Coffee vs Sleep Calculator
Coffees per Day
Hours of Sleep
✓Energy Analysis
Daily Caffeine (mg)
285
Sleep Deficit
2.0h short
Moderate sleep deficit — limit to 1-2 coffees before noon
Safe caffeine limit: ~400mg/day (4 cups). Caffeine half-life: ~5-6 hours.
A coffee vs sleep calculator shows whether you are using caffeine to mask a sleep deficit — common but unsustainable long-term. Caffeine improves alertness but cannot fully replace lost sleep.
- 1Filter coffee: ~95mg caffeine; espresso: ~63mg; latte: ~63mg
- 2Daily safe limit: ~400mg (~4 standard cups)
- 3Caffeine half-life: 5–6 hours
- 4Sleep debt > 2 hours is not safely compensated by caffeine
4 coffees/day, 5.5 hours sleep=380mg caffeine (near limit); 2.5h sleep deficit — review sleep habits
| Drink | Caffeine |
|---|---|
| Espresso (30mL) | ~63mg |
| Filter coffee (240mL) | ~95mg |
| Energy drink (250mL) | ~80mg |
| Green tea (240mL) | ~28mg |
| Cola can (355mL) | ~34mg |
References
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