How To Play the Reaction Time Test
Tap the box to begin. It turns red and tells you to wait. Keep your finger or mouse ready, but do not move yet.
At some random moment, the box flips to bright green and shouts TAP. Hit it as fast as you can. Your time for that try pops up in milliseconds, which are thousandths of a second. Tap again to start the next try.
You get five tries. The little bubbles at the bottom fill in as you go, so you always know how many are left. After the fifth one, you see your average, your fastest tap and your best average so far.
If you tap while the box is still red, you get a Too soon screen. That try does not count, so you just do it again. On a computer, you can click the box or press Space or Enter instead.
What Your Score Means
Scientists have measured simple reaction times for well over a hundred years. Lab studies where people react to a single light usually put a typical adult somewhere around 200 to 250 milliseconds. That is your eyes spotting the change, your brain deciding to move, and the signal racing down to your hand.
A test in a web browser adds extra delay that has nothing to do with you. Your screen only redraws a set number of times per second, and touchscreens, wireless mice and keyboards each take a little time to report a tap. Together, that can add tens of milliseconds. So treat your number as a fun score for this device, not a medical result.
Here is a rough way to read your average:
- Under 200 ms: seriously quick. Check that you were not guessing.
- 200 to 300 ms: a sharp, normal range for most people on most devices.
- 300 to 400 ms: a little slow. Tiredness, distractions or a laggy device can do this.
- Over 400 ms: you probably blinked, looked away or got a slow screen. Try again.
Tips To Improve
- Rest your finger on the screen or button. Starting from a hover saves precious milliseconds.
- Stare at the middle of the box. Do not watch the bubbles at the bottom while you wait.
- Do not try to guess the timing. The wait is random on purpose, and early taps just cost you a redo.
- Use a wired mouse or a fast screen if you want your best possible number.
- Play when you are awake and calm. Sleepiness, a heavy meal or a busy mind all slow you down.
Fun Facts About Reaction Speed
Reaction time experiments go back to the 1800s. Dutch scientist Franciscus Donders used them to try to measure how long thinking itself takes, and Francis Galton timed thousands of visitors at his London lab in the 1880s.
People usually react a little faster to a sound than to a light, which is one reason sprint races start with a starting gun or beep. Reaction times also tend to slow down gradually as people get older, while practice, good sleep and focus can help you squeeze out a few more milliseconds.
