Caffeine Half-Life Calculator

Estimates caffeine remaining over time.

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Result

Caffeine remaining

115 mg

At bedtime (8h later est.)

38 mg (est. 8h later)

Caffeine Half-Life Calculator — How It Works

Estimates caffeine remaining over time. Try the Caffeine Half-Life Calculator — instant results in your browser.

Enter your measurements or activity details. Results update live. These are estimates for planning — not medical advice.

Yes — runs locally in your browser.

Use results for general fitness planning. Consult a healthcare professional for medical decisions.