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Reaction time test

Average
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Best try
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Best
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How fast are your reflexes?

Tap the box, wait for green, then tap or press Space as fast as you can. Your reaction time is the time from the green to your tap, in milliseconds (ms). After 5 tries you see your average and your best. A tap before the green, or less than 100 ms after it, is a false start and does not count.

How the reaction time test works

  1. Tap the box. It turns red.
  2. Wait. After 1.5 to 4.5 seconds, at a random moment, it turns green.
  3. Tap the box or press Space as fast as you can. The box shows your time in milliseconds.
  4. Do it 5 times. Your result is the average of the 5 tries.

A tap on red, or less than 100 ms after the green, is a false start: the try does not count, and you do it again. A try with no tap within 2 seconds does not count either.

What your time means

Your reaction time is the time your eyes, your brain and your hand need to answer the green, plus the delay of your screen and your mouse, keyboard or touch screen. Human Benchmark, which runs the best known test of this kind, says that a computer can add 10 to 50 ms, so compare times on the same device.

One try says little: your times change from try to try. That is why the result is the average of 5. Your best average stays in this browser.

Tips for a faster time

  • Rest your finger on the mouse button or the spacebar before the box turns red.
  • Look at the middle of the box, and don't guess: a guess is often a false start.
  • Use a mouse or a keyboard if you can: taps on a phone tend to be a bit slower than clicks.

Test your hands next with the CPS test, or your aim with the aim trainer.

Questions

What is a good reaction time?

Human Benchmark has recorded more than 81 million clicks on a test like this one, and its median is 273 ms: half of the clicks were faster. Its notes say that a computer and its screen can add 10 to 50 ms to a reaction.

Why does a tap under 100 ms not count?

The eye, the brain and the hand need more time than that to react, so a tap that fast is a guess. Sprinting uses the same limit: World Athletics calls a reaction under 0.1 seconds after the gun a false start.

How does the test measure the time?

The clock starts on the frame that shows the green and stops at your tap or key press, both on the event clock of your browser. Like every test in a browser, the time includes the delay of your screen, mouse or touch screen.

Why am I slower on a phone?

Human Benchmark notes that taps on a phone tend to be a bit slower than mouse clicks, and every screen has its own delay. Compare your times on the same device.

How can I get a better score?

Rest your finger on the mouse button or the spacebar, and keep your eyes on the box. A wired mouse and a fast screen add less delay. Your times change from try to try, so the average of 5 says more than one try.

Is the reaction time test unblocked? Does it work on a school Chromebook?

It is a normal web page on lifesim.com with nothing to download, so it runs in Chrome on a Chromebook. Some school filters block every game site, so we can't promise that yours allows it. Once the page is open, the test needs no network.

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