Caffeine Limit Calculator
Find your personal daily caffeine ceiling — most adults should stay under 400 mg, and heavy bodyweight lowers the safe maximum.
Safe daily limit
400 mg
Brewed coffee 240 ml (95 mg)
4.2 cups
Espresso shot (65 mg)
6.2 shots
Black tea 240 ml (47 mg)
8.5 cups
Energy drink 250 ml (80 mg)
5 cans
Most healthy adults should stay under 400 mg/day. Pregnant? Keep under 200 mg/day regardless of weight.
Formula
safe daily caffeine ≈ 5.7 mg per kg body weight (cap 400 mg for most adults)How to use the Caffeine Limit Calculator
- 1Enter your body weight
- 2See your safe daily caffeine limit in mg
- 3Check how many coffees, teas or energy drinks that is
Frequently Asked Questions
How much caffeine is safe per day?
Up to 400 mg/day for healthy adults (FDA) — roughly 4 cups of coffee. Above 5.7 mg/kg, jitters and insomnia risk climb.
Is caffeine safe during pregnancy?
Pregnant people are advised to stay under 200 mg/day — this calculator's weight-based number doesn't apply then.