Click-through rate measures how often an impression leads to a click. Conversion rate measures how often a defined interaction leads to a chosen action. CTR helps assess the response to an ad; conversion rate helps assess what happens further along the journey.
A high CTR does not guarantee sales. A strong conversion rate does not automatically mean a campaign can attract enough customers at an acceptable cost.
Use the correct formulas
CTR = clicks ÷ impressions × 100.
The conversion-rate formula depends on the report. For a website analysis, you might use:
Session conversion rate = sessions with a conversion ÷ eligible sessions × 100.
An ad platform may use conversions divided by attributable ad interactions. Google explains that definition in its conversion-rate documentation.
Write the denominator beside the metric. “4% conversion rate” is incomplete if nobody knows whether the base is clicks, sessions, users, or leads.
A worked campaign example
Suppose an ad generates 20,000 impressions, 400 link clicks, and 360 website sessions. Eighteen of those sessions include a sign-up.
| Measure | Calculation | Result |
|---|---|---|
| Link CTR | 400 ÷ 20,000 × 100 | 2% |
| Session sign-up rate | 18 ÷ 360 × 100 | 5% |
| Sign-ups per ad click | 18 ÷ 400 × 100 | 4.5% |
The last two figures answer different questions. Neither is wrong when labeled correctly. They should not be placed in the same column as though they were identical.
The numbers here are teaching examples, not industry benchmarks.
What can high CTR and low conversion rate mean?
Start by checking whether the ad’s promise matches the destination. A “free template” ad that leads to a paid product page creates a clear expectation problem.
Then inspect the mobile experience, page loading, form errors, price visibility, and tracking setup. Also check whether the clicks were the type you intended to measure. “All clicks” can include interactions that never lead to the website.
Use the message-match guide to review the handoff from ad to landing page.
What can low CTR and high conversion rate mean?
The offer may appeal strongly to a small, relevant audience. Or the creative may be poor at explaining an otherwise useful product.
Review the opening message and visual before changing the landing page. Keep cost per useful conversion in view: cheap clicks are not the only goal.
Compare like with like
Use the same click definition, conversion action, date range, and attribution rules. Allow for conversions that appear after a delay.
Avoid declaring a winner from a handful of clicks or one sale. A small change in the numerator can move a rate sharply when the sample is small.
What is a good CTR or conversion rate?
There is no universal target that applies to every audience, placement, product, and price. Compare with a relevant baseline from your own campaigns and check whether the result supports the campaign objective.
Use the CTR calculator and conversion-rate calculator for arithmetic, then explain what your inputs represent. Clear definitions make the result useful.