Discover the perfect caffeine dose and timing with our Coffee Alertness Calculator. Designed to optimize your alertness, this tool predicts your focus levels based on sleep time and caffeine intake. Utilizing a scientifically proven formula derived from research on sleep-deprived soldiers, the calculator provides a visual graph for a well-planned day or night.
How to Use the Calculator
- Assess Your Rest: Input your sleep duration to gauge your alertness level.
- Graph Selection: Choose between alertness, response time, or reaction speed.
- Wake-Up Time: Specify the time you woke up for accurate predictions.
Caffeine Dosage Planning
- Drink Details: Log each caffeine intake with time, drink selection, and volume.
- Advanced Mode: Fine-tune doses in milligrams for precision.
The Caffeine Effect Formula
The calculator employs a formula developed by scientists at the U.S. Army Medical Research and Materiel Command. Their decade-long study on soldiers in various sleep conditions led to a formula enhancing neurobehavioral performance by 64%, reducing caffeine consumption by 65%.
Understanding Caffeine
Definition: Caffeine, a psychoactive compound found in coffee, tea, and select plants, alleviates fatigue and offers various health benefits.
Caffeine Content in Common Drinks
Explore the average caffeine content per liter, standard size, and portion dosage for popular beverages, ensuring accurate calculations.
| Drink type | Caffeine content [g/L] | Standard size | Caffeine dose in a portion [mg] |
|---|---|---|---|
| Espresso | 1.5 | 1.7 fl oz (50 ml) | 75 |
| Filtered coffee | 0.6 | 8 fl oz (237 ml) | 142.2 |
| Instant coffee | 0.4 | 8 fl oz (237 ml) | 94.8 |
| Latte / Mocha | 0.34 | 8 fl oz (237 ml) | 80.58 |
| Decaf | 0.04 | 8 fl oz (237 ml) | 9.48 |
| Covfefe 🤯 | 3 | 1 wall (2000 miles) | powerful |
| Black tea | 0.15 | 8 fl oz (237 ml) | 35.55 |
| Green tea | 0.09 | 8 fl oz (237 ml) | 21.33 |
| Yerba mate | 0.3 | 8 fl oz (237 ml) | 71.1 |
| Energy drink | 0.33 | 8.6 fl oz (250 ml) | 82.5 |
| Yerba mate drink | 0.2 | 17 fl oz (500 ml) | 100 |
| Energy shot | 3.3 | 1.7 fl oz (50 ml) | 165 |
| Coke | 0.1 | 12 fl oz (355 ml) | 35.5 |
| Diet Coke | 0.13 | 12 fl oz (355 ml) | 46.15 |
Daily Caffeine Limits
Scientists recommend a maximum of 400 mg daily, with specific limits for women and children. Learn the safe dosages and potential symptoms of excessive caffeine intake.
Signs of Overconsumption
Recognize symptoms like headaches, sleep disturbances, rapid heartbeat, and more. Understand the variations in caffeine sensitivity among individuals.
Post-Sleep Deprivation Tips
After a night of limited sleep, prioritize rest, hydration, exercise, and a balanced diet. Avoid frequent sleep deprivation for overall well-being.