Quality Score, and the Search-specific how to improve CTR in Google Ads diagnostic. Broad match changes the query mix that sits under the rate. Paid search is where most of this work is staffed.

Formula and comparability

CTR (%) = (clicks / impressions) x 100

What changes the number without a “better ad”:

Factor	Why CTR moves
Impression definition	Served impressions and viewable impressions use different denominators
Position	Top of search versus below results
Query or audience mix	Brand terms click more than research terms
Format	Search text, display image, skippable video, CTV
Assets	Extra sitelink clicks still sit in the same CTR
Frequency	Repeat exposure can depress clicks

Google’s CTR article notes that observed CTR can inform the expected CTR diagnosis. Read that together with the more precise Quality Score page: Quality Score is a 1-10 diagnostic, not an auction input. Ad Rank is computed at auction time from bid, auction-time quality (which can include expected CTR), thresholds, competition, context, and assets. Use Quality Score to investigate a keyword, not as an account-average bid lever.

Channel table: what a “click” even is

Channel	Usual CTR denominator	What a click usually means	What to pair it with
Search ads	Clicks / impressions	Response to a query	Conversion rate, qualified-lead rate, CPC
Display	Clicks / impressions (viewability rules may differ from serving)	Interest during content browsing	Viewable CTR if you use it, plus on-site quality
YouTube / skippable video	Clicks / impressions for CTR; views / impressions for TrueView view rate	A click is a CTA or companion click; a view is a qualified watch	TrueView view rate for creative pull. Google notes CTR is usually not the priority on awareness video, and that conversions can be attributed on views without a click
CTV / streaming TV	Often no comparable click	Completion, reach, frequency, later site activity	Delivery and incrementality, not Search-style CTR
Email	Unique recipients who clicked / delivered messages for click rate	Interest from a known list	Some tools separately report click-to-open rate with opens as the denominator. Name the metric and account for bot filtering (Mailchimp)

Google’s YouTube metrics Help states TrueView view rate = views / impressions, and that about 10-15% is considered average for in-stream across industries, with format-specific view and impression rules. Treat that 10-15% as Google’s Help characterization for in-stream, not a third-party census, and not a CTR benchmark.

Benchmarks, dated and scoped

LocaliQ’s 2026 search advertising benchmarks (published with WordStream by LocaliQ, page updated 1 June 2026) report an average search CTR of 6.64% across the industries in that study. The public table ranges from 5.56% (Automotive, Repair, Service & Parts) to 12.75% (Arts & Entertainment). The downloadable 2026 guide describes 13,474 US search campaigns running April 2025 through March 2026, covering Google Ads and Microsoft Ads customer accounts. That is a vendor customer sample, not every advertiser, and not Display, YouTube, or CTV.

Use it as context. Then compare your account to its own query mix.

Worked calculation: identical CTRs, different value

Hypothetical two campaigns, same 30-day window.

	Campaign A (repair search)	Campaign B (display prospecting)
Impressions	20,000	200,000
Clicks	800	8,000
CTR	4.0%	4.0%
CPC	$8	$1.50
Spend	$6,400	$12,000
Conversions (qualified leads)	160	80
Conversion rate	20%	1%
Cost per qualified lead	$40	$150

CTR is 4.0% in both rows. Campaign A produced twice as many qualified leads at roughly one-quarter the cost per lead. Raising Campaign B’s CTR to 6% by widening placements could add clicks that look efficient and still miss the $40 lead-cost target.

That is the guardrail for Search CTR work as well: improving Google Ads CTR is a message and eligibility project, not a profit strategy by itself.

Frequently Asked Questions

How do you calculate click-through rate?

CTR = clicks / impressions, then multiply by 100 for a percent. Google’s Help example is 5 clicks from 100 impressions, or 5%. Name the impression definition. A served ad, a viewable ad, and a video view are not the same denominator.

What is a good CTR?

There is no universal good rate. Compare against the same channel, query or placement mix, and your own history. LocaliQ’s 2026 search-advertising averages, from WordStream by LocaliQ customer campaigns, put overall search CTR at 6.64%, with industry averages in that report from 5.56% to 12.75%.

Is CTR a Quality Score input at auction time?

Observed CTR is a performance metric. Expected CTR is one of three Quality Score components, a keyword diagnostic versus other advertisers on exact searches. Google states that Quality Score is not an auction input. Auction-time Ad Rank uses live quality, which can include expected CTR, plus bid, assets, and context.

Why can two campaigns have the same CTR and different value?

Clicks are not equal. A 5% CTR on high-intent search with a 20% conversion rate is a different business than a 5% CTR on a display placement with a 1% conversion rate, even if both spent the same amount per click.

Sources

• Google Ads Help, Clickthrough rate (CTR): Definition
• Google Ads Help, About Quality Score for Search campaigns
• Google Ads Help, About Ad Rank
• Google Ads Help, About YouTube ads and view metrics
• Mailchimp, About open and click rates
• LocaliQ, Search Advertising Benchmarks for Every Industry, 2026 data
• WordStream by LocaliQ, 2026 Google Ads Benchmarks guide (PDF)