Definition of CTR (Click-through rate)

The CTR, Click-through rate, is the share of the ad impressions that leads to a click.

If you have 10,000 ad impressions and 20 clicks, you got a CTR of 0.002 or 0.2 %.

See also:

• Definiton of an impression
• Definiton of a click
• How to calculate Click-through rate

I also recommended using the CPM calculator to make sure you get your numbers right.