Caffeine Half-Life Calculator: Maximize Your Night-Shift Energy Without Killing Your Post-Shift Sleep
Ever wonder why that 2 AM coffee sometimes wrecks your morning sleep? Our Caffeine Half-Life Calculator helps you pinpoint the best times (and doses) to boost alertness without sabotaging your daytime rest. Drawing on NASA’s fatigue research and Navy SEAL protocols, this calculator delivers precise, science-backed recommendations so you can stay focused through the night and sleep soundly once your shift is done.
Caffeine Half-Life Calculator
Optimize your caffeine intake for maximum alertness—backed by real shift-work data
Quick Start: Enter your weight, pick lbs or kg, and set your shift times.
We'll suggest the best caffeine doses—plus coffee cup equivalents.
We'll convert if you pick lbs
Lbs or Kg
For night shifts, typical start might be 18:00 or 20:00
E.g., 06:00 for a 12-hr night shift
We'll scale your mg dosage accordingly
Recommended Caffeine Times & Doses
0 mg @ 00:00
0 mg @ 00:00
How We Calculate Your Caffeine Times
-
Start-of-Shift Dose (~1.4 mg/kg): Boost alertness early without overshooting bedtime
-
Mid-Shift Dose (~0.7 mg/kg): Maintains focus around 3 AM slump, but avoids carryover into morning
-
Half-Life Check: We ensure last dose is far enough from Shift End to allow normal daytime sleep
Research Behind This Calculator:
1)
Navy SEAL night ops: 1.4mg/kg at start, 0.7mg/kg mid-shift to preserve performance
2)
Circadian-based caffeine timing reduces crash risk (NASA Fatigue Study)
3)
Excess caffeine near shift end disrupts melatonin (Circadian Lab, 2023)
Learn More in Our Night Shift Survival Guide
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