About the Reaction Time Test
This Reaction Time Test measures how quickly you respond to a visual signal. Click the large panel to begin, wait while it shows a waiting message, and click or press Space the moment the screen turns green. The delay before green is random, between 1.5 and 4.5 seconds, so you cannot guess it. Your time is shown in milliseconds after each round, and after five rounds you see your average, median, best and worst times, a rating and a table of every round. Clicking too early counts as a false start, not as a round. The time includes the delay of your screen, mouse or touch panel and browser, so it is higher than your body's own reaction time. Use it to compare your own results over time. It is not a medical test, and nothing is sent anywhere.
Updated October 2026
How to use the Reaction Time Test
- 1Click the panel (or press Space or Enter) to start a round.
- 2Wait while the panel shows Wait for green. Do not click yet.
- 3Click as soon as the panel turns green and says Click now.
- 4Complete five rounds and read your average, median, best and worst times.
How the test works
Each round has three steps. You start it with a click, the panel waits for a random time between 1.5 and 4.5 seconds, and then it turns green. The timer starts when the green has been painted on the screen and stops at the moment you press down with the mouse, touch or a key. That gap is your reaction time for the round.
If you click during the wait, the round does not count. You get a message and can try again. If you switch to another tab during a round the test cancels itself, because the delay would be unfair.
What is a good score
Most people see results between 200 and 300 milliseconds. Times below 200 are excellent and are often set by practised gamers on fast hardware. Times below about 80 milliseconds are almost certainly a lucky guess, and the tool marks them as such.
Do not judge yourself by one round. Look at the median and the average of all five, and compare them from day to day on the same device.
What affects your result
- Screen refresh rate and response time
- Mouse or touch panel delay, and whether you use a keyboard key instead
- Tiredness, caffeine and how alert you are
- Distraction, and whether your hand is resting ready
- Browser and device load, since a busy phone can add delay
Ways to react faster
Warm up with a few rounds, sit comfortably and rest your finger on the button without pressing it. Keep your eyes on the middle of the panel and breathe normally. Trying to guess the moment leads to false starts, so wait for the colour instead.
If you like measuring yourself, try the Typing Speed Test for keyboard skill, or use the Stopwatch to time your own activities. The reaction test is for fun and self-comparison, and it is not a medical assessment. For a clicking game use the Dice Roller, and for the time spent use the Online Stopwatch.
Features
- Random wait of 1.5 to 4.5 seconds before each signal
- Five rounds per session
- Time in milliseconds for every round
- Average, median, best and worst
- Rating from Excellent to Slow
- False starts are counted separately
- Works with mouse, touch and keyboard
- Copy your result as text
Frequently asked questions
What is a good reaction time?
On a computer, a result between 200 and 250 milliseconds is very good, and under 200 is excellent. The tool rates 250 to 299 as good, 300 to 399 as average and anything from 400 as slow. These bands are a rough guide, and they include the delay of your own screen and mouse.
What is the average human reaction time?
For a simple visual signal, studies commonly report about 200 to 300 milliseconds. In this test the typical adult result also falls in that range, although a slow display or a phone touch screen can add tens of milliseconds to it.
Why is my reaction time different each time?
Your attention, tiredness, how ready your hand is and the random length of the wait all change a result. That is why the test has five rounds and shows the median as well as the average, which is less affected by one unusually slow round.
How can I improve my reaction time?
Sleep well, stay alert and keep your finger resting on the button so you have little distance to move. Look at the centre of the panel instead of a corner, and do not guess when the signal will come, because guessing causes false starts. Consistent practice helps a little.
Does screen refresh rate matter?
Yes, a little. A 60 Hz screen redraws every 16.7 milliseconds, while a 144 Hz screen redraws every 6.9 milliseconds, so the green may appear slightly later on a slower screen. Your mouse, browser and operating system add small delays too.
Is the test accurate?
It is good for comparing your own results on the same device, but it cannot separate your reflexes from your hardware delay. The clock starts once the green screen has been drawn and stops at your click, which is as precise as a web page can be. It is not a medical or professional test.