How do you calculate cost per click?

Average cost-per-click (avg. CPC) is calculated by dividing the total cost of your clicks by the total number of clicks. Your average CPC is based on your actual cost-per-click (actual CPC), which is the actual amount you’re charged for a click on your ad.

For More Information Please Refer: https://support.google.com/google-ads/answer/14074?hl=en