Reaction Time Test
Wait for green, click fast. Average of five rounds in milliseconds.
About the test
Click to arm the box, wait through a random red delay, and click the instant it turns green. Clicking early voids the round. Five rounds make a run, and the average is your score โ single rounds are too noisy to mean much, which is also why the random delay exists: a fixed delay would measure anticipation, not reaction.
What is normal, and what moves the number
The human median for a simple visual reaction is around 250 ms, with most adults between 200 and 280. Under 200 is quick; elite esports players and sprinters sit around 150โ180. Below about 120 ms is anticipation, not reaction โ athletics rules a start faster than 100 ms after the gun a false start for exactly this reason.
Your score includes your hardware: a 60 Hz screen adds up to 16 ms before the green even appears, wireless mice add a few more, so compare runs on the same setup only. Tiredness, alcohol and age all slow reactions measurably; caffeine buys a few milliseconds back. Auditory reactions are ~40 ms faster than visual ones, which is why sprinters start to a gun rather than a light.
Frequently asked questions
What is the average human reaction time?
About 250 milliseconds for a visual stimulus. 200โ280 ms is the normal adult range, and anything under 200 is genuinely fast.
Why is my reaction time worse than the pros I watch?
Elite players sit around 150โ180 ms, but most of their edge is prediction and practised movement, not raw reaction. Hardware also matters: high-refresh screens shave real milliseconds off the measurement.
Why did it say I clicked too soon?
You clicked during the red waiting phase. The delay is random precisely so you cannot time it โ anticipating is the thing the test is designed to catch.
Can I improve my reaction time?
Modestly. Sleep, alertness and practice at the specific task help; genetics set the floor. Reaction time also naturally lengthens with age, starting from the mid-twenties.