Screen Time & Scroll Calculator
How far do you scroll each day? Convert your screen time into a marathon-long journey or see how many full days you spend on your phone each year.
Size My Screen Time & Scroll
(Global Avg: 3h 46m per day)
Your Habit Scale
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The Science Behind It
Excessive screen time is linked to a range of health outcomes, from digital eye strain and sleep disruption to psychological effects and metabolic risk. This calculator contextualizes your usage against data from peer-reviewed studies and public health guidelines to help you make informed decisions.
1. Guidelines vs. Reality
Health bodies like the World Health Organization (WHO) and the Canadian Society for Exercise Physiology (CSEP) have established clear guidelines for daily screen time, especially for children and adolescents, to promote healthy development. However, population-level data shows that average usage often exceeds these recommendations by a significant margin. Our analysis charts highlight this gap.
2. Melatonin Suppression & Sleep
Evening exposure to blue-enriched light from screens suppresses the sleep-promoting hormone melatonin, which can delay sleep onset. Using devices within an hour of bedtime is a key contributor to "social jetlag," where your biological clock becomes misaligned with your social schedule.
3. Psychological Well-Being
High total screen time, particularly on social media, correlates with increased symptoms of anxiety and depression in both adolescents and adults. Longitudinal studies indicate that each additional hour of daily use can increase the odds of depressive symptoms by around 10%.
4. Physical Inactivity & Metabolic Risk
Sedentary screen time displaces physical activity, contributing to cardiometabolic risk factors. Meta-analyses show that every two-hour increase in daily recreational screen time is associated with a 6% higher risk of type 2 diabetes and cardiovascular events.
Sources:
- World Health Organization - Guidelines on physical activity, sedentary behaviour and sleep for children under 5 years of age.
- Rideout & Robb 2020 - Objectively measured infant and toddler screen time.
- Canadian 24-Hour Movement Guidelines (CSEP).
- DataReportal Digital 2025: Global Overview Report.
- Exploding Topics - Time Spent Using Smartphones (2025 Statistics).
- Common Sense Census 2019 (via ABC News).
- Pediatrics (2020) - Young Children’s Use of Smartphones and Tablets.