What click-through rate measures
Click-through rate (CTR) is the share of impressions that turn into a click. It answers a simple question: of all the times people saw your ad, email link, search result or banner, how often did someone click it? Google Ads Help defines it the same way, as clicks divided by impressions (Google Ads Help: Clickthrough rate).
Because the formula has three parts, you can solve for any one of them. The calculator does this with the "What do you want to find?" switch.
A worked example
A search ad was shown 48,000 times and clicked 1,200 times. It cost $600.00 and brought in 36 sign-ups.
- CTR: 1,200 ÷ 48,000 × 100 = 2.50%, or about one click for every 40 impressions.
- CPC: $600.00 ÷ 1,200 = $0.50 per click. CPM: $600.00 ÷ 48,000 × 1,000 = $12.50.
- Conversion rate: 36 ÷ 1,200 × 100 = 3.00%. CPA: $600.00 ÷ 36 = $16.67 per sign-up.
- To get 1,500 clicks at the same CTR, you need 1,500 ÷ 2.50% = 60,000 impressions.
Small CTR changes add up. With the same 48,000 impressions, 3.00% brings 1,440 clicks (240 more) and 3.50% brings 1,680 (480 more). If the CPM stays the same, every extra click lowers the cost per click. The "What if" table under the result shows this for your own numbers.
The calculator keeps full precision and only rounds what it shows: CTR to two decimals, clicks to whole clicks, and impressions up to the next whole impression, so a goal is never missed by a fraction.
CTR vs conversion rate and the other ad metrics
CTR sits near the top of the funnel. It tells you whether people who see the ad want to know more. What they do after the click is measured by the metrics further down.
| Metric | Formula | What it tells you |
|---|---|---|
| CTR | Clicks ÷ Impressions | Does the ad, subject line or snippet make people click? |
| Conversion rate | Conversions ÷ Clicks | Do the page and the offer turn visitors into customers? |
| CPC | Cost ÷ Clicks | What one visit costs you. |
| CPM | Cost ÷ Impressions × 1,000 | What attention costs, before anyone clicks. |
| CPA | Cost ÷ Conversions | What one sale, sign-up or lead costs. |
A high CTR with a weak conversion rate usually means the ad promises something the landing page does not deliver, or it attracts curious people who were never going to buy. A low CTR with a strong conversion rate can be fine: the ad filters out the wrong people. Judge a campaign by the CPA or by the return, not by CTR alone. The CPM calculator plans a budget from impressions, and the ROAS calculator shows whether the revenue covers the spend.
What affects your CTR
- Position. Compare CTRs only at similar positions, so a change in rank does not hide a change in the ad or snippet itself.
- Relevance. Google Ads Help notes that keywords, ads and listings that closely match each other and your business are more likely to get clicks. An ad that repeats what the person searched for, in their words, gets noticed.
- Ad copy, subject lines and titles. Test a clear benefit, a specific number or price, or a concrete next step against your current wording, and let the Compare tab tell you which one wins. For organic results, the page title and meta description are your ad copy; the meta tag generator helps you write them, and the SERP snippet preview shows how they may look in Google.
- Rich results. Structured data can make a page eligible for stars, prices, dates and other extras in Google Search. In case studies published by Google, Rotten Tomatoes measured a 25% higher CTR on pages with structured data and Nestlé an 82% higher CTR for pages shown as rich results (Google Search Central: Introduction to structured data). Google also says it does not guarantee that structured data will show up in results (structured data policies), so treat those numbers as examples, not a promise.
- Audience and placement. The same banner can get a very different CTR on two sites, and the same email on two lists. Compare CTRs within one placement or one list before you compare across them.
- Tracking. Untagged links make it hard to know which ad or email the clicks came from. The UTM builder adds campaign tags that analytics tools can read.
We do not list "average CTR" figures here. Google Ads Help says a good CTR depends on what you advertise and on which network, and averages from studies mix industries, positions and ad formats in ways that rarely match your situation. Your own past campaigns are the better benchmark.
Search Console CTR vs ad CTR
Both use clicks divided by impressions, but they count different things, so the numbers are not directly comparable.
- Search Console counts an impression when your page appears on the results page the user loads, even if they never scroll down to it. Items inside a carousel only count once they are scrolled into view. Average position is the average of your topmost result for each query (Search Console Help: impressions, position and clicks, Performance report).
- Google Ads counts an impression each time your ad is shown, and each ad and keyword has its own CTR.
