How the reaction time test works
This reaction time test measures simple visual reaction time: how quickly you respond to one signal you are waiting for. Use it as a click reaction test with a mouse, tap it on a phone or tablet, or press the spacebar or Enter on a keyboard.
- Click or tap the big panel, or press Space or Enter, to start.
- The panel turns red and says Wait for green. Do not press yet.
- After a random delay of 2 to 5 seconds it turns green. Press as fast as you can.
- Your time appears. Press again for the next attempt, until you have five.
- Read your run: each attempt, plus your average, median and best.
Press while the panel is still red and it is a false start: that attempt is not counted, and you retry it. A press less than 100 ms after green is treated the same way, because that is anticipation, not reaction. The median is shown too, because one slow attempt moves it far less than the average.
What is reaction time?
Reaction time is the delay between a signal and your response to it. What this page measures is called simple reaction time: one expected signal, one response, made as fast as possible. Researchers treat it as a basic measure of how quickly your brain processes information. Choice reaction time takes longer, because each signal has its own response, so you must tell the signals apart and pick the right one first.
What your reaction time means
The fairest comparison for a browser score is other browser scores. Human Benchmark reports a median of 273 ms from more than 81 million clicks. The site testreaction.com reports a median of 295 ms from about 3,700 results (September 2026). Here is how the labels this test gives line up:
| Your average | Label on this test | How it compares |
|---|---|---|
| Under 200 ms | Exceptionally fast | In the fastest tenth on testreaction.com (under 215 ms) |
| 200 to 249 ms | Fast | Quicker than the 273 ms median Human Benchmark reports |
| 250 to 299 ms | Typical for an online test | Around the published medians: 273 ms (Human Benchmark) and 295 ms (testreaction.com) |
| 300 to 399 ms | A little slower than typical | Common: the middle half of testreaction.com results runs from 243 to 361 ms |
| 400 ms or more | Slow | Slower than most online results. Try again rested and focused |
Why an online reaction time test reads slower than a lab. In one large lab study of 1,469 adults, the mean simple reaction time was 231 ms, or 213 ms after subtracting the 17.8 ms the researchers measured for their own monitor and mouse. At home, nobody controls the equipment. When researchers used a robot to press keys on ordinary laptops and desktops, browser-based test platforms logged its responses about 70 to 90 ms late. Any human reaction test in a browser measures your reaction plus your setup, which is why the table compares you with other online tests.
Why this reaction time tester is more accurate
Some delay comes from how a test is built. This reaction time tester adds as little as possible and is upfront about the rest.
- Timed on press, not release. Your press counts the instant the mouse button or your finger goes down (the browser's pointerdown event), or when Space or Enter goes down. A click event only fires after the button is released, so it would add however long you hold it.
- The clock starts when green is on screen. Timing begins on the animation frame in which the green is actually drawn, read from the browser's high-resolution timer (performance.now), not at the moment the code asks for the color change.
- Your refresh rate, measured. The test measures your screen's refresh rate and tells you how much delay it adds. At 60 Hz a new frame can take up to about 16.7 ms to appear. At 144 Hz, about 7 ms.
- Honest about the rest. This test cannot measure mouse or monitor processing lag, and it says so rather than guessing a correction.
How to get a fair score on a reaction speed test
To test reaction time fairly, on this page or any other reaction speed test, control what you can and compare like with like:
- Test when you are rested. Sleep loss slows responses; the numbers are further down this page.
- Close other tabs and apps. Background software can interrupt the browser and add unpredictable delays.
- Check the refresh rate the test reports. If it says 60 Hz on a 120 Hz or 144 Hz screen, check your display settings.
- Do not guess. The wait is random, and an early press only costs you a retry.
- Compare on the same device. Timing differs between browsers, operating systems and computers, so a phone score and a laptop score are not the same measurement.
Reaction time test with sound
Switch to Sound mode and the test plays a short beep instead of changing color, so you measure auditory reaction time. People generally react faster to a sound than to a light: lab studies summarized by Jain and colleagues put visual reaction at around 180 to 200 ms and reaction to a sound at around 140 to 160 ms, and their own study of 120 medical students also found sound faster.
