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Click Through Rate (CTR)

Quick answer

The Click Through Rate (CTR) is a metric that measures the number of clicks advertisers receive on their ads per number of impressions. It is a critical measurement for understanding the efficiency and effectiveness of a specific marketing campaign or advertisement. In A/B testing, it helps teams connect a term, metric, or behavior to a clearer optimization decision.

Key takeaways

  • Click Through Rate (CTR) gives teams shared language for experiment planning and analysis.
  • It should be tied to a clear metric, audience, behavior, or decision whenever possible.
  • Consistent definitions make optimization work easier to compare across tests.

Definition

The Click Through Rate (CTR) is a metric that measures the number of clicks advertisers receive on their ads per number of impressions. It is a critical measurement for understanding the efficiency and effectiveness of a specific marketing campaign or advertisement. It's calculated by dividing the total number of clicks by the number of impressions (views) and multiplying by 100 to get a percentage.

What Click Through Rate (CTR) means in A/B testing

In A/B testing, Click Through Rate (CTR) gives teams a clearer way to describe user behavior, measurement, or decision-making. It is most useful when connected to a primary metric, a specific audience, and the decision the experiment is meant to inform.

Why Click Through Rate (CTR) matters

Click Through Rate (CTR) matters because measurement terms shape how teams judge experiment outcomes. When the definition is clear, marketers and analysts can connect the result to a real user behavior, metric, or business decision instead of relying on vague performance claims.

Example of Click Through Rate (CTR)

For example, a growth team may test a new landing-page message and use Click Through Rate (CTR) to understand whether the change affected the intended behavior. The term helps turn a test result into a specific next step instead of a generic statement that the page performed better or worse.

How to use Click Through Rate (CTR)

Use Click Through Rate (CTR) as part of your experiment documentation. Define the metric or behavior it refers to, choose where it fits in the funnel, and use the same definition when comparing results across tests.

Common mistake

A common mistake is using Click Through Rate (CTR) as a vague label instead of tying it to a measurable behavior or decision. If different teammates mean different things by the same term, experiment planning and result interpretation become less reliable.

Related A/B testing terms

FAQ

What does click through rate (CTR) mean in A/B testing?

The Click Through Rate (CTR) is a metric that measures the number of clicks advertisers receive on their ads per number of impressions. It is a critical measurement for understanding the efficiency and effectiveness of a specific marketing campaign or advertisement. In A/B testing, it helps teams connect a term, metric, or behavior to a clearer optimization decision.

Why does click through rate (CTR) matter for experiments?

Click Through Rate (CTR) matters because measurement terms shape how teams judge experiment outcomes. When the definition is clear, marketers and analysts can connect the result to a real user behavior, metric, or business decision instead of relying on vague performance claims.

How should teams use click through rate (CTR) in an experiment?

Use Click Through Rate (CTR) as part of your experiment documentation. Define the metric or behavior it refers to, choose where it fits in the funnel, and use the same definition when comparing results across tests.

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