What is the half-life of caffeine?

The half-life of caffeine is about 5-7 hours. That means, if you drink 200 mg of coffee at 2 in the afternoon, 100 mg of it is still active in your body by 7-9 at night.

수면관리

커피와 수면

심야 커피가 어떻게 잠을 방해하는지 알아보세요

Medically Reviewed:

Dr. Priya Sammani, MBBS, PG Dip. FM

Updated on: April 2026

❓ Frequently Asked Questions (FAQ)

카페인의 반감기는 얼마나 됩니까?

카페인의 반감기는 약 5~7시간이다. 즉, 오후 2시에 200mg의 커피를 마셨다면 밤 7~9시까지 100mg의 커피가 신체에서 여전히 활동한다는 의미입니다.

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Medical Disclaimer: These calculators are provided for educational purposes only and are not a substitute for professional medical advice. Always consult a qualified physician regarding any health concerns..