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.
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