Reaction Time Test

Click the moment the box turns green and find out how quick your reflexes really are.

  1. Click the box to begin. It turns red.
  2. Wait. Don't click until it turns green.
  3. Click as fast as you can. Repeat five times for your average.
Click to startFive tries, then you get your average.

Average
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Fastest
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Your best average
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Seizure warning

The box changes colour suddenly. If you are sensitive to flashing light or colour changes, take care using this test.

How the reaction time test works

After you start a try, the box waits a random time between about one and a half and four and a half seconds, then turns green. The time from green to your click is your reaction time, in milliseconds (thousandths of a second). Clicking before it turns green counts as a false start and that try is repeated.

Your result includes small delays from your mouse, screen and browser, typically 10 to 50 ms in total. A gaming mouse and a high refresh rate screen help a little; check yours with the refresh rate test.

What's a normal reaction time?

Frequently asked questions

Can I use the keyboard?

Yes. Click the box once, then press Space or Enter instead of clicking.

Why are my phone results slower?

Touch screens and phone displays usually add more delay than a mouse and monitor, so scores are often 20 to 60 ms slower.