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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.

公式

Caffeine remaining = Initial dose × (1/2)^(Hours / Half-life) | Recommended cutoff: 400 mg/day max

ステップバイステップガイド

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

解いた例

入力

4 coffees/day, 5.5 hours sleep

結果

380mg caffeine (near limit); 2.5h sleep deficit — review sleep habits

よくある質問

What is Coffee Vs Sleep?

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

How accurate is the Coffee Vs Sleep calculator?

The calculator uses the standard published formula for coffee vs sleep. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Coffee Vs Sleep calculator use?

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the Coffee Vs Sleep calculator use?

The calculator applies the standard formula for this type of calculation. See the 'How It Works' steps above for the detailed formula breakdown.

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