Reaction Time Test
Click as soon as the box turns green. Clicking too early restarts the round.
Last updated
—Last time (ms)
—Best time (ms)
—Average (last 5)
Click to start
How to test your reaction time
- Click the box to start, then wait for green.
- As soon as it turns green, click as fast as you can.
- Click too early and the round restarts. Your best and average times are saved.
About this game
Click the instant the box turns green — clicking too early during the red phase restarts the round. Your best time and recent average are saved on this device. Typical human reaction time is roughly 200–300ms; much faster usually means you anticipated the change rather than reacted to it.
Questions about reaction time
What is a good reaction time?
Most people react in about 200 to 300 milliseconds. Under 200 is very quick.
Why are my times slower on a phone?
Touch screens and screen refresh rates add a little delay, so compare times on the same device.
Can I improve my reaction time?
A little, with practice, sleep and less tiredness. Very fast times often mean you guessed rather than reacted.
What does milliseconds mean?
Thousandths of a second: 250 ms is a quarter of a second.