How the reaction time test works
Press Start test and the panel turns red. After a random pause of a few seconds it switches to green. Click, tap or press Space the instant you see the change. The test records the gap between the green frame and your response in milliseconds (ms).
You get five tries, and your score is the average of all five. If you click while the panel is still red, that try is cancelled and you repeat it, so guessing does not help.
The pause before green is random on purpose. If the timing were predictable you could learn the rhythm, and the test would measure anticipation instead of reaction.
What is a good reaction time?
Use this table as a rough guide for a mouse or touch test on an ordinary screen.
| Average time | Rating |
|---|---|
| Under 200 ms | Exceptional |
| 200 to 229 ms | Fast |
| 230 to 259 ms | Above average |
| 260 to 299 ms | Average |
| 300 to 359 ms | Below average |
| 360 ms or more | Slow |
In controlled lab studies, young adults typically respond to a simple visual signal in about 200 to 250 ms. Online results run slower because of hardware delay. Human Benchmark, the best known site for this test, reports a median of 273 ms across its users, which is why the “average” band here is centered just below 300 ms.
What affects your score
Your hardware. A 60 Hz display draws a new frame every 16.7 ms, while a 144 Hz display does it every 6.9 ms. Add the response time of the panel, the polling rate of your mouse and any image processing in a TV, and the same person can score 30 to 50 ms apart on two setups. This is the biggest reason scores from different devices should not be compared directly.
Sleep and alertness. Reaction time is one of the first things to suffer when you are tired. Sleep researchers use a very similar task, the psychomotor vigilance test, to measure how impaired a sleep-deprived person is.
Age. Speed peaks in the early to mid twenties and declines slowly after that. The drop is real but small, and older players often compensate with better anticipation.
Caffeine and time of day. A moderate dose of caffeine reliably shaves a few milliseconds off simple reaction time. Most people are also a bit slower right after waking up and late at night.
The signal itself. People respond to sound faster than to light, often by 30 to 50 ms, because the auditory pathway reaches the brain sooner. This test uses a visual signal only.
Why five tries instead of one
A single click tells you very little. Even a focused person swings by 30 ms or more from one try to the next, and one lucky early twitch can look like a world-class score. Averaging five valid tries gives a number you can actually compare from day to day. For a steadier figure still, run the test a few times and watch the average in the Your scores panel.
How to get a faster reaction time
- Use a wired mouse and a monitor in game mode or at its highest refresh rate.
- Keep your finger resting on the button, already touching it.
- Look at the middle of the panel and relax your hand. Tension slows the movement.
- Respond to the color change itself. Do not try to predict when it will come.
- Test when you are rested. A short warm-up of two or three runs helps too.
Once you are happy with your reflexes, try the aim trainer, which adds mouse movement to the same skill, or switch to memory with the chimp test.