Your Safe Caffeine Intake
Note: Our calculations are based on research from scientific studies. For more information, see our references section below.
Frequently Asked Questions
For healthy adults, a safe daily caffeine intake is generally considered to be up to 400 mg per day. However, this varies based on individual factors like body weight, age, and health conditions. Our calculator uses a base of 3 mg per kg of body weight and adjusts for health factors.
Body weight significantly affects safe caffeine intake. The general guideline is 3 mg of caffeine per kg of body weight. For example, a 70 kg person would have a safe intake of about 210 mg per day. Lighter individuals should consume less caffeine to avoid adverse effects.
Several health factors affect safe caffeine intake: pregnancy (70% reduction), heart conditions (50% reduction), anxiety disorders (30% reduction), sleep disorders (20% reduction), liver disease (40% reduction), and age (teens and elderly need reduced intake).
References
- EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA). "Scientific Opinion on the safety of caffeine." EFSA Journal 13.5 (2015): 4102.
- Nawrot, P., et al. "Effects of caffeine on human health." Food Additives & Contaminants 20.1 (2003): 1-30.
- Institute of Medicine (US) Committee on Military Nutrition Research. "Caffeine for the Sustainment of Mental Task Performance: Formulations for Military Operations." National Academies Press (US), 2001.