A site-wide Search Console CTR blends brand searches you rank first for with thousands of queries where you sit on page two. That is why it often looks low. Filter by query, page and position before you judge it, and compare a page with itself over time rather than with an ad.
Is the difference real?
Two ads rarely have exactly the same CTR, even when they are equally good. The Compare tab runs a two-proportion z-test at 95% confidence between the best row and each other row, the same test the A/B test significance calculator uses.
With its example numbers, Ad B gets 1,431 clicks from 51,000 impressions (2.81%) and Ad A 1,200 from 48,000 (2.50%), 12.2% higher. The z-score is 2.99 and the p-value 0.003: if both ads had the same true CTR, a gap this large would turn up by chance well under 5% of the time, so it is likely real. With a tenth of the impressions and the same rates, the p-value is 0.347, and the same gap could easily be luck.
Run the ads at the same time, to the same audience, and decide on the number of impressions before you look. Checking every day and stopping at the first good-looking result makes chance wins far more likely.
Common mistakes
- Averaging CTRs. An ad with 5.00% on 4,000 impressions and one with 0.50% on 60,000 average 2.75%, but the real combined CTR is 500 ÷ 64,000 = 0.78%. Always add up clicks and impressions first.
- Mixing up percent and points. Going from 2% to 3% is one percentage point, but a 50% increase. The "What if" table uses points.
- Counting the wrong clicks. If your email tool shows both unique and total clicks, use the same kind on both sides when you compare, and unique clicks for a rate per recipient.
- Judging on tiny numbers. Three clicks from 50 impressions is 6%, but the next 50 could easily bring none. Let the Compare tab tell you when the data is too thin.
- Optimizing CTR alone. Clickbait raises CTR and wastes budget on visitors who leave. Check the conversion rate and CPA next to it.
How to use the CTR calculator
- 1Choose what you want to find: the CTR, the clicks you can expect, or the impressions you need for a number of clicks.
- 2Enter the other two numbers. Add your ad spend and conversions for CPC, CPM, conversion rate and CPA.
- 3Check the "What if" table to see what a higher CTR would bring.
- 4To compare ads, emails, keywords or pages, switch to Compare, enter up to four rows and see the ranking and whether the gaps are likely real. Copy the result, a link with all your numbers, or the table as CSV.
Frequently asked questions
How do you calculate CTR?
Divide the clicks by the impressions and multiply by 100. An ad with 1,200 clicks from 48,000 impressions has a CTR of 1,200 ÷ 48,000 × 100 = 2.50%. In a spreadsheet, use =B2/A2 with impressions in A2 and clicks in B2, and format the cell as a percentage.
What is a good click-through rate?
There is no single number. Google Ads Help says a good CTR depends on what you advertise and on which network, and the same is true for email and organic search. The most useful benchmark is your own history: the same channel, a similar position and a similar audience. Treat published averages from other companies with care unless you know exactly how they were measured.
What is the difference between CTR and conversion rate?
CTR measures how many impressions turn into clicks. Conversion rate measures how many of those clicks turn into a sale, a sign-up or a lead. CTR tells you whether the ad, subject line or search snippet works; conversion rate tells you whether the page and the offer behind it work. A high CTR with a low conversion rate often means the ad promises something the page does not deliver.
How many impressions do I need for a number of clicks?
Divide the clicks you want by the CTR. At a 2.50% CTR, 1,500 clicks take 1,500 ÷ 2.50% = 60,000 impressions. Choose Impressions under "What do you want to find?" and the calculator rounds up to whole impressions, so you never fall short.
Is Search Console CTR the same as Google Ads CTR?
The formula is the same, clicks divided by impressions, but the counting is different. Search Console counts an impression when your page appears on the results page the user loads, even if they never scroll to it, and reports the position of your topmost result. Google Ads counts an impression each time the ad is shown. So a Search Console CTR mixes every query and position, and the two numbers are not directly comparable.
How do I know if one ad really has a better CTR?
Use the Compare tab. It runs a two-proportion z-test at 95% confidence on each pair. With 1,431 clicks from 51,000 impressions against 1,200 from 48,000, the p-value is 0.003, so the gap is very likely real. With a tenth of the data and the same rates, the p-value is 0.347 and the gap could easily be chance.
Can I average the CTRs of several ads?
No, add up the clicks and the impressions first. An ad with 200 clicks from 4,000 impressions (5.00%) and one with 300 from 60,000 (0.50%) average 2.75%, but together they got 500 clicks from 64,000 impressions, a real CTR of 0.78%.