Average Human Reaction Time
Around 210–230 ms in a lab — and why your browser will tell you something slower.
Play Reaction Time TestFree, no signup — measure your score in seconds.The average is about 210–230 ms in the lab
The most solid modern number comes from Woods and colleagues (2015), who ran a simple visual reaction-time test on 1,469 people and got a mean of 231 ms — 213 ms once they corrected for their own equipment's lag. That puts the defensible range for a healthy adult reacting to a visual cue at roughly 210–230 ms, under laboratory conditions, with research-grade equipment built to add almost no delay of its own.
Why a browser test reads slower
A lab study uses equipment designed to add as little delay as possible between the stimulus and the measurement. A browser test can't do that. A 60 Hz screen only redraws every 16.7 ms, so a cue that's ready in software can sit unshown for part of a frame before you ever see it — on average about half that interval, and the full 16.7 ms in the worst case. A 144 Hz display cuts the worst case to 6.9 ms. Your mouse adds more: at 125 Hz polling it can hold a click for up to 8 ms before reporting it, where a 1000 Hz mouse reports within about 1 ms. None of that gets subtracted from your score, because a web page has no way to see your hardware.
That's the honest explanation for why Human Benchmark's own published crowd median sits at about 273 ms — a real, citable number, but a web-test number. It's measuring the same reaction plus a slice of hardware delay that a lab test is specifically built to remove. Compare it to the 210–230 ms lab figure and you're mostly looking at the size of that slice, not a difference in human reflexes.
What actually changes your reaction time
- Age. Simple reaction time — the kind measured here — holds up until roughly 50, then slows by about half a millisecond a year. Choice reaction time, where you pick between responses, starts slipping earlier, around your mid-twenties, by roughly 1.6 ms a year (Der & Deary, 2006, n = 7,130; Thompson, Blair & Henrey, 2014, n = 3,305 StarCraft II players).
- Sleep. Being awake for 17 to 19 hours impairs performance about as much as a 0.05% blood alcohol level, in a study that measured the two conditions directly against each other (Williamson & Feyer, 2000).
- Caffeine. The pooled effect across studies is small — g ≈ 0.28 — and it doesn't show up reliably in every trial. Real, but modest.
None of these move the number by much compared with the gap between a lab test and a browser test. If you want a comparison that means something, the fairest one is your own past score, on the same device.
What we got wrong before
This page used to say trained gamers and athletes often reach 150–180 ms, and repeated a 138 ms figure attached to a specific pro player. Neither holds up. That 138 ms number traces to one self-reported click on a livestream, not a measurement. And when esports players are tested properly, on standardised equipment, they come back at roughly 220–290 ms, with the most careful studies finding no significant difference from trained athletes who don't play competitively at all (Saygı & Odabaş, 2023; Bickmann et al., 2021). We're removing both claims rather than keep repeating them.
Frequently asked questions
What is the average human reaction time?
About 210–230 ms to a simple visual cue, under laboratory conditions — the mean from Woods et al. (2015), based on 1,469 people. Browser-based tests, including this one, typically read slower because display and input lag are baked into the number and can't be subtracted out.
Why is Human Benchmark's median 273 ms if the lab average is lower?
Because 273 ms is a web-test figure — it includes whatever delay your screen and mouse add, which a lab study is specifically built to avoid. It's a legitimate number, just not a measurement of the same thing as the lab studies. It tells you about typical web-test conditions, not about human reflexes stripped of hardware.
Do trained gamers and athletes really react at 150–180 ms?
No — that figure doesn't hold up, and we used to repeat it here. Standardised testing of esports players finds roughly 220–290 ms, and the most rigorous studies find no significant difference from trained non-gaming athletes tested the same way (Saygı & Odabaş, 2023; Bickmann et al., 2021).
Does reaction time get slower with age?
Yes, but later and more slowly than most people assume. Simple reaction time is roughly flat until about 50, then slows by around half a millisecond a year. Choice reaction time — picking between responses — starts declining earlier, in your mid-twenties (Der & Deary, 2006; Thompson et al., 2014).
Does sleep actually affect reaction time?
Yes, measurably. Being awake for 17 to 19 hours straight impairs performance about as much as a blood alcohol level of 0.05%, according to a study that compared the two conditions directly (Williamson & Feyer, 2000).
Does caffeine improve reaction time?
A little. The pooled effect across studies is small (g ≈ 0.28) and doesn't show up reliably in every trial. It's a real but modest effect, not a guarantee.