What is Click-Through Rate (CTR) in Digital Advertising?
Click-Through Rate (CTR) measures how often people click your ad after seeing it. It is calculated by dividing total clicks by total impressions and showing the result as a percentage.
Marketers use CTR across Google Ads, Meta, display networks, and email campaigns to gauge initial interest. A higher CTR often indicates that your headline, image, or offer connects well with the audience seeing it.
The Core CTR Formula
To find your CTR, divide total clicks by total impressions, then multiply by 100 to get a percentage:
Click-Through Rate Equation
Where:
- Total Clicks: The number of times users clicked your ad or link.
- Total Impressions: The total number of times your ad was displayed.
- 100: Converts the raw fraction into a percentage.
Three Variations of the CTR Formula
Depending on what numbers you have, you can rearrange the formula to find clicks, impressions, or CTR:
| Goal | Formula | When to Use It |
|---|---|---|
| Find CTR (%) | CTR = (Clicks ÷ Impressions) × 100 |
Review performance after an ad campaign has delivered views and clicks. |
| Estimate Clicks | Clicks = (CTR ÷ 100) × Impressions |
Forecast website visits from an expected impression volume and target CTR. |
| Estimate Impressions Needed | Impressions = Clicks ÷ (CTR ÷ 100) |
Work out how many views you need to hit a specific click target. |
How to Calculate CTR: Step-by-Step Example
Here is a simple example using hypothetical campaign numbers:
- Impressions: 80,000
- Clicks: 1,200
Step 1: Divide clicks by impressions
1,200 ÷ 80,000 = 0.015 (the click rate per view)
Step 2: Multiply by 100
0.015 × 100 = 1.50%
In this example, the campaign achieved a 1.50% CTR.
CTR vs CPC vs CPM: How Key Ad Metrics Connect
CTR connects cost-per-thousand impressions (CPM) with cost-per-click (CPC). It shows how effectively impressions turn into paid traffic.
| Metric | What It Measures | Why It Matters | Formula Link |
|---|---|---|---|
| CTR (Click-Through Rate) | Percentage of views that lead to clicks | Measures ad response | Bridges CPM and CPC |
| CPM (Cost Per Mille) | Price per 1,000 ad impressions | Tracks overall media cost | CPM = CPC × CTR (%) × 10 |
| CPC (Cost Per Click) | Price paid for each click | Tracks direct traffic cost | CPC = CPM ÷ (CTR (%) × 10) |
Practical Tip: If you buy ads on a CPM basis, raising your CTR lowers your effective cost per click. For example, at an $8.00 CPM, doubling your CTR from 1.0% to 2.0% reduces your effective CPC from $0.80 down to $0.40. Use our CPC to CPM Calculator to compare bidding models.
What Counts as Clicks and Impressions?
Not every ad platform tracks clicks and impressions the same way. Keeping a few practical differences in mind helps when comparing campaign reports:
- Link clicks vs. total clicks: Many ad networks track all user interactions (such as image zooms, profile clicks, or video pauses) separately from outbound link clicks to your website. For landing page traffic, outbound link click CTR gives the clearest picture.
- Served vs. viewable impressions: Served impressions count every ad loaded by the ad server, even if a user scrolls past quickly. Viewable impressions only count ads that actually appeared on screen.
- Multiple clicks per person: If someone clicks your ad twice, some platforms count both clicks while others deduplicate them within a short window.