Jet Lag Calculator
Light exposure timing for jet lag recovery based on time zones crossed.
Jet Lag at a glance
Light exposure timing for jet lag recovery based on time zones crossed. If you log meals, this is the companion number: it uses the same units and daily framing as the diary, which makes comparing your intake against the target a one-glance check rather than a conversion exercise.
About Jet Lag Calculator
Light exposure timing for jet lag recovery based on time zones crossed.
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