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The FDA suggests that 400mg of caffeine per day is generally safe for most healthy adults. This is roughly equivalent to 4-5 cups of coffee. However, individual tolerance varies based on weight, age, medication use, and overall health.
Up to 400mg per day for healthy adults
400-600mg may cause side effects in some people
Over 600mg may cause anxiety, insomnia, and other health issues
Understanding how caffeine affects your body
Caffeine blocks adenosine receptors in your brain, preventing drowsiness and promoting alertness.
Can temporarily increase heart rate and blood pressure in some individuals.
Consuming caffeine late in the day can interfere with sleep quality and duration.
Moderate caffeine intake may improve physical and mental performance during exercise.
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At Hesaplamanet.com/en, we're dedicated to providing accurate, user-friendly calculators and tools to help you make informed decisions about your health and daily life. Our team of experts compiles and verifies information from trusted sources to ensure you receive the most accurate results.
Our Caffeine Calculator is designed to help you understand your daily caffeine intake and how it affects your body. We believe that awareness is the first step toward making healthier choices.
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Scientific sources for our caffeine calculator
U.S. Food and Drug Administration. (2018). Spilling the Beans: How Much Caffeine is Too Much?
FDA.govEuropean Food Safety Authority. (2015). Scientific Opinion on the Safety of Caffeine.
EFSA JournalTemple, J. L., Bernard, C., Lipshultz, S. E., Czachor, J. D., Westphal, J. A., & Mestre, M. A. (2017). The Safety of Ingested Caffeine: A Comprehensive Review.
Frontiers in PsychiatryOther helpful resources
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