Reaction Time Test
Measure your reaction time in milliseconds. Wait for the green screen, then click as fast as you can.
How to play
- Click the red box to start — it will say "Wait for green…".
- Wait patiently. The box turns green at a random delay (1.5–4.5 s).
- Click the green box as fast as possible when it appears.
- Your reaction time in milliseconds is shown. Click again to retry.
- Avoid clicking early — the test detects false starts and resets.
Wait for the box to turn green, then click as fast as possible. Measures your visual reaction time in milliseconds. Average human reaction time is around 200–250 ms.
Frequently asked questions
- What is a good reaction time?
- The average human reaction time is 200–250 ms. Elite gamers and athletes often hit 150–180 ms. Under 200 ms is excellent.
- Why does clicking too early reset it?
- Anticipating the signal (false start) doesn't count as a true reaction — the test waits for you to actually respond to the visual cue.