Reaction Time Test
Wait for green, then click or tap as fast as you can.
Click to start
How the test works
Click the box to start. After a random wait of between 1.5 and 4 seconds, it turns green, and the timer measures how long you take to respond. Clicking before it turns green resets the round, so guessing the timing doesn’t help. Your fastest time is saved in this browser.
| Action | Controls |
|---|---|
| Start and respond | Click or tap the box |
What your time means
| Time | Rating |
|---|---|
| Under 200 ms | Lightning fast |
| 200 to 299 ms | Excellent |
| 300 to 399 ms | Good |
| 400 to 499 ms | Average |
| 500 ms or more | Keep practicing |
Typical simple visual reaction times for adults are a little over 200 milliseconds in a lab, and online tests usually measure a bit slower because of the device.
What affects the result
- Your device. Screen refresh rate and input delay add a few to a few dozen milliseconds. Compare results on the same device.
- Tiredness, alertness, and age. Reaction times are slower when tired and tend to lengthen gradually with age.
- The signal. People generally react to a sound a little faster than to a visual change.
- Practice. Times improve over the first few tries as you settle into the task.
Getting a fair number
One fast result can be luck. Do five or more rounds and look at your typical time, not the single best. For another reflex test with a score, try Whack-a-Mole.