Average Reaction Time
Short answer: simple visual reaction times in controlled adult studies often land in the low-to-mid 200 ms range, but there is no single universal “normal” browser score. Task design and hardware can move the number substantially.
Last reviewed: September 24, 2026.
What does research actually find?
A large calibrated study of 1,469 adults aged 18–65 reported a mean simple visual reaction time of 231 ms before hardware correction and 213 ms after correction. The same paper reviews other large studies with means ranging from roughly the mid-200s to well above 300 ms depending on apparatus and protocol. That spread is exactly why one website should not present a single number as a universal human norm.
Source: Woods et al., Factors influencing the latency of simple reaction time.
So is 200 ms a good reaction time?
A repeatable browser score around 200 ms is fast for a simple visual click task. A score around 250 ms is still in the same general range as many controlled adult measurements. But do not read a 20–30 ms difference as pure “brain speed”: display refresh, input devices, browser timing, anticipation and the exact task all matter.
What about 170 ms or 100 ms?
170 ms is very fast for a voluntary visual response and is worth repeating across multiple trials before interpreting it. A browser reading near 100 ms should be treated cautiously: anticipation, false starts or measurement conditions can contribute, and controlled research separates stimulus-detection and motor components that make an ordinary visual response more than a single instantaneous step.
Does reaction time change with age?
Yes, but the effect is gradual and depends on the task. In the Woods et al. sample, simple reaction time increased by about 0.55 ms per year of age across ages 18–65. Another study reported younger adults around 273 ms versus older adults around 315 ms in its visual task. These are study-specific results, not age cutoffs for an individual browser score.
Age study: Aging effects on visual reaction time.
Why browser scores differ from laboratory scores
Online testing adds the full consumer-device stack. Research using light sensors and controlled physical actuators has found that browsers and devices can introduce varying response-time overestimation. That means browser reaction tests are useful for repeated personal benchmarking, but absolute scores should be compared with care across different devices.
Timing study: Mental chronometry in the pocket?.
How ReactionMetric will answer “where do I rank?”
We will not invent a percentile from laboratory studies. Once enough users explicitly contribute sessions, ReactionMetric will publish its own browser-observed distributions with the sample size, collection window, test version and device cohort. Until then, your most defensible comparison is your own repeated five-trial sessions on the same setup.