There is a catch. The beep reaches you only after your device's audio output latency. Some browsers report that figure, and the test allows for it. Others do not, and the result then warns that sound times may read slow. Turn your sound on first, and compare sound scores on the same device and browser.
How to improve your reaction time
The research on how to improve reaction time points at sleep, caffeine and your setup more than at drills:
- Sleep. After 17 to 19 hours awake, people in one study did as badly on some tests as they did at a 0.05% blood alcohol level, or worse.
- Caffeine. A 2016 review found that low to moderate doses improve alertness, attention and reaction time.
- Practice. Less than you might expect. One study found no significant learning effect across three weekly sessions, and another found mean and median times unchanged over 16 repeats of a standard alertness test. Repetition mainly cuts false starts and makes you more consistent.
- Your device. Screen refresh, display processing and input lag all add time, as covered above.
- Age, which you cannot change. Children and teenagers respond more slowly than adults. In adults, simple reaction time changes little until around 50, according to a UK survey of 7,130 adults. The average reaction time page breaks this down by age.
More reaction tests: F1 start and averages
Want a reaction time game with more pressure? The F1 reaction test copies a Formula 1 start: five red lights come on one per second, then all go out after a random hold, and you react the instant they go dark.
For how scores vary with age and what counts as normal, read the average reaction time guide, then head back to the test.
Frequently asked questions
What is reaction time?
It is how long you take to respond once something happens, such as pressing the moment a panel turns green. A score taken on a computer or phone is your reaction plus some delay from the screen and from the mouse, key or touchscreen, which is why lab studies record lower times than browser tests.
How can I test my reaction speed?
Use an online reaction time test like this one. Click, tap or press Space or Enter on the panel to start. It turns red, and after a random 2 to 5 seconds it turns green: press as fast as you can. An early press is a false start and is retried. After five valid attempts you see each time plus your average, median and best. Test when rested, and on the same device each time.
Can I test my reaction time at home?
Yes. A phone or computer is enough: open this page and run five attempts. Without a screen, try the ruler drop. A friend holds a ruler upright just above your open thumb and finger, then lets go without warning, and you catch it. The farther it falls, the slower you were. A catch at 8 inches works out to about 0.2 seconds, and at 12 inches to about 0.25 seconds.
Is a reaction time of 200ms good?
Yes. A five-attempt average of 200 ms is fast for a browser test, and anything below it is labeled exceptionally fast here. It puts you in the fastest tenth of results published by testreaction.com, where that tenth starts under 215 ms, and well under the 273 ms median Human Benchmark reports. One large lab study put adults aged 18 to 24 at about 200 ms once equipment delay was removed. A single lucky 200 ms attempt is not the same as a 200 ms average.
Is 300 ms good reaction time?
It is close to average for an online test, on the slower side of typical. Human Benchmark reports a median of 273 ms and testreaction.com a median of 295 ms, so 300 ms sits near the middle. Lab studies record faster times, 231 ms on average in one study of 1,469 adults, because their equipment adds less delay. This test labels 300 ms a little slower than typical. Rest, focus and a faster screen can bring it down.
Is 350 reaction time good?
It is a little slower than typical, but common. On testreaction.com the middle half of all results runs from 243 to 361 ms, so 350 ms is still inside that range, near its slow end. Before reading much into it, check the refresh rate this test reports, close other apps and try again when rested. If your average stays near 350 ms every time on the same device, that is simply your baseline there.
What is a good reaction time for a 14-year-old?
There is no official benchmark for a 14-year-old on a browser test. A review of 72 studies found that children and teenagers respond more slowly than adults, with the gap closing quickly in childhood and more slowly through adolescence. So a 13- or 14-year-old will usually be close to a young adult, or a little slower. Compare your average with the online medians of about 270 to 300 ms rather than with one exact number.
How can I improve my reaction time?
