Reaction Time Test
Wait for the screen to turn green, then click as fast as you can. Measure your reaction time in milliseconds and see your best-of-5 average.
More quick games: CPS Test · Typing Speed Test
How It Works
Click to start
The panel turns red and waits a random amount of time — do not click yet.
Wait for green
The moment it turns green, click as fast as you can. Clicking early resets the round.
See your time
Your reaction time shows in milliseconds. Repeat to build a best-of-5 average.
Frequently Asked Questions
What is a good reaction time?+
The average human visual reaction time is around 250 milliseconds. Anything under 200 ms is fast, and elite gamers and athletes often land in the 150–180 ms range.
Why does my reaction time vary?+
Reaction time changes with focus, fatigue, caffeine, screen refresh rate, and input lag. Taking the average of several attempts gives a more reliable number than a single click.
What affects reaction speed?+
Sleep, age, attention, and practice all matter. Reaction time tends to be fastest in your late teens and twenties and can be improved slightly with training.
Does my monitor affect the result?+
Yes. A higher-refresh-rate display (120–240 Hz) shows the green signal sooner than a 60 Hz screen, which can shave 10–20 ms off your measured time.