Reaction Time Test
Click the moment the screen turns from red to green. See your reaction time in milliseconds (ms), then play several attempts to get your average and best time, saved in this browser. Just for practice and fun, not a medical or professional measurement.
SESSION RESULT
One result is noisy. The average of 5 to 10 attempts is steadier, so play another round and see whether your average comes down.
How to use
How this reaction time test works
This free reaction time test measures how quickly you can respond to a simple visual signal, in milliseconds (ms, one thousandth of a second). Press Start game and the box turns red. After a random wait it turns green and tells you to click. Click or tap the box as fast as you can and the test shows your time. Choose 3, 5 or 10 attempts, and at the end you get your session average, your best single attempt and a light-hearted rating. Your all-time best is saved in this browser so you can try to beat it next time. It is a simple tool for practice, curiosity and friendly challenges. It is not a medical, scientific or professional measurement.
Take the test in three steps
- Pick the number of attempts. Choose 3 for a quick look, or 5 or 10 for a steadier average.
- Press Start game and wait. The box turns red and asks you to wait. Keep your hand on the mouse button, the trackpad, the screen or the Space bar, and keep your eyes on the box.
- Click the moment it turns green. Your time for that attempt appears in the box. Click again to move on to the next attempt. After the last one, your average and best time appear below.
What happens during each attempt
When an attempt begins, the box turns red and the test picks a random waiting time between 1.5 and 5 seconds. Because the delay is different every time, you cannot learn the rhythm and you cannot score well by guessing. When the wait ends, the box turns green and the test starts its clock at that same moment, using the timer that your browser provides for performance measurements. The clock stops when your click reaches the page. You can also press the Space bar or the Enter key, because the box is selected automatically when you press Start game. The difference between the two moments is your reaction time for that attempt, rounded to the nearest millisecond. Every attempt also appears as a small chip under the box, and the fastest one in the current session is highlighted.
What counts as a false start
If you click while the box is still red, that is a false start. The waiting phase is cancelled, the box tells you it was too soon, and the click does not count as a result. Click the box once more and a new red phase begins with a fresh random wait. The same attempt is repeated, so a false start does not use up one of your attempts and it never raises or lowers your average. It does leave a mark: the “Valid attempts” line in your session summary adds “(with false starts)” so you can see that it happened. Guessing the timing is therefore not a winning strategy. A better habit is to stay relaxed, watch the box and wait for the color to change.
How the average and best are calculated
Only valid attempts are counted. Your session average is the sum of your valid times divided by the number of valid attempts, rounded to the nearest millisecond. Your session best is the single lowest time. For example, if your three attempts are 312 ms, 268 ms and 290 ms, the total is 870 ms, the average is 870 ÷ 3 = 290 ms, and the best is 268 ms. The rating shown under the average is based on the average, not on the best, because one lucky click says less than a group of results does. After every finished session the tool also compares your best time with the one saved in this browser and keeps the lower of the two, and it adds one to the count of sessions you have completed. The Clear record button erases both numbers.
What the ratings mean
The rating is a light-hearted label based on your session average. The cut-offs below are fixed numbers chosen for fun. They are not a clinical or scientific standard.
| Session average | Rating |
|---|---|
| Under 160 ms | Very fast |
| 160 to under 200 ms | Fast |
| 200 to under 250 ms | Good |
| 250 to under 320 ms | Typical range |
| 320 to under 420 ms | On the slower side |
| 420 ms or more | Keep practicing |
What is a typical reaction time?
For a simple test like this one, where you wait for one signal and give one response, the figure most often quoted for a person’s visual reaction time is roughly 200 to 300 ms. Treat that as an approximate range, not a rule. It varies with age, alertness, practice, the type of test and the equipment used. In a browser, the number you see also includes delays that are not your own, which is why an online result can be somewhat higher than one from laboratory equipment. If your average lands in or near that range, you are in good company. If it is higher or lower, that tells you about this setup on this day and nothing more.
Why one result is noisy, and why to average 5 to 10 attempts
A single attempt is affected by many small things: whether you were looking right at the box, a tiny lapse of attention, how long the random wait happened to be, and the timing hiccups of your computer. Two clicks that feel identical can differ by dozens of milliseconds. Averaging smooths out those ups and downs, which is why this page suggests 5 or 10 attempts instead of one. Some people treat the first attempt of the day as a warm-up and judge themselves on the rest. Try to compare like with like: use the same device, the same browser and the same number of attempts when you track progress over days or weeks. A difference of a few milliseconds between two sessions is usually just noise. A shift that shows up again and again across several sessions means more.
What your number includes besides your own reaction
Your result is the time from the moment the page changes the box to green until the page receives your click. That time contains your own reaction, but also a chain of small delays. The display has to draw the new color, your eyes and brain have to notice it, your hand has to move, the mouse, keyboard or touchscreen has to report the action, and the browser has to deliver it to the page. Each step is small, and together they commonly add up to tens of milliseconds. A mouse click is counted when you release the button, not when you press it, so the time you hold the button down is included in your result. The Space bar and Enter key are counted when the key goes down, so the two methods can give different numbers for the same person. Pick one input method and keep using it if you want to compare results over time.