Sleep matters most: in one study, 17 to 19 hours awake left performance on some tests as poor as at a 0.05% blood alcohol level. Low to moderate doses of caffeine improve reaction time, according to a 2016 review, and a review of action video game research found that playing them speeds responses without costing accuracy. Repeating a simple test, by contrast, barely changes your average. Cutting lag helps too: use a higher refresh rate and close background apps.
Do ADHD people have faster reflexes?
The research does not show faster reaction times in ADHD. A 2013 review of 319 studies found that children, teenagers and adults with ADHD tend to have more variable reaction times than their peers, meaning their times swing more from one attempt to the next. Average speed was not slower once that variability was taken into account. A single online test cannot tell you anything about ADHD; a doctor or psychologist is the right person to ask.
Is this reaction time test free?
Yes. It is free to use as often as you like, with no account and no sign-up. Nothing is uploaded: the test runs on your device, and your best average is saved only in this browser, so clearing your browser data removes it. It works on phones, tablets and computers, and the F1 start test and the average reaction time guide on this site are free too.
Why is my reaction time so slow?
Often it is your equipment, not you. In one lab study the monitor and mouse together added 17.8 ms to every response, and when a robot pressed keys on ordinary laptops and desktops, browser test platforms logged its responses about 70 to 90 ms late. This test measures your screen refresh rate and tells you the delay it adds: up to about 16.7 ms per frame at 60 Hz, about 7 ms at 144 Hz. It cannot measure mouse or monitor processing lag, so compare scores on one device, and test when rested.
Does it work on my phone?
Yes. The test works on phones, tablets and computers. On a phone, tap the panel: your tap is timed the moment your finger touches the screen, not when you lift it. Every screen and input device adds some delay of its own, and it differs between devices, so a phone score and a computer score are not directly comparable. Your best average is saved in the browser you used.
Sources
- Human Benchmark, Reaction Time Statistics, median 273 ms, mean 284 ms, over 81 million clicks
- testreaction.com, Average Reaction Time (live results chart), median 295 ms, middle half 243 to 361 ms (September 2026)
- Woods DL et al. (2015). Factors influencing the latency of simple reaction time. Frontiers in Human Neuroscience 9:131
- Woods DL et al. (2015). Age-related slowing of response selection and production in a visual choice reaction time task. Frontiers in Human Neuroscience 9:193
- Anwyl-Irvine A et al. (2021). Realistic precision and accuracy of online experiment platforms, web browsers, and devices. Behavior Research Methods 53:1407-1425
- Der G, Deary IJ (2006). Age and sex differences in reaction time in adulthood: results from the United Kingdom Health and Lifestyle Survey. Psychology and Aging 21(1):62-73
- Kail R (1991). Developmental change in speed of processing during childhood and adolescence. Psychological Bulletin 109(3):490-501
- Williamson AM, Feyer AM (2000). Moderate sleep deprivation produces impairments in cognitive and motor performance equivalent to legally prescribed levels of alcohol intoxication. Occupational and Environmental Medicine 57(10):649-655
- McLellan TM, Caldwell JA, Lieberman HR (2016). A review of caffeine's effects on cognitive, physical and occupational performance. Neuroscience and Biobehavioral Reviews 71:294-312
- Woods DL et al. (2015). The effects of repeated testing, simulated malingering, and traumatic brain injury on high-precision measures of simple visual reaction time. Frontiers in Human Neuroscience 9:540
- Basner M et al. (2018). Repeated administration effects on Psychomotor Vigilance Test performance. Sleep 41(1):zsx187
- Jain A et al. (2015). A comparative study of visual and auditory reaction times on the basis of gender and physical activity levels of medical first year students. International Journal of Applied and Basic Medical Research 5(2):124-127
- Kofler MJ et al. (2013). Reaction time variability in ADHD: a meta-analytic review of 319 studies. Clinical Psychology Review 33(6):795-811
- Dye MWG, Green CS, Bavelier D (2009). Increasing speed of processing with action video games. Current Directions in Psychological Science 18(6):321-326
- MDN Web Docs, Element: click event