The amount of caffeine you’ll get from coffee depends on the type of coffee bean and the way it’s brewed. For brewed coffee, you can count on getting 95 to 200 milligrams in 1 cup of coffee.
One cup of instant coffee may only have 27 milligrams of caffeine, but it could go as high as 173 milligrams, reports MayoClinic.org.
Espresso has the most caffeine, but servings are usually small. You'll get 47 to 75 milligrams from 1 ounce of espresso. That amount works out to at least 375 milligrams if you drank a full cup of espresso.