Free Caffeine Tools
Caffeine Half-Life & Sleep Calculator
Free caffeine half life calculator. Enter the mg, the time you drank it and your bedtime to see how much caffeine is left in your system at night.
Open tool → CalculatorCoffee Caffeine Calculator
Find how much caffeine is in a cup of coffee. Pick a brew method and cup size for the mg in your cup and its share of the FDA's 400 mg a day.
Open tool → CalculatorDaily Caffeine Limit Calculator
Find the published daily caffeine limit for a healthy adult, pregnancy or ages 12–18, plus coffee equivalents and adult single-dose guidance.
Open tool → CalculatorEnergy Drink Caffeine Calculator
Find how much caffeine is in Monster energy drinks and other popular energy drinks by product and number of cans or shots.
Open tool → CalculatorEspresso Caffeine Calculator
How much caffeine in an espresso shot? Pick your shots, ristretto to lungo, arabica or robusta, decaf too — get the mg and your share of 400 mg a day.
Open tool → CalculatorMatcha & Tea Caffeine Calculator
Estimate how much caffeine is in matcha and brewed tea, plus its share of the FDA 400 mg daily figure.
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