Screen time over a lifetime

What the number means

Daily hours feel small and lifetime hours feel large, and neither feeling is a measurement. The page does the multiplication so you can see the other side of the same habit: the total number of hours, the number of full days, how many years of working life it matches and what fraction of your waking time it takes. It says nothing about whether those hours are well spent. A video call with family, a navigation app and an endless feed are all counted the same way; only you can tell them apart.

The method

Years ahead = the age you count to − your age. Hours = screen hours a day × 365.25 × years ahead. Years of waking life = years ahead × screen hours ÷ waking hours (our derivation: if screens take 5 of 15 waking hours, they take a third of the waking years). Share of waking hours = screen hours ÷ waking hours. Full-time work years = total hours ÷ 2,080, a standard 40-hour, 52-week working year. Hours back = the daily cut × 365.25 × years ahead.

Worked example

5 hours a day, 15 waking hours, from 35 to 80. 45 years × 1,826 hours a year gives 82,181 hours, which is 3,424 days of 24 hours or 39.5 full-time working years. Screens take 33.3% of waking hours, so 15.0 of the 28.1 years of waking life in that period. One hour a day less would return 16,436 hours. The figures come from the same function as the calculator.

Limits of this method

The result assumes the same number of hours every year from now until the end age. In life, screen use changes: it rises and falls with work, school, health and habits, and today's devices may not be the ones of the future. Averages from surveys are not a guide to you: the American Time Use Survey counts only the main activity at a time and does not give a single figure for all screens, and the Common Sense Census covers ages 8 to 18 in 2021 and excludes schoolwork. The share of waking hours is also a simplification, since screens are often used while doing something else, such as cooking or commuting, so adding them to other activities can pass 100%.

How much of my life will I spend on screens?

It follows from three numbers you choose. Example values, not averages: 5 hours of screen time a day, 15 waking hours, from age 35 to 80. That is 1,826 hours a year and 82,181 hours over 45 years, or 3,424 full 24-hour days. Of the 28.1 years of waking time in that stretch, 15.0 years would be spent on screens: 33.3% of waking hours. With 3 hours a day the figure is 9.0 years. The result describes arithmetic, not a verdict; what counts as worthwhile screen time is up to you.

Does 'screen time' include work?

On this page it is whatever you enter. Many people use screens for work, study, calls, banking, maps and reading as well as entertainment, and those hours add up the same way. If you want to look only at leisure screens, enter just those hours. If you want the whole picture, include everything. The tool cannot tell the difference between a spreadsheet and a video, and it does not rate either.

What do surveys say about how much time people spend on screens?

We quote only sources we could check. In the Bureau of Labor Statistics American Time Use Survey for 2025, Americans aged 15 and over spent on average 2.61 hours a day watching television, counting only the main activity of the day, and slept 9.03 hours, including naps. That survey does not measure phone or computer time in a single figure, so it does not give a total for screens. For young people, the Common Sense Census (2021) reported 5 hours 33 minutes a day of entertainment screen media for ages 8 to 12 and 8 hours 39 minutes for ages 13 to 18, excluding school and homework, up from 4:44 and 7:22 in 2019. These are survey averages: individual use varies widely, and a single average says little about any one person.

How do I choose waking hours?

Waking hours are 24 minus the time you sleep. In the 2025 American Time Use Survey, average sleep (including naps) was 9.03 hours a day, which leaves about 15.0 hours; the form starts at 15 on that basis, which is our arithmetic. Your own sleep may be shorter or longer, and children sleep more. Waking hours matter because they turn a count of hours into a share of the day you are awake and able to choose.

What do pediatricians advise for children?

The American Academy of Pediatrics published a policy statement, Digital Ecosystems, Children, and Adolescents, in Pediatrics in February 2026. Press coverage and the AAP's release describe it as moving away from a fixed daily limit — the 2016 advice had suggested no more than two hours of screen time a day for children — toward looking at the design of platforms and at what a child is doing and what it displaces, such as sleep, movement and time with family; it encourages screen-free times and places such as dinner and the car. We have not read the full text, so check the AAP's own page for age-specific advice. For a child, the form works the same way: with 5.55 hours a day from age 10 to 80 it gives 27.8 years of waking life.

What does cutting an hour a day give back?

Enter the hours in the last field. In the example, one hour a day less is 16,436 hours over the 45 years, about 411 40-hour work weeks or 3.0 years of waking life. That is arithmetic about time, not advice to cut. It does not say what you would do instead, or whether the time would be better.

Why does the page ask for the age I count to?

Because the calculation needs a number of remaining years, and the page does not predict how long you will live. Enter the age you want to plan for, such as 80 or 90. Nobody knows their own lifespan, so try a few; the result scales in proportion to the number of years.

Informational arithmetic only — not medical, psychological or parenting advice. Sources, checked October 28, 2026: U.S. Bureau of Labor Statistics, American Time Use Survey — 2025 results, Table 1 (sleeping 9.03 hours, watching television 2.61 hours a day, primary activities only); Common Sense Media, Kids' media use accelerated rapidly during the pandemic (Common Sense Census: Media Use by Tweens and Teens, 2021); American Academy of Pediatrics, news release of January 20, 2026 on the policy statement Digital Ecosystems, Children, and Adolescents (Pediatrics, February 2026). Related: the sleep calculator, sleep needs by age calculator, age calculator, reading time calculator and hours calculator. How we check our calculators.