Monitor refresh rate, mouse and other hardware
A display draws a new image at fixed intervals. A 60 Hz screen refreshes about every 16.7 ms, a 144 Hz screen about every 6.9 ms, and a 240 Hz screen about every 4.2 ms. The color change cannot appear between refreshes, so on a 60 Hz screen it can show up as much as about one refresh interval (roughly 17 ms) after the page asked for it, while on a 144 Hz screen the wait is at most about 7 ms. Other parts matter too. A wired mouse, a wireless gaming mouse and a basic Bluetooth mouse can differ by a few milliseconds, a touchscreen or trackpad behaves differently from a mouse, and a TV used as a monitor can add noticeable delay unless it is in a game or PC mode. A slow or busy computer, many open tabs, battery-saver modes and background downloads can also add delay or make it uneven. The test cannot see any of this, so it cannot subtract it. To see how long one frame lasts on your own screen, the Refresh Rate Converter turns hertz into milliseconds.
Tips for steadier results
- Settle in first. Sit comfortably, rest your hand on the mouse button or the keys, and look at the middle of the box instead of its edges.
- Do not predict. The wait is random, so guessing only leads to false starts. Wait until the color actually changes.
- Close extra tabs and downloads. A busy computer can delay the page and spread your results out.
- Use the same setup each time. Same device, same input method and same number of attempts make your sessions comparable.
- Take breaks. If you feel tired or distracted, your times tend to get slower and less even. Rest, then try again.
- Keep the tab in front. Browsers can slow down timers in background tabs, so stay on this page while you play.
- Stop if anything hurts. Rest your hand and eyes whenever you feel strain.
One example: practicing for a ticket drop or a fast-click moment
Some people use a test like this to practice for a limited ticket sale, a product drop or a booking window that opens at a set time, where the first seconds can matter. The wait-then-click pattern here is similar to that situation, and it can help you get used to staying calm while the page is not ready yet. Keep the limits in mind, though. The real outcome depends far more on things this page cannot train: your internet connection, how busy the seller’s site is, and whether the seller uses a waiting room, a queue or a lottery instead of first come, first served. Before a sale, have your account logged in, your payment details ready and the opening time confirmed in your own time zone. Also read the seller’s rules, because bots, scripts and auto-clickers are often forbidden and can get an account blocked. This page is only for practicing your own reaction. It does not make any purchase more likely to succeed.
Using the saved record and sharing your result
After each finished session the page shows your all-time best single attempt and the number of sessions you have played. These two numbers are stored only in your browser, on this device. They do not follow you to another browser or phone, and clearing your site data or pressing Clear record removes them. The share button builds a short message with your average, best time and rating, plus the address of this page. On phones and other devices that support it, the button opens the share sheet. Otherwise it copies the message so you can paste it into a chat and challenge a friend.
Not a medical or professional test
This tool is designed for practice, curiosity and fun. It cannot diagnose anything, and a high or low number does not say anything about your health, your driving ability or your fitness for any job. If you have a concern about your reaction speed, alertness or health, talk to a qualified professional instead of relying on a web page.
Frequently asked questions
What is a good reaction time on this test?
For a simple visual test, the figure most often quoted for people is roughly 200 to 300 milliseconds, though it varies with age, alertness, practice and equipment. On this page, a session average under 250 ms is rated Good or better, and 250 to 319 ms is labeled the typical range. Online tests also include display, input and browser delays, so use your number to compare yourself with yourself rather than with anyone else.
Why do my results change every time?
A single attempt depends on your attention, anticipation, the random wait and tiny timing differences in your computer, so results vary even when you try your best. Averaging 5 or 10 attempts gives a steadier number. A few milliseconds of difference between sessions is normal.
What happens if I click before the screen turns green?
It counts as a false start. The attempt is cancelled and the box says you were too soon. Click the box again to start a new wait. The early click is not added to your results, the same attempt is repeated, and your session summary notes that false starts happened.
How are the average and best time calculated?
The average is the total of your valid attempt times divided by the number of valid attempts, rounded to the nearest millisecond. The best is the lowest single time. The all-time best saved in your browser is the lowest single attempt from any session you finished.
Do my monitor, mouse and browser affect the result?
Yes. The number includes your display's refresh interval, the delay of your mouse, keyboard or touchscreen, and the time your browser needs to pass the click to the page. Together these commonly add tens of milliseconds, so the same person can score differently on different setups. Keep your setup the same when you track progress.
Are my results saved or sent anywhere?
Your all-time best time and the number of sessions you have finished are stored only in your browser's local storage on this device. Your times are not sent to a server. You can erase them with the Clear record button or by clearing your browser data.
Can I use the keyboard instead of the mouse?
Yes. After you press Start game, the reaction box is selected, so you can press the Space bar or Enter instead of clicking. A key press is counted the moment the key goes down, while a mouse click is counted when the button is released, so the two can give different numbers. Use the same method each time when you compare results.
Is this a medical or professional test?
No. It is a simple game for practice and fun. It cannot diagnose anything and should not be used to judge your health, driving ability or fitness for a job. For any such question, speak with a qualified professional.
Related tools
Reference note: the roughly 200 to 300 ms range for simple visual reaction time is an approximate, commonly quoted figure. It varies with age, device, test design and individual differences.
This tool is for practice and entertainment. Results are not a medical or professional measurement and depend on your device, browser and input method.