Caffeine Safe Daily Limit
Determine the safe daily caffeine limit based on body weight, per EFSA (2015) guidelines: ≤6 mg/kg/day for habitual consumption, ≤400 mg/day general cap, ≤200 mg single dose.
Results
What is it?
Determines your safe daily caffeine limit based on EFSA (2015) guidelines: a maximum of 6 mg/kg/day for habitual consumption (capped at 400 mg/day for healthy adults) and a single-dose ceiling of 200 mg to avoid acute adverse effects like jitteriness and tachycardia.
How to use
Enter your body weight. The calculator computes your weight-based daily limit (6 mg/kg, capped at 400 mg), your safe single-dose maximum (3 mg/kg, capped at 200 mg), and an approximate number of standard coffee cups (~95 mg caffeine each).
Example scenario
A 70 kg adult: weight-based limit = 70 × 6 = 420 mg, capped at 400 mg/day (≈ 4.2 cups of coffee). Single dose max = min(70 × 3, 200) = 200 mg. So up to ~4 cups spread across the day, with no more than ~2 cups at once.
Pro tip
Caffeine has a half-life of 5–6 hours — avoid it within 8 hours of bedtime for optimal sleep quality. Pregnant women should limit intake to 200 mg/day per EFSA guidance. Tolerance develops with habitual use, but the cardiovascular ceiling remains the same.