Caffeine Limit Calculator
Enter your typical daily intake, body weight and age to see a conservative estimate of a daily caffeine limit and comparisons (cups of coffee, energy drinks). Not medical advice.
Calculator
Estimated conservative limit:
— mg/day
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Disclaimer: This tool provides a conservative, non-clinical estimate only. It is not medical advice. Individual sensitivity to caffeine varies. If you're pregnant, breastfeeding, have cardiovascular conditions, take medications, or are under 18, consult a healthcare professional.
How we estimate
We show two references: (A) a general adult guideline commonly cited (up to 400 mg/day for most healthy adults), and (B) a conservative body-weight-based heuristic. The heuristic uses 3 mg per kg of body weight for adults (a conservative safety factor). For people under 18 we use 2.5 mg/kg as a more cautious guideline. The displayed limit is the lower of guideline (A) and heuristic (B).
Examples / common caffeine amounts
| Item | Typical caffeine |
|---|---|
| 8 oz (240 ml) brewed coffee | ~95 mg |
| 1 shot espresso (30 ml) | ~63 mg |
| 8 oz energy drink | 70–150 mg |
| 1 can cola (330 ml) | ~35 mg |
| 1 cup black tea (240 ml) | ~47 mg |
Use these values to convert cups/drinks to mg when entering your daily intake.