Loading...
Track daily caffeine from beverages and foods. Compare against FDA limits with metabolism timeline.
A caffeine intake calculator tracks daily caffeine consumption from beverages and foods, comparing totals against the FDA-recommended 400mg daily limit for healthy adults.
Estimated clearance time: ~11 hours
| Beverage | Caffeine |
|---|---|
| Drip Coffee (8 oz) | 95 mg |
| Espresso (1 shot) | 63 mg |
| Cold Brew (8 oz) | 200 mg |
| Black Tea (8 oz) | 47 mg |
| Green Tea (8 oz) | 28 mg |
| Energy Drink (8 oz) | 80 mg |
| Energy Drink (16 oz) | 160 mg |
| Cola (12 oz) | 34 mg |
| Diet Cola (12 oz) | 46 mg |
| Dark Chocolate (1 oz) | 23 mg |
| Matcha (8 oz) | 70 mg |
| Decaf Coffee (8 oz) | 5 mg |
| Hours After | Remaining |
|---|---|
| 0 hr | 190 mg |
| 5.7 hr | 95 mg |
| 11.4 hr | 48 mg |
| 17.1 hr | 24 mg |
| 22.8 hr | 12 mg |
Formula
Remaining Caffeine = Initial Dose × (0.5)^(Hours ÷ Half-Life)Initial Dose = Total caffeine consumed in milligrams
Half-Life = Average 5.7 hours for healthy adults
Hours = Time elapsed since consumption
Worked Example
2 cups of drip coffee (190mg total)
Did you know? According to the FDA, about 80% of U.S. adults consume caffeine daily, with an average intake of approximately 200mg — equivalent to two 8-oz cups of coffee (source: FDA).
Sources
Calculate ABV from original and final gravity. Includes beer and wine style references.
Find substitutions for common baking ingredients with adjusted quantities and texture notes.
Calculate bread ingredient weights from baker's percentages with preset recipe profiles.
Adjust canning time and pressure for your elevation with USDA-based correction tables.
Convert between cups, tablespoons, teaspoons, ml, and more for cooking and baking.
Temperature-adjusted fermentation times with countdown timer for bread, yogurt, and more.