Reaction Time Test
Measure how fast you react, in milliseconds. Click the moment the box turns green, run as many rounds as you like, and see your average, median and best.
A reaction time test measures the gap between a visual cue appearing and you responding to it. The box turns green at a random moment, you click, and the gap is recorded in milliseconds. The median adult scores about 273ms on a simple click test; anything under 200ms is fast and under 150ms is close to the physical limit, because roughly 80ms of every score is nerve signal and screen latency you cannot train away.
Runs entirely in your browser · no signup · nothing is uploaded · updated 2026-09-16
How to use it
- 1.Click the box once to arm the test, then wait - the delay is random so you cannot time it.
- 2.Click the instant it turns green. Clicking while it is still red counts as a false start.
- 3.Run five or more rounds. Read the median rather than the best, since one lucky round is not your reaction time.
What your score means
Simple visual reaction, measured by click. Scores include display and input latency, so the same person tests 10 to 40ms slower on a laptop trackpad than on a wired mouse.
| Score | Band | Roughly |
|---|---|---|
| Under 150ms | Elite | Top 1%, and near the physiological floor |
| 150 to 199ms | Very fast | Regular competitive gamer |
| 200 to 249ms | Fast | Comfortably above the median |
| 250 to 299ms | Average | The median adult sits near 273ms |
| 300 to 399ms | Below average | Common when tired or on a trackpad |
| 400ms or more | Slow | Usually distraction or hardware, not you |
Frequently asked questions
What is a good reaction time?
Under 250ms is good and under 200ms is genuinely fast. The median adult clicks at roughly 273ms on a simple visual test, so beating 250 puts you ahead of most people who try it.
What is the average human reaction time?
About 273ms for a simple visual cue clicked with a mouse. Sound cues are faster, around 170ms, and touch is faster still, because audio and touch signals reach the brain through a shorter path than vision.
What is the fastest possible reaction time?
Around 100 to 120ms for a trained person on good hardware. Below that you are anticipating rather than reacting: the retina alone takes about 20 to 40ms to send the signal, and the muscle takes another 30 to 50ms to move the finger.
Why is my reaction time worse than usual?
Sleep debt, alcohol, a busy browser tab and a wireless mouse all cost 10 to 50ms each. Age matters too - reaction time is fastest in the early twenties and slows by roughly 2 to 3ms per year after about thirty.
Does the test measure my monitor as well as me?
Yes, and there is no way around that. A 60Hz display adds up to 16ms of uncertainty on its own, and a wireless mouse adds a few more. Compare scores on the same machine rather than against a friend on different hardware.
Can I improve my reaction time?
Somewhat. Practice, caffeine and being well rested reliably move most people 10 to 30ms, and that is mostly learning the task rather than a faster nervous system. The underlying signal speed barely changes.
Should I use my average or my best score?
The median. Your best round is usually a near-miss false start that happened to land after the cue, while the median across five or more rounds is the number that actually repeats.
Does this test store my results?
No. Everything runs in your browser, nothing is uploaded, and your scores disappear when you reload the page.
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