WakeSharp · Free Tools
Caffeine Cutoff Calculator
Estimate caffeine remaining at bedtime using dose, timing and half-life. Explore earlier consumption without a guaranteed safe cutoff.
Your result
How it works
Remaining caffeine = dose × 0.5^(hours / half-life). Five hours is an illustration, not your measured metabolism. The cutoff leaves 25% of a dose, not a safe threshold. A bedtime earlier than consumption means the next day.
Questions
Are these tools free and private?
Yes. No account or payment is needed. Calculations run in your browser. Optional analytics never include your inputs or results.
Sources
www.cdc.govExplore another tool
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