Caffeine Half-Life
Estimate remaining caffeine over time.
CalcSimpler Examples
- 200 mg after 5 h ⇒ 100 mg
FAQ
What half-life is assumed?
The calculator uses an average caffeine half-life of about 5 hours for healthy adults.
Why might my caffeine level differ from the estimate?
Metabolism varies with age, liver function, pregnancy, medications, smoking, and genetics, so actual clearance can be faster or slower.
Can this tell me when to stop drinking coffee before bed?
It offers a rough guideline only. Many people avoid caffeine for at least six hours before sleep, but individual sensitivity differs.
Additional Information
- Real-world caffeine clearance varies widely with factors like age, liver function, medications, and pregnancy.
- Treat results as a general estimate; genetics, smoking, and regular consumption also influence how fast caffeine leaves the body.
CalcSimpler