Health & Fitness · Free tool
Caffeine Intake Calculator
Log coffee, tea, soda, and energy drinks and see daily caffeine in mg with the 400 mg safe-limit benchmark.
Updated April 2026
Total caffeine
218 mg
% of FDA daily limit (400 mg)
55%
Hours until bed
6.1 h
Caffeine remaining at bedtime
93 mg
Using a 5-hour half-life. Above ~50mg at bedtime may disrupt sleep for many adults.
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What it does
Log coffee, tea, soda, and energy drinks and see daily caffeine in mg, with the 400 mg adult safe-limit as a visible benchmark. Sensitive to afternoon timing too, so you can see how late caffeine interferes with sleep.
Pair with water intake calculator, sleep cycle calculator, alcohol unit calculator, and calorie calculator.
How to use it
- Log each drink with size and time.
- Read total mg and time-of-last-drink.
- Compare to the 400 mg safe-limit line.
- Move late drinks earlier if sleep is an issue.