Reaction time test
Wait for green, then click as fast as you can. Five rounds.
Your times will show here.
Related tools
Test click speed
Click as fast as you can for 5, 10, or 30 seconds and get your clicks per second.
Test keyboard
Press any key and see it register on a full on-screen keyboard, with key codes and rollover.
Test screen colors
Fill your screen with red, black, white, green, or blue, or run a ghosting test.
A test that cannot be gamed
Millisecond precision
Timed from the moment the green appears, with the browser's high-resolution clock.
Early clicks don't count
A click before green cancels the round instead of scoring.
Five-round average
Smooths out one lucky or unlucky click into a number worth comparing.
Private, nothing uploaded
The test runs in your browser tab. No file, key press, click or sound leaves your device.
Take the reaction time test in three steps
- 1
Click to begin a round
The screen turns amber. Wait without clicking.
- 2
Click the moment it turns green
The wait is random, between one and four seconds, so you cannot guess when. Clicking early cancels the round.
- 3
Finish five rounds
Your average of five rounds is shown with each individual time. Press Try again to start over.
Why people measure reaction time
A reaction time number is easy to measure and easy to compare, as long as the test is fair.
Comparing your setup
See whether a new monitor, mouse or refresh rate changes your measured time.
Checking tiredness
Take it fresh and again after a long session to see the difference.
Gaming warm-up
A quick set of rounds before a competitive session.
Frequently asked questions
What is a good reaction time?
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For a visual click test, average adult times are commonly cited at around 250 milliseconds. Under 200 ms is very fast, and many people sit between 220 and 300 ms. The band shown with your average describes the number, it does not rate you as a person.
Why do my times vary so much between rounds?
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Attention, anticipation and tiredness all shift single readings by tens of milliseconds, which is why the test averages five rounds. A single round is a snapshot, the average is the better number.
Does my screen or mouse affect the result?
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Yes, a little. A 60 Hz screen shows a new frame every 16.7 ms, and a gaming monitor at 144 Hz every 6.9 ms. Mouse, wireless connection and browser add a few more milliseconds. Compare your times on the same setup rather than across devices.
What happens if I click too early?
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The round is discarded and marked as too early. It is not counted as zero or as a fast time, so you cannot improve your average by guessing.
How is the time measured?
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The clock starts on the first frame where the green is actually painted on screen and stops when your click arrives, using the browser's high-resolution timer.
Can I take the test on my phone?
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Yes. Tapping the box works like clicking. Touchscreens add their own small delay, so phone results are usually a little slower than a mouse on the same person.
Test your reaction time now
Free, no account needed.