CTR Calculator: Click-Through Rate, Clicks & Impressions

Advertising and campaign calculator

CTR Calculator

Calculate click-through rate from clicks and impressions, estimate clicks from a target CTR, or find the impressions associated with a click goal.

Enter the whole number of times the item was shown.
Enter recorded whole clicks, including zero.
Enter 2.5 for 2.5%, not 0.025.

Click-through rate (CTR) is the percentage of impressions that produced a click. It is commonly used for ads, search results, email campaigns, videos and other clickable placements. This calculator also reverses the formula to estimate clicks or impressions.

CTR formulas

Click-through rate: CTR (%) = clicks ÷ impressions × 100

Expected clicks: clicks = impressions × target CTR ÷ 100

Theoretical impressions: impressions = clicks ÷ (target CTR ÷ 100)

The calculator also expresses CTR as a decimal, clicks per 1,000 impressions and impressions per click. These are unit views of the same ratio, not separate performance forecasts.

How to use the calculator

  1. Select CTR, clicks or impressions as the value to calculate.
  2. Enter the two active values. Counts must be whole numbers; target CTR is entered as a percentage.
  3. Keep clicks and impressions from the same placement, audience and reporting period.
  4. Select Calculate CTR. Fractional planning outputs are shown separately from whole-event thresholds.

Verified examples

InputsCalculationResult
2,500 clicks and 100,000 impressions2,500 ÷ 100,000 × 1002.5% CTR; 0.025 decimal; 25 clicks per 1,000 impressions
75,000 impressions at a 1.8% target CTR75,000 × 1.8 ÷ 1001,350 expected clicks; 73,650 expected non-clicked impressions
500 clicks at a 2.5% target CTR500 ÷ 0.02520,000 theoretical impressions; 40 impressions per click

How to interpret CTR

A higher CTR means a larger share of impressions generated clicks, but it does not by itself prove that a campaign was profitable or useful. A click can fail to convert, and a narrow high-intent audience can behave differently from a broad awareness audience.

Compare CTR only across similar channels, placements, devices, audiences and date ranges. Email CTR may use delivered emails as the denominator, while advertising platforms normally use recorded impressions. Use the denominator reported by the platform and do not mix it with opens, recipients or unique users unless the metric is explicitly defined that way.

Rounding and whole events

Clicks and impressions are observed as whole events, but a planning formula can return a fraction. In click-planning mode, the calculator shows the direct expected value and the minimum whole-click threshold that meets or exceeds the target ratio. In impression-planning mode, it shows the theoretical ratio and a rounded-up whole-impression plan. These rounded values are planning aids, not guarantees.

Limits and assumptions

  • Impressions must be whole numbers from 1 to 1 trillion.
  • Recorded clicks may be zero; desired clicks must be at least 1. Both are limited to 1 billion.
  • Recorded clicks cannot exceed impressions when calculating an observed CTR.
  • Target CTR must be greater than 0% and no more than 100%.
  • Calculated clicks and impressions are limited to 1 trillion.
  • The model assumes one consistent CTR and does not model auction changes, frequency, bot filtering, delayed reporting or attribution.

Important: CTR is an engagement ratio, not a conversion rate, cost metric, revenue forecast or guarantee of campaign performance.

Frequently asked questions

Is CTR the same as conversion rate?

No. CTR divides clicks by impressions. Conversion rate normally divides conversions by clicks, sessions or another defined opportunity. State the denominator whenever comparing rates.

Can CTR be more than 100%?

Not in this calculator. It treats clicks as events within the entered impressions and rejects recorded clicks above impressions. Some platforms can report unusual ratios when repeated clicks, denominator definitions or adjustments differ.

What happens when there are zero clicks?

With positive impressions, zero clicks produces a valid 0% CTR. Impressions per click is then undefined, so the calculator displays “No clicks recorded” instead of dividing by zero.

Does this calculate CPC or ROAS?

No. CTR uses clicks and impressions. CPC uses spend and clicks, while ROAS uses attributed revenue and ad spend. Use the related calculators for those distinct questions.

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