Screen Time Reality Check
Read this before you start
This is arithmetic, not a verdict. It takes the number you enter and multiplies it out over a year, using two plain averages: a 16 hour waking day, and about 5 hours to read an average 300 page book. It says nothing about whether your own screen time is good or bad, only what a year of it adds up to.
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Where do these numbers come from?
A waking day is treated as 16 hours, roughly 24 hours minus 8 for sleep, so "91 waking days a year" means 91 full 16 hour days, not calendar days. A book is treated as about 5 hours: an average reader covers roughly a page a minute, and 300 pages is a typical book length. Neither figure is a scientific constant. They are the same round, defensible averages you would use for any back of envelope estimate, stated plainly so you can judge them for yourself.
Why isn't there a score or a percentile?
Because there is no population data behind this calculator to compare you against, and inventing a benchmark would be worse than showing none at all. This page only ever shows you your own number, multiplied out. It never tells you where you rank against anyone else.
Does anything I type here get saved or sent anywhere?
No. The whole calculation runs in your browser in plain JavaScript. This page makes no network request of any kind while you use it, and writes nothing to storage. Refresh the page and the number resets to the default.