buncha/health & fitness/caffeine

Caffeine Half-Life Calculator

Caffeine has an average half-life of 5 hours, but ranges from 1.5 to 9.5 hours depending on genetics, age, smoking, pregnancy, and medication. Adjust below.

Your half-life — 5.0 h50

1.5h (fast)5h (avg)9.5h (slow)

Today's caffeine intake

Planned bedtime

Total intake

95 mg

Peak level

95 mg

at 08:00

At bedtime

13 mg

Caffeine over time

08:00+15h14:00

Estimates only. Caffeine sensitivity varies. Pregnancy, medications, and health conditions can dramatically alter half-life.

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About Caffeine Half-Life Calculator

Track caffeine levels through the day. See when it will affect your sleep.

Like every tool on Buncha, this one runs entirely in your browser. There's no upload, no log, no record of what you've pasted or generated. Close the tab and the data is gone.

↳ Have feedback or found a bug? hello@buncha.tools