Depends on what kind of cookies! For instance, a regular sugar cookie has 71.7 calories. A regular chocolate chip cookie has 45.3 calories A regular peanut butter cookie has 71.5 calories. Please check the related links to see calories for other cookie types.
The exact amount of calories will depend on the brand and formulation of the peanut butter, but as a good approximation, you can assume about 90 calories with about 65 of those calories coming from fat.