Caffeine Cutoff Calculator
Last time to drink coffee without hurting sleep.
Your result
Caffeine has a half-life of about 5 hours. The plan assumes under 25 mg remaining at bedtime. Half-life varies with genetics, pregnancy and medication.
Medical disclaimer: This tool is for education and is not medical advice. Read more.
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Learn more
Caffeine and Sleep: When to Stop
Caffeine lingers in the body longer than most people think.
Sleep & Mental WellbeingSleep Cycles and How to Wake Up Refreshed
Why timing your alarm around 90-minute cycles can help.
Sleep & Mental WellbeingHow Much Sleep Do Adults Need?
Seven to nine hours for most adults, and the cost of shortchanging it.
Frequently asked questions
What does the Caffeine Cutoff Calculator do?
Last time to drink coffee without hurting sleep. Enter your values and the result and chart update instantly.
How accurate is it?
It uses published, widely used formulas. Results are estimates for education and planning, not a diagnosis. Talk to a qualified clinician about decisions affecting your health.
Is my information stored or shared?
No. All calculations run in your browser and nothing you type is sent to a server or saved.
What can I search to find this tool?
People find it by searching for: when to stop drinking coffee; caffeine and sleep; last coffee of the day.