One life · measured in years, not sessions
How many years of your life
belong to a screen?
The average person is now on screens 6 h 40 m a day — American teenagers, about 8 h 39 m of entertainment screen use alone. Set your numbers. Each square below is one year of a long life.
Assumes a life of 81 years and 16.5 waking hours a day. Full math on the screen-time calculator.
This is now a health story, not a lifestyle story
Screens are no longer just an attention problem. Half the world is projected to be myopic (nearsighted) by 2050 — about 5 billion people — and in parts of East Asia 8 or 9 of every 10 young adults already are. The strongest protective factor found in randomized trials isn't an app or a filter. It's two hours a day outdoors, in daylight, especially for children.
The myopia epidemic
What the numbers actually show, study by study — and why the curve bent after screens arrived.
Read the evidence →The two-hour outdoor rule
The one intervention with randomized-trial support, and how real families actually fit it in.
See how it works →Tools
Small, honest calculators. They run in your browser — nothing you type leaves this page.
Start tonight
- Turn your phone gray — the two-minute change that makes feeds boring.
- Print a family screen agreement — one page, signed by everyone, stuck on the fridge.
- Put friction in front of the apps that eat your evenings.
- Considering a bigger step? The honest guide to dumbphones.
The goal was never zero screens. It's screens that answer to you.