Studies consistently place the average human visual reaction time at around 250 milliseconds — roughly a quarter of a second. World-class athletes, esports players and fighter pilots typically clock in between 170 and 200 ms. Below 150 ms is exceptional; below 100 ms is almost certainly measurement error (or an early guess).
What are you actually measuring?
A reaction time test measures a chain: photons hit your retina → signal travels to visual cortex → decision is made → motor command is issued → finger presses button. There's a hard biological floor around 100 ms that no amount of practice will break.
Ways to improve
- Sleep. A single night of poor sleep can slow reaction time by 30–50 ms.
- Caffeine. Roughly a 20 ms improvement, peaking about 45 minutes after intake.
- Practice. Familiarity with the stimulus and motor pattern matters more than raw neuron speed.
- Warm up. Your first attempt is almost always your worst — always take 3 to 5 test runs before recording a personal best.
Try our test
TimeStopwatch's Reaction Time Test uses randomised delays (to prevent anticipation) and stores your last 10 attempts locally so you can see whether that morning coffee is actually doing anything. Sub-200 ms consistently? You're in the top few percent — nice reflexes.