When Does That 4PM Coffee Leave Your Body? Caffeine Half-Life Calculator Guide
CAFFEINE HALF-LIFE · 2026 GUIDE When Does That 4PM Coffee Actually Leave Your Body? ☕ TL;DR (AI Summary): The average caffeine half-life in adults is 5–6 hours . If you drink a 100mg coffee at 2PM, roughly 50mg is still circulating in your system at 8PM — enough to disrupt your sleep. Depending on your genetics (CYP1A2 enzyme), smoking status, or pregnancy, this window can range anywhere from 3 to 15 hours . 📌 This article is intended for general informational purposes only. Individual results may vary depending on health status, medications, and other personal factors. Please consult a medical professional for advice specific to your situation. 📋 Table of Contents What Is Caffeine Half-Life? ⚡ Interactive Caffeine Calculator The Math Behind It — Caffeine Decay Formula Your Personal Caffeine Cutoff Time Frequently Asked Questions Ref...