Test Attention Span: 6 Real Tests You Can Try at Home
The tests researchers actually use, the free versions you can run tonight, and how to read your result without panicking.
The best way to test attention span is a timed task you can repeat: respond to a steady stream of items, hold back on the rare odd one, and count your slips. That is how psychologists do it with tests like the SART and the gradCPT. You can get close at home with a stopwatch, a book, a printed color list and your own phone's pickup count.
I'll be honest about one thing first. Most “attention span quiz” pages online are personality quizzes wearing a lab coat. The six tests below are either real research tasks or simple home versions of them, and none of them diagnoses anything. They give you a baseline, which is what you need if you plan to fix the problem.
What Does an Attention Span Test Measure?
“Attention span” is a loose phrase. Researchers split it into pieces: sustained attention (staying on a boring task), selective attention (ignoring what doesn't matter), and inhibitory control (stopping an automatic response). A good test targets one of these on purpose.
Everyday attention is also shaped by your setting. Gloria Mark, who has logged office workers' screens for two decades, told the American Psychological Association that average time on one screen fell from about 2.5 minutes in 2004 to about 47 seconds in recent studies. That is not a brain scan. It is a habit, measured. The same person can read a thriller for two hours and fail to finish an email.
So when you test attention span, test the thing you care about. Want to read again? Use a reading test. Want to stop grabbing your phone? Measure the grabbing. If you want the bigger picture of where these numbers come from, see average attention span.
6 Ways to Test Attention Span
Start with one lab-style test and one real-life test. Doing all six on the same night is a test of something, but not attention.
The SART (Sustained Attention to Response Task)
Ian Robertson and colleagues built the SART in 1997 to catch the small “oops” lapses of everyday life. Digits 1 to 9 flash one at a time. You press a key for every digit except 3, and hold back on the 3. The task is so dull that your hand goes on autopilot, and the slips on the 3s show it. The original study linked SART errors to everyday attention failures people reported.
The gradCPT (gradual-onset continuous performance task)
Michael Esterman's lab designed the gradCPT in 2013. City and mountain photos fade into each other slowly; you respond to the cities, which come up about 90% of the time, and hold back on the mountains. It also tracks how steady your reaction times are, which shows when you are “in the zone” versus drifting. This is the task Castelo and colleagues used in their 2025 trial on blocking mobile internet. If you want something close at home, TestMyBrain, a nonprofit research site, offers free cognitive tests online.
The Stroop test
The classic from John Ridley Stroop's 1935 paper. You see color words printed in the wrong ink (“RED” in blue) and name the ink, not the word. Home version: write 50 mismatched color words, name the inks aloud, and time yourself. Compare it with naming 50 plain color patches. The gap is the cost of overriding an automatic response.
The breath counting test
Richard Davidson's lab validated breath counting as a measure in 2014. Count breaths from 1 to 9, then start over. Each time you lose count or overshoot, note it and restart at 1. Do it for 10 minutes. It mostly measures mind wandering and awareness of it, which the researchers found was related to but separate from sustained attention. Fewer resets over the weeks means progress.
The reading stretch test
Not a lab task, but the one I trust most for real life. Pick a print book, put your phone in another room, start a stopwatch, and stop it the first time you notice you have drifted or want to check something. Do it three times and take the middle number. If your answer is under five minutes, you have a clear starting line.
The phone pickup test
Your iPhone already runs this one. Open Settings > Screen Time and look at pickups and the apps you opened first after each pickup. A high pickup count is a direct, unglamorous measure of how often your attention gets pulled away. Check it before and after any change you make.
How to Read Your Attention Span Test Results
Lab tests compare you with large samples, so their scores mean more than a home test. Home tests are only useful against your own past results. Here is a rough way to read each one.
| Test | What a weak result looks like | What it mostly reflects |
|---|---|---|
| SART | Pressing on many of the 3s | Autopilot and lapses of sustained attention |
| gradCPT | Missed mountains, jumpy reaction times | Sustained attention and how steady it is |
| Stroop | Big time gap between words and plain colors | Inhibitory control |
| Breath counting | Losing count many times in 10 minutes | Mind wandering and noticing it |
| Reading stretch | Drifting within a few minutes | Real-world focus with distractions removed |
| Phone pickups | A pickup every few minutes while awake | How often habit pulls you away |
Age matters on the lab tasks. Fortenbaugh and colleagues tested 10,430 people on the gradCPT in 2015 and found that sustained attention ability keeps improving through adolescence, peaks in the early 40s, then slowly declines. So a 19-year-old and a 42-year-old should not compare raw scores.
Test conditions matter even more. Sleep badly, run the test at 11 p.m. with your phone buzzing, and you will measure your night, not your brain. Same time of day, same room, phone out of reach, every time.
A test is not a diagnosis. ADHD is diagnosed from persistent symptoms that started in childhood and show up across home, work or school, according to the National Institute of Mental Health. If your focus has always been hard, talk to a clinician. If it slid as your screen time grew, the habit story is more likely.
Why Your Phone Skews Every Attention Span Test
Ward and colleagues (2017) found that just having your own smartphone on the desk, face down and silent, reduced available working memory and fluid intelligence, as described in this University of Texas summary. People in the other room did best. If you test with the phone beside you, you are testing yourself plus a phone.
The phone effect also runs the other way. In Castelo et al. (2025), people who blocked mobile internet on their phones for two weeks improved on the gradCPT, a gain the authors compared to being about 10 years younger, and 91% improved on at least one outcome. Mind wandering has its own cost too: Killingsworth and Gilbert found that people were less happy while their minds wandered than when they didn't.
For how feeds train short bursts of attention, read social media and attention span.
