About Caffeine Calculator
Track daily caffeine consumption against FDA guidelines and calculate half-life decay.. Designed for accurate, instantaneous calculations with zero wait time.
Formula
Total Caffeine = Sum of Beverage Caffeine (FDA Limit: 400 mg/day, Half-life: ~5 hours)
Example Calculation
2 cups of brewed coffee (190mg) represent 48% of the recommended 400mg daily ceiling.
How to Use
- Enter your values into the form fields above.
- The calculation updates immediately in real time.
- Inspect the main summary and secondary breakdowns below.