Screen Time Calculator
Enter your average daily screen time to see how it adds up over a week, a month, a year, and a lifetime. Just an interesting stat, not a lecture.
Last updated
Why screen time adds up faster than you think
This calculator only needs one real input: your average hours per screen day, set with the slider from half an hour up to 14 hours. Everything else is that single number multiplied out across different calendar spans. If you also enter your current age, it adds a second projection: that same daily average carried forward to age 80, turned into an equivalent number of years. Age is optional because the weekly, monthly, and yearly totals are useful on their own without it.
The math behind the three main numbers is simple multiplication using standard calendar averages: your daily hours times 7 for a week, times 30.4 for a month, and times 365.25 for a year, which accounts for leap years. For example, at 4 hours a day, the weekly total is 28 hours, the monthly total is about 122 hours, and the yearly total comes out to 1,461 hours. Add an age of 30 and the calculator projects that same 4-hour daily average across the 50 remaining years to age 80: roughly 73,050 total hours, which works out to about 8.3 years once converted into full 24-hour days and years.
One thing worth understanding about that lifetime number: it converts your total hours into "years" by dividing by 24 hours a day, the same way you'd hear stats about people spending years of their life commuting or sleeping. It isn't saying you're awake and on a screen for 8.3 straight years, it's just expressing a large hour count as an equivalent number of full days and years so the scale is easier to picture. The daily average itself is also just an average, a weekday full of video calls looks nothing like a lazy Sunday, so treat the input as your best rough estimate rather than something you clocked to the minute.
Hour-to-year conversions use standard calendar averages (7 days a week, about 30.4 days a month, 365.25 days a year).
Frequently asked questions
How is this calculated?
It multiplies your daily average hours by 7 for a weekly total, by roughly 30.4 for a monthly total, and by 365.25 for a yearly total. If you provide your age, it also projects that same daily average forward to age 80 to estimate a lifetime total.
Is all screen time "bad"?
Not at all, this calculator doesn't judge what the time is spent on. Work, reading, video calls with family, and entertainment all count as screen time equally here. The number is just a neutral stat to help you see the total, not a verdict on how you use it.
Why does the calculator use 30.4 days for a month instead of 30?
365.25 days in a year, which already accounts for leap years, divided by 12 months averages out to about 30.4 days a month. Using a flat 30 would slightly understate the monthly total, especially across the many months with 31 days, so the calculator uses the more accurate calendar average instead.
Why does the lifetime projection stop at age 80?
80 is just used as a common, round reference point for a rough projection, not a personalized prediction based on your health or family history. If you want a different endpoint, multiply your yearly total by however many years you'd like to project instead of relying on the age field.
Does this track just my phone, or all my screens?
Neither, specifically. The calculator only asks for one average hours-per-day number and doesn't distinguish between phone, computer, TV, or tablet time. If you want a phone-only figure, use your phone's built-in screen time report as the input instead of your total across every device.
What if I don't know my exact daily average screen time?
Most phones already track this for you. Check your phone's built-in screen time or digital wellbeing report for a few recent days, average those daily totals, and enter that number. If you don't have access to that data, a rough honest estimate is still more useful than skipping the calculator, you can always come back and adjust it.
How much would cutting back actually save me?
Since every output scales directly with your daily hours, you can see the effect of cutting back by re-running the calculator with a lower number and comparing the yearly totals. Dropping from 4 hours a day to 3, for example, saves about 365 hours a year, roughly 15 full days, without needing any other math.
Cutting back on screen time but still staring at a screen most of the day? Blue light glasses like these are a simple, well-reviewed way to ease eye strain.
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