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Lifestyle

Screen Time Impact Calculator

Estimate health effects of daily screen time on sleep, eyes, and metabolism.

Screen Time Impact at a glance

This page computes the measurement directly: instead of quoting a population average, the Screen Time Impact asks for your measurements and computes the index for your own body.

Estimate health effects of daily screen time on sleep, eyes, and metabolism.

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.

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Screen Time Impact Calculator

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About Screen Time Impact Calculator

Estimate health effects of daily screen time on sleep, eyes, and metabolism.

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.

Editorial and formula review
Formulas verified against published peer-reviewed sources Last verified

Formula sources, population limits, and references for this lifestyle calculator are documented in our public methodology. Read the methodology · Medical disclaimer

Frequently asked questions

Use lifestyle calculators weekly to track trends. Single measurements are less useful than patterns over time.
Sometimes, but only under medical supervision. Never stop prescribed medication without consulting your healthcare provider.
Sleep has the broadest impact, it affects metabolism, immunity, cognition, and mental health. If you can only optimize one thing, start with sleep.