What is Caffeine Half Life Calculator?

Amount of caffeine consumed, e.g., an espresso shot ~63 mg, a cup of coffee ~95 mg, energy drink ~80 mg. Typical range: 50-500 mg. Average half-life of caffeine in healthy adults: 3-7 hours, 5 hours typical. Smokers may have a half-life of 3 hours, pregnant women up to 15 hours.