Enter the milligrams in the drink. The result is how long a 5 hour half-life takes to leave less than 50 mg in the estimate. Your own half-life can be shorter or longer.
| 95 mg (about 8 oz coffee) | 4.6 hours |
| 200 mg | 10.0 hours |
| 400 mg | 15.0 hours |
Each 5 hours, the estimate cuts the remaining caffeine in half. The page solves for how many of those cuts it takes to get from your dose to under 50 mg. A 200 mg dose is about 10 hours on this model. Count back from the time you want to be under that line.