Screen Time Calculator

The American Academy of Pediatrics dropped a single daily-hour limit in 2016 in favor of a quality-and-balance framework: screen time becomes a problem when it crowds out sleep, physical activity, school, social time, or in-person family interaction. For adults, the WHO guideline is that any sedentary behavior — including screen time — should be broken up with regular movement.

It counts toward your total daily hours and matters for eye strain, posture, and sleep. But work screen time and recreational screen time have different effects on wellbeing — research consistently shows that recreational social media use is more strongly linked to mood and sleep effects than equivalent hours of focused work. Both still benefit from regular breaks.

Three highest-leverage moves: (1) Set 'no phones' zones — the bedroom is the biggest single win for sleep. (2) Use a hardware solution where possible — a kitchen timer for breaks beats a screen-based timer. (3) Replace, don't restrict — add a competing activity (walk, hobby, conversation) in the time slot rather than just trying to avoid the screen.

Two ways: (1) Blue light from screens suppresses melatonin, delaying sleep onset — most pronounced in the 1–2 hours before bed. (2) Content effects — social media, news, and stimulating shows raise cortisol and alertness, which matters more than the light. The standard recommendation: no screens in the 30–60 minutes before sleep, and no screens in the bedroom overnight.

AAP guidelines: under 18 months, avoid screens except for video calls. 18–24 months, only high-quality programming co-viewed with a parent. Ages 2–5, no more than 1 hour/day. Ages 6+, consistent limits that don't crowd out sleep, exercise, or school. Adults have no formal guideline, but the WHO recommends breaking up sedentary behavior — including screen time — with regular movement.