Is 200 ms a Good Reaction Time? What Every Number From 100 to 400 ms Means

These bands apply to a simple visual reaction test — one signal, one click — taken in a browser. Each verdict is anchored to a cited study; none of them is a made-up percentile.

Yes, and comfortably so. Woods et al. (2015) measured simple visual reaction time in 1,469 adults aged 18 to 65 and reported two averages: 231 ms as recorded, and 213 ms once the delay of the display and input device was removed. Their youngest band, 18 to 24, averaged 217.8 ms. A genuine 200 ms is faster than all three.

The one figure it does not beat is the classic laboratory reference for college-age adults, around 190 ms (Jain et al. (2015)) — measured with dedicated equipment and none of the lag a browser adds. Which brings us to the catch.

250 ms is roughly average. It sits 19 ms above the measured adult mean of 231 ms — about what a 60 Hz office monitor, a touchscreen, or a poor night of sleep costs. In the same study, four decades of aging cost only about 21 ms (Woods et al. (2015)), so a 250 ms result on a slow setup and a 230 ms result on a fast one may well be the same person.

300 ms is slow for a simple visual test — nearly 70 ms above the measured mean — but it is not automatically a verdict on your reflexes. It is common on phones, on a first attempt, and at the end of a screen-heavy day. It is also perfectly normal on tests that make you decide before you respond: across more than 7,000 UK adults, Der & Deary (2006) found choice reaction time both longer than simple reaction time and steeper in its decline with age. If your 300 ms came from the Go/No-Go test, compare it with other Go/No-Go results, not with this table.

They come from the same participants. Woods et al. (2015) recorded 231 ms on their apparatus, then estimated how much of that was the screen and the button rather than the human, and subtracted it: 213 ms. When a site quotes an "average" without saying which one, or quotes 250 or 284 ms with no source at all, it is decoration, not data.

For your own result the rule is simple: a browser test measures you plus your hardware, exactly as the study's raw figure did. So compare against 231 ms, not 213.

Display latency, refresh rate, browser scheduling and mouse or touchscreen lag add roughly 20 to 50 ms to whatever your nervous system does. That spread is larger than the whole 18-to-65 age effect, and it is why the brackets above are wide rather than exact. A 144 Hz monitor with a wired mouse will read 20 ms or more faster than a laptop trackpad — for the same reflexes.

State matters too. Sleep, alertness, caffeine and time of day all shift results between sessions, and reactions to sound are systematically faster than reactions to light (Jain et al. (2015)), so an auditory result belongs on a different scale from a visual one.

1. Take the average reaction time test at least five times and use the average. One fast click is often anticipation; one slow click is often distraction.
2. Read the verdict against 231 ms, the measured mean, because your browser number includes hardware lag just as the study's raw figure did.
3. Retest on the same device every few weeks. Your trend is the signal; the difference between your setup and someone else's is noise.

Curious how much age really moves the number? Less than you think — the cited figures by age are in their own guide.