About the Reaction Time Test
Reaction time — the interval between a stimulus appearing and your response — is one of the most fundamental measurements in human performance science. It has been studied since the 1860s, when Francis Galton built mechanical apparatus to test reaction times at London's International Health Exhibition. Today it's used to benchmark performance in professional sports, military recruitment, clinical neurology, and gaming.
This test measures simple visual reaction time: the screen turns green, and you click as fast as possible. The speed of this response depends on your visual processing speed, neural transmission speed, and motor execution speed — a chain that spans from your retina to your fingertip. The average human completes this chain in about 250 milliseconds — roughly a quarter of a second.
How the Test Works
Click the panel to begin. The screen turns red and shows "Get ready..." After a random delay of 1–4 seconds, the screen turns green — click immediately. Your reaction time is measured in milliseconds from the moment it turns green to when you click. The random delay prevents anticipation (clicking before the signal appears). Complete 5 rounds and receive your average, best, and worst times.
- If you click too early (before green), it counts as a false start — wait for it to reset and try again
- The delay is randomised each round to prevent rhythm-based anticipation
- Use the same finger each time for consistent results
- Desktop mouse clicks are typically slightly faster than touchscreen taps due to physical mechanics
Reaction Time Benchmarks
- Under 150ms: Exceptional — rare outside professional esports athletes and elite sportspeople. Likely involves some anticipation on screen-based tests.
- 150–200ms: Elite — top 5% globally. Typical of professional gamers and trained athletes.
- 200–250ms: Fast — above average. Regular gamers, competitive sports players, and young adults typically fall here.
- 250–300ms: Average — the normal range for most adults aged 18–40.
- 300ms+: Below average — common with fatigue, distraction, age, or being new to reaction tests. Improves quickly with practice.
What Affects Your Reaction Time?
Reaction time is highly sensitive to your current state. Sleep deprivation adds 50–100ms to average reaction times — comparable to the effect of alcohol intoxication. Caffeine improves it by 10–30ms. Age increases it gradually after 24: the average 70-year-old reacts about 100ms slower than the average 20-year-old. Gaming regularly — particularly fast-paced action games — has been shown to improve simple and choice reaction time by 10–20% over several months of play.
Frequently Asked Questions
What is a good reaction time?
Under 250ms is above average. Under 200ms is excellent (top 5%). The average adult scores between 230ms and 280ms. Professional esports players average around 180–220ms in real-game conditions.
Why do I sometimes click before the screen turns green?
This is called anticipation — your brain predicts when the signal will come based on learned timing, rather than reacting to the signal itself. The random delay (1–4 seconds) is designed to disrupt this. A false start resets the round.
Can I improve my reaction time with practice?
Yes — research shows that reaction time training produces real improvements, primarily in neural efficiency and attention. Playing this test regularly, alongside action video games and sports, typically produces improvements of 10–25ms over weeks of consistent practice.
Is touchscreen slower than mouse?
Yes — touchscreen taps are typically 20–40ms slower than mouse clicks on this type of test, due to the physical mechanics of the tap gesture and touchscreen detection latency. Compare your scores on the same device for consistency.