Computer screen time is measured in several different ways: all-device weekday use, entertainment media, digital learning, pre-bed exposure and directly measured smartphone use. The statistics below make those definitions, populations, periods and geographic limits explicit.
Key Computer Screen Time Statistics
The most broadly useful figures are:
- In July 2021–December 2023, 50.4% of U.S. teenagers ages 12–17 reported at least 4 hours of daily screen time on most weekdays.
- In July 2021–December 2023, 56.2% of U.S. teenagers ages 15–17 reported at least 4 hours of daily screen time.
- In July 2021–December 2023, 44.4% of U.S. teenagers ages 12–14 reported at least 4 hours of daily screen time.
- In July 2021–December 2023, 60.4% of non-Hispanic Black U.S. teenagers ages 12–17 reported at least 4 hours of daily screen time.
- In July 2021–December 2023, 51.7% of U.S. teenagers in families below 200% of the federal poverty level reported at least 4 hours daily.
- In July 2021–December 2023, 70.4% of U.S. teenagers with no more than 2 hours of screen time reported 60 minutes of physical activity most days or every day.
- In July 2021–December 2023, 54.4% of U.S. teenagers with at least 4 hours of screen time reported 60 minutes of physical activity most days or every day.
- In 2021, U.S. children ages 8–12 averaged 5 hours 33 minutes of total screen use per day.
- In 2021, U.S. teenagers ages 13–18 averaged 8 hours 39 minutes of total screen use per day.
- From 2019 to 2021, teen total screen use rose from 7 hours 22 minutes to 8 hours 39 minutes per day in the United States.
- In 2021, 41% of U.S. teens ages 13–18 reported more than 8 hours of screen media per day.
- In PISA 2022, 15-year-olds across OECD countries reported 2.0 hours per school day using digital devices for learning at school.
- In PISA 2022, 55% of students across OECD countries used digital tools for learning at least 1 hour per day at school.
- In a 2018 U.S. and Puerto Rico adult survey, 41.2% of adults ages 27–85 reported screen use in the hour before bed.
- In the same 2018 adult survey, daily pre-bed screen use was associated with 7.64 fewer workday sleep minutes.
- In a 30-day Health eHeart Study measurement period, median adult smartphone screen time was 38.4 hours.
- A meta-analysis of 26 studies involving 19,417 university students found pooled odds of digital eye strain were 2.06 times higher with greater screen exposure.
- WHO’s 2019 guidance recommends no sedentary screen time for infants under 1 year.
Contents
- Computer screen time statistics by age and daily-use level
- Teen computer screen time data by demographic group
- Children’s screen time trends and activity breakdowns
- Digital screen time for learning and leisure
- Computer screen time, sleep and physical activity
- Screen time, eye strain and wellbeing measurements
Computer Screen Time Statistics by Age and Daily-Use Level
The CDC/NCHS measure asks U.S. teenagers about time in front of a television, computer, cellphone or other electronic device on most weekdays, excluding schoolwork. It is self-reported all-device screen time, so it should not be read as computer-monitor-only use.
| Daily screen-time response | U.S. teenagers ages 12–17, July 2021–December 2023 |
|---|---|
| At least 4 hours | 50.4% |
| Exactly 3 hours | 22.8% |
| Exactly 2 hours | 17.8% |
| Exactly 1 hour | 6.1% |
| Less than 1 hour | 3.0% |
Source: CDC/NCHS, Daily Screen Time Among Teenagers: United States, July 2021–December 2023.
Age differences were visible in the same survey: 44.4% of 12–14-year-olds and 56.2% of 15–17-year-olds reported at least 4 hours daily. The question excludes schoolwork, and the device mix includes phones, televisions and other screens.
Teen Computer Screen Time Data by Demographic Group
The CDC/NCHS results also show variation by race and ethnicity, household income, parental education and county classification. These are descriptive survey comparisons, not explanations of why the groups differ.
| U.S. teen group, ages 12–17 | At least 4 hours daily, July 2021–December 2023 |
|---|---|
| Non-Hispanic Black | 60.4% |
| Hispanic | 47.2% |
| Non-Hispanic White | 47.3% |
| Family below 200% of federal poverty level | 51.7% |
| Family at or above 200% of federal poverty level | 49.6% |
| Highest-educated parent: some college or less | 55.0% |
| Highest-educated parent: college degree or higher | 45.2% |
| Metropolitan county | 51.4% |
| Nonmetropolitan county | 43.3% |
Source: CDC/NCHS, Daily Screen Time Among Teenagers: United States, July 2021–December 2023.
The source defines Hispanic as any race and uses NCHS county classifications; nonmetropolitan counties include micropolitan and noncore counties. Income is grouped relative to the federal poverty level, while parental education is reported in grouped categories.
Physical activity also differed by screen-time group. 70.4% of teens reporting no more than 2 hours of screen time reported 60 minutes of physical activity most days or every day, compared with 54.4% among those reporting at least 4 hours; overall, the figure was 61.1%.
Both measures are self-reported, and the association is descriptive rather than causal.
