Reaction Time Test
Click the screen as soon as it turns green. We'll measure your reaction speed in milliseconds.
Ready to test your reaction time?
Click anywhere in the box to begin. When the screen turns green, click as fast as you can.
What Is Reaction Time?
Reaction time is the interval between a stimulus and your response. It measures how quickly your brain processes information and sends signals to your muscles. The average human reaction time to visual stimuli is 200–250 milliseconds. Professional gamers and F1 drivers often score between 150–180 ms.
How Does This Reaction Time Test Work?
Our test uses a simple visual cue: the screen changes from red to green. Your task is to click as soon as you see green. We run 5 trials and calculate your average, removing any early clicks (false starts). The test measures simple visual reaction time — the most common type used in sports science and cognitive research.
Average Reaction Time by Age
Reaction time naturally slows with age. Here's what research shows:
- 18–25 years: 200–230 ms (peak)
- 26–35 years: 210–250 ms
- 36–45 years: 230–270 ms
- 46–60 years: 250–300 ms
- 60+ years: 280–350 ms
What Affects Reaction Speed?
- Sleep: Lack of sleep can slow reactions by 20–40%
- Age: Reaction time increases roughly 2–4 ms per year after age 25
- Exercise: Regular physical activity improves cognitive processing speed
- Caffeine: Moderate caffeine intake can improve reaction time by 10–20 ms
- Device: Mobile touch response is typically 20–50 ms slower than desktop clicks
How to Improve Your Reaction Time
Regular practice is key. Try our Aim Trainer to build hand-eye coordination, or test yourself daily to track improvement. Staying hydrated, getting enough sleep, and reducing screen fatigue all contribute to faster reaction times.
Frequently Asked Questions
What is a good reaction time?
Anything under 250 ms is above average. Under 200 ms is excellent. The world record for visual reaction time is approximately 100–120 ms, but this approaches the biological limit of human neurons.
Can reaction time be trained?
Yes, but with limits. Regular practice on reaction-based tasks can improve your score by 20–40 ms. However, genetics and age set your baseline — most people can't consistently go below 150 ms.
Why did I get a very low score on one trial?
If you clicked before the screen turned green, we count it as a false start and exclude it from your average. This ensures your results reflect genuine reaction time, not lucky guesses.