Caffeine Half-Life Calculator
Calculate how much caffeine remains in your body after a given number of hours.
How to Use the Caffeine Half-Life Calculator
- Enter the required values into the input fields.
- Click the Calculate button to see the results.
- Review the output values and interpretations below.
クイックリファレンス
| 変換元 | 変換先 |
|---|---|
| Coffee (240 ml) | ~95 mg |
| Espresso (30 ml) | ~63 mg |
| Black tea (240 ml) | ~47 mg |
| Cola (355 ml) | ~34 mg |
| Energy drink | 80–150 mg |
使用例
- •Monitoring personal health metrics and tracking changes over time.
- •Supporting clinical decision-making with quick formula-based estimates.
- •Educational use for students learning health and fitness calculations.
計算式
Formula: Remaining = Dose × 0.5^(hours / 5). Caffeine half-life averages 5 hours in healthy adults.
よくある質問
What is caffeine's half-life?
Caffeine's half-life averages 5 hours in healthy adults. This means after 5 hours, half the caffeine is still in your system. It can range from 3-7 hours depending on genetics and other factors.
How much caffeine is in common drinks?
An 8 oz coffee has about 95 mg. Espresso shot: 63 mg. Black tea: 47 mg. Cola: 34 mg. Energy drink: 80-150 mg.
When should I stop drinking coffee?
To minimize sleep disruption, stop caffeine 8-10 hours before bedtime. At that point, about 75% of caffeine will have been eliminated.