What Is Reaction Time?Reaction time (RT) is the delay between the appearance of a stimulus and the initiation of a response. In large public datasets, the median visual RT is ≈ 273 ms, with an average around 284 ms.

How This Test WorksThe screen turns green at a random interval (1–5 s). Your browser records the exact time it changes colour and the exact moment you click, then subtracts the two to produce your RT in milliseconds. Note that display latency and input lag add a few extra ms to any online measurement.

Typical Human BenchmarksEveryday adults: 250–300 ms for visual cues.Trained esports players: often 150–200 ms with high-Hz monitors.Children & seniors: RT increases steadily after ~24 years old and again after ~60.Factors That Influence RTHardware specs (refresh-rate, response time, input device), viewing distance, fatigue, caffeine, and distraction all modulate performance. Higher refresh-rate displays (144 Hz+) shave 5–15 ms by reducing display lag.

Can You Train Reaction Time?Yes. Simple drills such as ball-drop catches, sprints with unpredictable start cues, or cognitive games can yield measurable gains in 4–6 weeks. Consistent sleep, hydration, and minimizing multitasking also help.

Average RT by Age (Quick Reference)Age rangeMedian RT10-19~240 ms20-29~250 ms30-39~260 ms40-49~270 ms50-59~285 ms60+~300 ms+Quick FAQQ: Does internet speed affect scores?A: Only indirectly. Input & display lag have a far bigger impact.

Q: Why are my scores slower on mobile?A: Touchscreens add ~50 ms of latency and often run at 60 Hz.

Q: Is sub-100 ms humanly possible?A: Not for purely visual RT; such numbers usually indicate measurement error or network latency mis-calibration.