Reaction Time Test
How fast are your reflexes? Click the moment the screen turns green.
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Click to Start
Wait for green, then click as fast as you can
Last
— ms
Best
— ms
Average
— ms
What is this tool?
The Reaction Time Test measures how quickly you respond to a visual stimulus — in this case, a color change on screen. Your result is shown in milliseconds (ms). It is a fun way to benchmark your reflexes, and many people use it to compare scores with friends or track improvement over time.
How to use
- Click the gray box to start.
- Wait — the box will turn green after a random delay.
- Click as fast as you can the moment you see green.
- Your reaction time appears in milliseconds. Take multiple attempts to get your average.
Frequently Asked Questions
Is this tool free?
Yes, it is 100% free with no sign-up required.
What is an average human reaction time?
The average human reaction time to a visual stimulus is around 200–250 milliseconds. Trained athletes and gamers can achieve 150–180 ms consistently.
Why shouldn't I click too early?
Clicking before the screen turns green is called a false start and does not count as a valid result. The test detects early clicks and warns you to wait.
Does caffeine or fatigue affect reaction time?
Yes. Fatigue, alcohol, and distractions slow reaction time, while being alert and well-rested improves it. This test is a fun way to measure the difference.