toolsPulse tools
Caffeine half-life
How much caffeine might still be in you after N hours. A 5-hour half-life is a common textbook number — you are not a textbook.
Result
35 mg left
Uses a 5-hour half-life. People vary.
How to use
- 1Enter the dose (mg) if the tool asks, or the hours since coffee.
- 2Read the remaining estimate.
- 3Do not use this to ignore a cardiologist.
FAQ
- Pregnancy / meds?
- Limits change. This is a half-life sketch, not care.
- Energy drinks vs coffee?
- Type milligrams from the can if you have them.
- Do you keep my numbers?
- No. They stay in this tab until you refresh.
- Is this free?
- Yes. Ads may appear when you copy or run the main action.