How to Improve Your Attention Span After Testing
Pick one test, take a baseline, change one or two things, and retest in two weeks. The changes with the best evidence are boring on purpose:
- Day 1
Take your baseline: a reading stretch test plus your daily pickups from Screen Time. Write both down.
- Days 2–7
Phone in another room during focus work. Mute everything that isn't a person. Turn on grayscale: Dekker and Baumgartner (2024) found about 20 minutes less screen time a day after a week of grayscale, with more sense of control.
- Days 8–14
Add 10 minutes of breath counting or meditation for attention span each day. Retest on Day 14 under the same conditions as Day 1.
Want the full version? The two-week plan to fix attention span goes step by step, and short attention span covers causes and warning signs.
Tools like Go Gray make the grayscale part one tap from Control Center, give you 30-minute color breaks when you need a photo or a map, and nudge you after 30 minutes and an hour on the apps you pick. Go Gray Pro shows your pickups app by app, so retesting is quick.
The Bottom Line
To test attention span properly, use a real task, keep the conditions the same, and compare yourself with yourself. The SART, gradCPT and Stroop are the lab standards. A reading stretch and your pickup count tell you what actually happens on a Tuesday.
Then do something with the number. If your phone is the main thing pulling you away, make it less interesting. Get Go Gray on the App Store and retest in two weeks. Worst case, you learn your attention was fine and your phone was the problem.
Frequently Asked Questions
How can I test my attention span at home?
Use a timed task you can repeat. A reading stretch test (how long until you drift or reach for your phone), a breath counting test, and a printed Stroop list all work with no equipment. For a lab-style score, the nonprofit research site TestMyBrain offers free online cognitive tests. Repeat the same test under the same conditions so the numbers mean something.
What is a normal attention span for an adult?
There is no single normal number, because attention depends on the task. Gloria Mark’s office studies found people now stay on one screen for about 47 seconds on average, but people can hold focus far longer on something engaging. On lab tasks, sustained attention ability peaks in the early 40s, according to a 10,430-person study.
Which test do psychologists use to measure attention span?
Common ones are continuous performance tests such as the SART and the gradCPT, which make you respond to a steady stream of items and hold back on rare ones, and the Stroop test for control over automatic responses. Clinicians assessing ADHD combine tests like these with interviews and rating scales. No single online quiz is a diagnosis.
Can an attention span test tell me if I have ADHD?
No. A home or online test can show that your focus is weak today, but ADHD is diagnosed from a pattern of symptoms that started in childhood and shows up across settings. If the results worry you, take them to a doctor or psychologist. Bad sleep, stress and constant phone checking can all drag scores down too.
How do I improve my attention span score?
Cut the interruptions first, then practice. In a 2025 randomized trial, blocking mobile internet for two weeks improved scores on the gradCPT, a sustained attention test. Moving the phone out of the room, muting notifications and switching the screen to grayscale are easy ways to start.
References
- Robertson, I. H., Manly, T., Andrade, J., Baddeley, B. T., & Yiend, J. (1997). ‘Oops!’: Performance correlates of everyday attentional failures in traumatic brain injured and normal subjects. Neuropsychologia, 35(6), 747–758. pubmed.ncbi.nlm.nih.gov
- Esterman, M., Noonan, S. K., Rosenberg, M., & DeGutis, J. (2013). In the zone or zoning out? Tracking behavioral and neural fluctuations during sustained attention. Cerebral Cortex, 23(11), 2712–2723. pubmed.ncbi.nlm.nih.gov
- Fortenbaugh, F. C., DeGutis, J., Germine, L., Wilmer, J. B., Grosso, M., Russo, K., & Esterman, M. (2015). Sustained attention across the life span in a sample of 10,000: Dissociating ability and strategy. Psychological Science, 26(9), 1497–1510. pubmed.ncbi.nlm.nih.gov
- Stroop, J. R. (1935). Studies of interference in serial verbal reactions. Journal of Experimental Psychology, 18(6), 643–662. psychclassics.yorku.ca
- Levinson, D. B., Stoll, E. L., Kindy, S. D., Merry, H. L., & Davidson, R. J. (2014). A mind you can count on: Validating breath counting as a behavioral measure of mindfulness. Frontiers in Psychology, 5, 1202. pubmed.ncbi.nlm.nih.gov
- Killingsworth, M. A., & Gilbert, D. T. (2010). A wandering mind is an unhappy mind. Science, 330(6006), 932. pubmed.ncbi.nlm.nih.gov
- Mark, G. (2023). Why our attention spans are shrinking. Speaking of Psychology, Episode 225. American Psychological Association. apa.org
- Ward, A. F., Duke, K., Gneezy, A., & Bos, M. W. (2017). Brain drain: The mere presence of one's own smartphone reduces available cognitive capacity. Journal of the Association for Consumer Research, 2(2), 140–154. news.mccombs.utexas.edu
- Castelo, N., Kushlev, K., Ward, A. F., Esterman, M., & Reiner, P. B. (2025). Blocking mobile internet on smartphones improves sustained attention, mental health, and subjective well-being. PNAS Nexus, 4(2), pgaf017. pmc.ncbi.nlm.nih.gov
- Dekker, C. A., & Baumgartner, S. E. (2024). Is life brighter when your phone is not? The efficacy of a grayscale smartphone intervention addressing digital well-being. Mobile Media & Communication, 12(3), 688–708. pure.uva.nl (PDF)
- National Institute of Mental Health. Attention-deficit/hyperactivity disorder (ADHD). nimh.nih.gov
Make your phone less interesting
Go Gray for iPhone puts grayscale one tap away, with timed color breaks and a nudge when scrolling runs long.
