Habits & desk health
Screen time life calculator
Enter your daily screen hours and your age to see how much of the rest of your life that habit adds up to.
Use the daily average from your phone or computer screen-time report, and leave out hours you are paid to look at a screen.
How the screen time total is calculated
The calculator multiplies your daily screen hours by 365 to get hours per year, divides by 24 to express them as whole days, and then multiplies by the number of years left until the age you choose. The result in years is simply daily hours × years remaining ÷ 24, because a year of 24-hour days is 8,760 hours.
Worked example: 4 hours a day at age 30, counted to age 80. That is 4 × 365 = 1,460 hours a year, or 60.8 full days. Over the 50 years ahead it reaches 73,000 hours, which is 3,042 days or 8.3 years. Measured against a 16-hour waking day, four hours is a quarter of all the time you are awake. The book figure assumes a 90,000-word novel read at about 250 words per minute, which takes roughly six hours, so 1,460 hours would cover around 243 novels a year.
| Daily screen time | Hours per year | Days per year | Years from age 30 to 80 |
|---|---|---|---|
| 1 h | 365 | 15.2 | 2.1 |
| 2 h | 730 | 30.4 | 4.2 |
| 3 h | 1,095 | 45.6 | 6.3 |
| 4 h | 1,460 | 60.8 | 8.3 |
| 6 h | 2,190 | 91.3 | 12.5 |
| 8 h | 2,920 | 121.7 | 16.7 |
Reading the result honestly
The total is calendar time, not a verdict. Video calls with family, an online course or a film you love are screen hours too, and nobody should aim to wipe them out. The number is most useful for the part of your day that happens by reflex: unlocking the phone in a queue, scrolling in bed, opening a feed while a page loads. Your phone's weekly report usually breaks usage down by app, so you can see which share is deliberate and which is drift.
Two common mistakes inflate or shrink the figure. First, entering work hours: if your job keeps you at a monitor for eight hours, count only leisure screens here. Second, using one unusually heavy or light day; take the seven-day average instead. Because the result scales linearly, small changes matter: trimming 30 minutes a day saves about 182 hours a year, roughly the length of a month of full-time work. Pick one concrete swap, such as charging the phone outside the bedroom, and recalculate after a few weeks.
Frequently asked questions
How many years of my life will I spend on my phone?
Multiply your daily phone hours by the years you have left and divide by 24. At 3 hours a day for 50 years that is 3 × 50 ÷ 24 = 6.25 years of round-the-clock time.
Should I count screen time at work?
Usually not. The point is to see discretionary time you could redirect, so leave out paid hours at a computer and count phone, TV, gaming and personal browsing.
Is 4 hours of screen time a day a lot?
Four hours is a quarter of a 16-hour waking day and adds up to about 61 full days a year. Whether that is too much depends on what the hours replace, such as sleep, exercise or time with people.