How much caffeine per day, and when should the last cup be?
Up to 400 mg of caffeine a day is considered a safe level for healthy adults (EFSA/FDA). The second half of the question is not how much — but when.
Within the guideline. Have the last serving no later than 17:00 so it doesn’t interfere with sleep (the 6-hour rule).
Sources: EFSA 2015 / FDA (400 mg/day); Drake et al., 2013 — caffeine even 6 hours before bed degrades sleep quality. Drink contents are averages.
How to use the result
How it works
We add average caffeine values for selected drinks and compare them with the 400 mg reference for healthy adults, then mark six hours before bedtime.
How to read the result
Even a total below the reference can disrupt sleep or cause palpitations in sensitive people. Consider amount, timing and how you feel.
Limitations
Pregnancy, some conditions and medicines change appropriate intake, and drinks vary widely. Do not replace individual medical advice with this calculator.
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