Reaction Time Test
Click as soon as the box turns green and see your reaction time in milliseconds.
How to use: Wait for the box to turn green, then click as fast as you can. Repeat to get an average.
How to use the Reaction Time Test
Reaction time is the delay between seeing something and acting on it. Athletes, drivers and gamers all rely on quick reactions, and this simple test lets you measure yours in milliseconds.
Click the box to begin. It turns red and you must wait. At a random moment between about one and a half and five seconds it turns green. Click as quickly as you can. Your time for that round appears, and after five rounds you will see your average, your fastest time, a rating and your best ever score on this device. If you click too early, the round restarts, so do not guess.
The average human visual reaction time is about 250 milliseconds, with young, alert people often scoring between 200 and 270. The result you see includes your screen, mouse or trackpad and browser, which can add a few dozen milliseconds, so compare scores only on the same device. Tiredness, distraction and caffeine all change results.
For the fairest score, sit comfortably, use a mouse rather than a touchpad, and keep your finger poised on the button. Play several sessions, because the first rounds are usually slower. Tests like this are for fun and training, not medical diagnosis.
Frequently asked questions
What is a good reaction time?
Under 250 ms is good. Under 200 ms is excellent, though your device adds some delay.
Why does it say “too soon”?
You clicked before the box turned green. Wait for the colour change.
Does my device affect the result?
Yes. Screen refresh rate and input delay add to your time, so compare scores on the same device.