Children’s Screen Time Trends and Activity Breakdowns
Common Sense measured total entertainment and media use among U.S. children, which is broader than computer time and is not the same measure as the CDC weekday question. Its 2021 figures were collected during the pandemic period and should not be treated as a current global estimate.
| Group and period | Average total screen use | More than 8 hours per day |
|---|---|---|
| Ages 8–12, 2019 | 4 hours 44 minutes | — |
| Ages 8–12, 2021 | 5 hours 33 minutes | 20% |
| Ages 13–18, 2019 | 7 hours 22 minutes | — |
| Ages 13–18, 2021 | 8 hours 39 minutes | 41% |
Source: Common Sense Census: Media Use by Tweens and Teens, 2021.
In 2021, 27% of tweens reported 4:01–8:00 hours of screen media per day, compared with 34% of teens. Average activity allocations show where some of that media time went:
- Tweens averaged 2 hours 40 minutes of television or video use per day, including TV shows and online video.
- Teens averaged 3 hours 16 minutes of television or video use per day.
- Tweens averaged 1 hour 27 minutes of gaming per day across consoles, portable players, computers and mobile devices.
- Teens averaged 1 hour 46 minutes of gaming per day across multiple device types.
- Teens averaged 1 hour 27 minutes of social-media use per day and 51 minutes of website browsing.
- Tweens averaged 24 minutes of website browsing per day.
These categories overlap with computer use but do not isolate a monitor, operating system or device type.
Digital Screen Time for Learning and Leisure
PISA 2022 provides a school-focused international view. Across OECD countries, 15-year-olds reported an average of 2.0 hours per school day using digital devices for learning at school and 1.1 hours for leisure at school.
| PISA 2022 measure | OECD average | Italy |
|---|---|---|
| Learning at school, at least 1 hour per day | 55% | 67% |
| Learning outside school on a typical weekend day, at least 1 hour | 50% | 59% |
| Leisure at school, more than 1 hour per day | 35% | 45% |
| Average learning use at school | 2.0 hours/day | — |
| Average leisure use at school | 1.1 hours/day | — |
Source: OECD, PISA 2022 Results (Volume II): Learning During—and From—Digital Transformation.
Digital tools are broader than computers, and the figures are student-reported typical use. The OECD analysis also found that students using digital devices for leisure 2–4 hours per day before and after school had higher mathematics scores than those using them less; this is an association, and the exact score difference varies by analysis.
Computer Screen Time, Sleep and Physical Activity
Adult evidence uses different definitions again. A 2018 survey of 122,058 adults ages 27–85 in the United States and Puerto Rico found that 41.2% reported daily screen use in the hour before bed, while 17.4% reported no screen use during that hour.
In the same cross-sectional analysis, daily pre-bed screen use was associated with 7.64 fewer workday sleep minutes and a 33% higher prevalence of poor sleep quality. Among evening chronotypes, the association was 8.36 fewer workday sleep minutes; among morning chronotypes, it was 5.64 fewer, and the nonworkday association was 5.04 fewer minutes.
Source: Electronic Screen Use and Sleep Duration and Timing in Adults.
A separate direct-measurement study of adults in the Health eHeart Study found median smartphone screen time of 38.4 hours over 30 days, equivalent to a median average of 3.7 minutes per hour across the measurement period. This was smartphone-only measurement in a cohort subset, not total computer or device screen time.
Source: Direct Measurements of Smartphone Screen-Time: Relationships with Demographics and Sleep.
Neither adult study establishes that screens caused the observed sleep outcomes. The first is an adjusted cross-sectional association, while the second directly measured smartphone use but covered a narrower device category.
Screen Time, Eye Strain and Wellbeing Measurements
A meta-analysis of 26 studies involving 19,417 university students found pooled odds of digital eye strain were 2.06 times higher with greater screen exposure. The evidence was observational and heterogeneous, with I²=88.8% and varying exposure definitions.
Sensitivity analyses produced a pooled odds ratio of 1.96 after removing five major contributors to heterogeneity and 1.79 after trim-and-fill correction for possible publication bias. These are derived estimates, not direct prevalence percentages.
The same review reported that beyond 3 hours of daily screen exposure, each additional hour was associated with more than a 10% relative increase in risk of sleep-quality deterioration. The dose-response synthesis remains an association based on heterogeneous study measures.
For younger children, WHO recommendations are limits rather than observed behavior: no sedentary screen time for infants under 1 year, no more than 1 hour per day for 2-year-olds, and no more than 1 hour per day for children ages 3–4, with less considered better.
Source: WHO, To grow up healthy, children need to sit less and play more.
Historical UK attitudes add a wellbeing perspective. In an Ofcom survey conducted in 2016, 28% of children ages 12–15 said they found it hard to control screen time, 21% said screen time got in the way of family time, and 64% said they had a good balance between screen time and other activities.
Source: Ofcom, Children and parents: media use and attitudes report 2016.
The Ofcom figures cover all screens and are historical self-reported attitudes. Across this article, the central comparison is therefore between measures with clearly different definitions, not a single universal estimate of computer-monitor exposure.