myReaction Time Test
Click the box the instant it turns green. 5 rounds — how fast are you?
About the Reaction Time Test
Reaction time is the interval between a stimulus appearing and your response to it. This test measures visual reaction time — how quickly you respond to a colour change on screen. The average human reaction time is around 200–250ms. Under 200ms is considered fast; under 150ms is exceptional.
How to get accurate results
Run 5 attempts and use your average. Avoid clicking before the screen turns green — an early click is recorded as a miss. For best results, use a wired mouse or touchscreen, close other tabs, and test when alert.
Colour guide
Results are colour-coded: green = under 200ms (fast), yellow = 200–300ms (average), red = over 300ms (slow). The red "Too early" flash means you clicked before the green appeared.
What affects human reaction time
Average human visual reaction time is 200-250 milliseconds. Auditory reaction time is slightly faster at 150-180ms because sound is processed more directly. Reaction time worsens with fatigue, alcohol, distraction, and age (it peaks in the mid-20s and declines thereafter). Trained athletes in specific sports can achieve sub-200ms responses for expected stimuli.
- Practice effect — repeated testing improves results as you learn to anticipate the stimulus
- Fatigue — reaction time worsens significantly after poor sleep; add 20-40ms when tired
- Caffeine — modest improvement of 10-30ms at moderate doses
- Age — reaction time is fastest in the mid-20s and increases by about 2ms per year after 40