Daily Caffeine Intake Calculator
Calculate Daily Caffeine
Formula
Total Caffeine (mg) = (Coffee cups x mg per cup) + (Tea cups x mg per cup) + (Energy drinks x 160mg) + (Sodas x 34mg). FDA daily limit: 400mg for adults. Caffeine half-life: ~5 hours.
Frequently Asked Questions
How much caffeine is safe per day?
The FDA recommends up to 400mg of caffeine per day for healthy adults, equivalent to about 4 cups of brewed coffee. Pregnant women should limit to 200mg. Children and adolescents should consume significantly less.
How long does caffeine stay in your system?
Caffeine has a half-life of about 5 hours, meaning half the caffeine is still in your system 5 hours later. It can take 10+ hours to fully clear. This is why experts recommend avoiding caffeine after 2 PM for better sleep.
Which has more caffeine: coffee or tea?
Coffee generally has 2-3x more caffeine than tea per cup. An 8 oz cup of brewed coffee has about 95mg, while black tea has about 47mg and green tea about 28mg. However, matcha (70mg per serving) comes close to coffee.
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