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Coffee vs Sleep Calculator

Is that coffee worth the sleep you lose?

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.

  1. 1Filter coffee: ~95mg caffeine; espresso: ~63mg; latte: ~63mg
  2. 2Daily safe limit: ~400mg (~4 standard cups)
  3. 3Caffeine half-life: 5–6 hours
  4. 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
DrinkCaffeine
Espresso (30mL)~63mg
Filter coffee (240mL)~95mg
Energy drink (250mL)~80mg
Green tea (240mL)~28mg
Cola can (355mL)~34mg
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