Yes, espresso has more caffeine per fluid ounce than other coffee brewing methods. A single 1 oz shot of espresso contains around 50 mg of caffeine, whereas 1 oz of French press contains just 8 mg of caffeine (8). However, it's crucial to consider serving size. Espresso is often consumed as a 2 oz double shot for a total of 100 mg of caffeine, whereas you might serve french press in an 8 oz cup for a total of 145 mg of caffeine.