Caffeine Half-Life Calculator
Model caffeine decay based on CYP1A2 genetics and lifestyle factors.
Caffeine Half-Life at a glance
This page computes the measurement directly: instead of quoting a population average, the Caffeine Half-Life asks for your measurements and computes the index for your own body.
Model caffeine decay based on CYP1A2 genetics and lifestyle factors.
The page is written for people who re-measure over time: the result fits the same progress rhythm Macrition uses for weight and waist, so the number stays comparable with everything else you record.
About Caffeine Half-Life Calculator
Model caffeine decay based on CYP1A2 genetics and lifestyle factors.
This lifestyle calculator helps you assess and track the non-diet factors that drive long-term health. Sleep, stress, hydration, physical activity, and circadian alignment are equally important as nutrition, sometimes more so. Use this tool to identify areas for improvement and track progress over time.
Why lifestyle matters
Research consistently shows that lifestyle factors account for more variance in health outcomes than genetics. WHO Europe's synthesis of health-determinant research attributes roughly 36% of health outcomes to health behaviours, 24% to social circumstances, 22% to genetics, 11% to medical care, and 7% to the physical environment. Behaviour is the single largest share, and unlike genetics or circumstances it is the part you can act on today. Optimizing sleep, stress, hydration, and activity can dramatically improve metabolic health, cognitive performance, and longevity.
Evidence-based interventions
Each lifestyle factor has a large body of evidence supporting specific targets: 7-9 hours of sleep, 150 minutes of weekly exercise, 30 mL/kg of water, stress management practices, and consistent sleep/wake times. Use the related tools to dive deeper into each area.
Formula sources, population limits, and references for this lifestyle calculator are documented in our public methodology. Read the methodology · Medical disclaimer