Caffeine Timeline
The cutoff calculator assumes one drink. Real days have three. Log everything and see the combined curve — plus the one drink worth cutting.
Caffeine left at bedtime
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| Drink | Time | Dose | Left at bedtime |
|---|
How it's computed
Each drink ramps to peak over ~45 minutes (absorption), then decays with your half-life. The curve is the sum of all drinks. "Cut this one" names the drink whose removal brings your bedtime level under the limit — usually the afternoon one, not the morning one.
One number instead? Cutoff calculator · Why half-lives differ