0mg
of caffeine in your blood right now
Safe by
--
At bedtime
0 mg
Today
0 mg
of 400 mg
Your caffeine curve
Your levelSleep safe lineBedtime
Log a drink
Dose log
Tap a dose to edit it. Done ends a drink you are still sipping.
Nothing logged in the last 48 hours.
A planning estimate, not medical advice. It assumes caffeine absorbs over about an hour and then fades at a steady half life. Your real rate varies with genetics, medication, pregnancy, and liver health.