What this calculator does — and what it doesn't
Type in your average daily screen time and the tool multiplies it out across a year: total hours, waking weeks (at 16-hour days), full work weeks, and roughly how many books' worth of reading that time represents. Three hours a day, for instance, is over 1,000 hours a year — several full weeks of your waking life.
That's the whole trick, and it's a modest one. The calculator makes no claim about whether your screen time is harming you. It converts a number you glance past every week into one big enough to actually feel. What you make of that feeling is the point.
Honest about the evidence
It would be easy to dress this up as a health warning. The evidence doesn't support that, and this site would rather tell you the truth.
The research on screen time and wellbeing is mixed and still emerging. The single biggest problem is that "screen time" is a blunt instrument. An hour spent video-calling a grandparent, navigating home, or reading something absorbing is not the same as an hour of doom-scrolling at 1 AM — yet a raw total counts them identically. When researchers look carefully, the association between total screen time and wellbeing turns out to be real but generally small, and highly dependent on what you're doing and why.12
The blue-light story is similarly overstated. Screens can push your bedtime later, but the evidence points more at the obvious mechanisms — engaging content keeps you alert, and the device keeps you up past when you meant to stop — than at blue light as a special villain. Studies of blue-light-blocking glasses find weak, inconsistent benefits.3 The reliable sleep cost of the phone in bed is simpler: it displaces sleep. You meant to stop at 11 and surfaced at 12:30.
So: no scare numbers here, no "screens are rotting your brain." Just a mirror.
The reflection value
If the evidence for harm is soft, why offer the tool at all? Because the number does one genuinely useful thing: it separates chosen time from autopilot time.
Most of us don't have a screen-time problem so much as an attention-leak problem. The time we'd defend — the calls, the map, the show we actually wanted, the group chat that's real friendship — is fine. The time that stings when we see the total is the other kind: the reflexive unlock at a red light, the scroll that starts as a break and ends as an hour, the anxious refresh that leaves us more wound up than before.
That second kind is worth naming plainly: it's load pretending to be rest. It looks like downtime and feels like downtime, but you get up from it depleted rather than restored. The calculator can't tell the two apart for you — only you can — but seeing the yearly figure is often enough to make you want to.
| Daily screen time | Roughly per year | About equal to |
|---|---|---|
| 1 h | ~365 h | ~9 full work weeks |
| 3 h | ~1,095 h | ~27 work weeks; ~180 books of reading time |
| 5 h | ~1,825 h | ~45 work weeks — nearly a working year |
Read the right-hand column not as a scold but as an option. That time isn't gone in principle — it's a budget, and some of it is reclaimable.
Where this fits the bigger picture
Anxious scrolling and stress tend to travel together, each feeding the other: you feel wound up, you reach for the phone to numb it, the feed serves up more to be wound up about, and the loop tightens. If your total is high and a good chunk of it is that anxious variety, the screen isn't the disease — it's the thermometer.
A few honest next steps, in rough order of leverage:
- Protect the last hour before bed. This is where the sleep cost is most real. Getting the phone out of the bedroom does more for your sleep than any blue-light filter — and if you want to make the recovered time count, the sleep cycle calculator will time it well.
- Treat the leaked time as reclaimable energy, not lost virtue. If your days feel like there's never enough of you to go around, the energy budget is a more useful frame than guilt — it turns "I wasted three hours" into "I have three hours to reallocate."
- When the scroll is anxiety-driven, address the anxiety. If you're refreshing to manage a worry, the worry timer gives the worry a proper appointment so it stops hijacking your thumb, and the stress check reads the load underneath it.
The one question worth asking
The calculator boils down to a single, narrow, answerable question — narrower than "is my phone bad for me," which no one can answer for you: how much of that time did I choose?
If the honest answer is "most of it," then enjoy your screens with a clear conscience; the yearly number is just interesting trivia. If the honest answer is "less than I'd like," you've found something real — not a moral failing, just a budget line quietly overspending itself. And unlike most of what this tool measures, that one is entirely yours to redraw.