Short answer: on an online "click when it turns green" test, 200 to 250 ms is a good reaction time, and 250 to 300 ms is normal. Under 200 ms is fast. In a lab, young adults react to a light in about 190 ms, but browser tests read higher because your mouse, computer and screen each add a few milliseconds.
Try it yourself with our reaction time test. It averages five tries, which gives a much fairer number than a single click.
Reaction time scale for online tests
| Average over 5 tries | Rating |
|---|---|
| Under 200 ms | Very fast |
| 200 to 250 ms | Good |
| 250 to 300 ms | Normal |
| 300 to 350 ms | A bit slow, often lag or tiredness |
| Over 350 ms | Check your setup, then retest |
These bands are for a simple visual test on a typical computer. They aren't medical or age norms. They're a practical way to read a browser score.
Why lab numbers are faster than yours
Research on simple reaction time puts college-age adults at about 190 ms for a visual signal and about 160 ms for a sound. Those numbers come from lab equipment built to add almost no delay.
At home, three extra delays stack up:
- The screen. A 60 Hz monitor draws a new frame about every 16.7 ms, so the green can appear up to that long after the test changes it. At 144 Hz, the wait drops to about 6.9 ms. Not sure what yours runs at? See how to check your monitor's refresh rate.
- The mouse. Wireless and older mice can add a little delay between your click and the computer seeing it.
- The computer. Busy browsers and background apps can slow how quickly the click is processed.
Together these can add several tens of milliseconds, which is why a 230 ms online score is genuinely good.
Is reaction time affected by age?
Yes. Processing speed gets faster through childhood into early adulthood, stays fairly stable for years, and slows gradually from middle age onward. A 45-year-old scoring 270 ms is doing just as well, relative to their age, as a 20-year-old scoring 240 ms.
How to get a fair score
- Close other tabs and heavy apps.
- Use a wired mouse if you have one.
- Do two warm-up rounds, then count the next five.
- Test when you're rested. Tiredness shows up quickly in reaction scores.
- Don't try to guess the timing. The test uses a random wait, and early clicks don't count.
Can you improve your reaction time?
Practice helps you get more consistent, and consistency lowers your average more than chasing one lucky fast click. Sleep, focus and a good setup make the rest of the difference. If you're into speed tests, the click speed test is a good partner to this one.
Sources
- Wikipedia: Mental chronometry (simple reaction time and age effects)
- Microsoft Support: Change the refresh rate on your monitor in Windows
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