The average adult spends 6–7 hours per day on screens. For teenagers it's even higher. While not all screen time is harmful, excessive use is linked to sleep disruption, eye strain, reduced focus, and less time for physical activity and face-to-face connection.
According to various studies, the average adult spends 6-10 hours per day on screens, including smartphones, computers, and TVs. Teenagers spend an average of 7-8 hours on screens (excluding school-related use). These figures have increased significantly since smartphones became widespread.
Extended screen time can cause digital eye strain, also called Computer Vision Syndrome. Symptoms include dry eyes, headaches, blurred vision, and neck pain. The 20-20-20 rule helps: every 20 minutes, look at something 20 feet away for 20 seconds. Blue light filter glasses and screen dimming may also reduce strain.
There is no universally agreed maximum for adults, unlike children (the American Academy of Pediatrics recommends limiting recreational screen time for children). For adults, the key factors are: is it impacting sleep? Is it replacing physical activity, face-to-face socialising, or productivity? Quality of screen time matters as much as quantity.
The blue light emitted by screens suppresses melatonin production, making it harder to fall asleep. Using screens within 1-2 hours of bedtime can delay sleep onset and reduce sleep quality. Most health experts recommend avoiding bright screens 30-60 minutes before bed and using night mode or blue light filters in the evening.
Multiply your daily screen hours by 365 for annual hours, then by your expected remaining years of life. This calculator does it automatically. For perspective: 6 hours per day = 2,190 hours per year = 91 days per year spent looking at screens.