Reaction Time Test
Test your reflex speed with this free online reaction time test. Click as fast as you can when the screen turns green, then compare your result with global averages and track your improvement over time.
Reaction Time Test
Wait for green, then click as fast as you can.
How You Compare
Complete a test to see your ranking.
The chart above shows how your reaction time compares with other users. Most people score between 200ms and 300ms, with the global average around 250 milliseconds.
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About the Reaction Time Test
The reaction time test measures how quickly you can respond to a visual stimulus. When the screen turns green, click as fast as you can. Your reaction time is the number of milliseconds between the color change and your click.
What Is Reaction Time?
Reaction time is the interval between a sensory stimulus and your physical response. It reflects the speed of your nervous system, from the moment your eyes detect a change to the moment your brain processes it and your hand clicks. The average human reaction time to a visual cue is around 250 milliseconds.
Factors That Affect Reaction Time
- Age - Reaction time peaks in your mid-20s and gradually slows with age.
- Sleep - Fatigue and sleep deprivation can significantly slow your response.
- Focus - Distractions and multitasking reduce reaction speed.
- Practice - Regular training and gaming can improve reaction time over time.
- Device - Input lag from your mouse, monitor refresh rate, and display latency all add delay to your measured time.
How to Improve Your Reaction Time
Consistent practice is the most effective way to improve. Getting enough sleep, staying hydrated, and minimizing distractions during testing can also help. Many competitive gamers and athletes train their reaction time regularly to gain a performance edge.
More Cognitive Tests
Reaction time is just one measure of cognitive performance. Challenge yourself with our other tests to get a complete picture of your abilities:
- Sequence Memory Test - Watch and repeat a growing tile pattern
- Visual Memory Test - Remember positions on a grid
- Aim Trainer - Measure your precision and speed
- Number Memory Test - How many digits can you remember?
- Verbal Memory Test - Identify words you have already seen
- Typing Speed Test - Measure your words per minute
Keyboard Shortcuts
Frequently Asked Questions
What is a good reaction time?
The average human reaction time is around 250 milliseconds. A reaction time under 220ms is considered fast, under 170ms is exceptional, and anything above 350ms is below average. Factors like age, fatigue, and device input lag can all affect your results.
How do you test reaction time?
Click the test area and wait for the screen to turn green. As soon as you see the green screen, click as fast as you can. The time between the color change and your click is your reaction time, measured in milliseconds.
What factors affect reaction time?
Reaction time is affected by age (peaks in your mid-20s), sleep quality, focus level, practice, and your device hardware including mouse input lag, monitor refresh rate, and display latency.
Can you improve your reaction time?
Yes. Consistent practice is the most effective way to improve reaction time. Getting enough sleep, staying hydrated, reducing distractions, and regular gaming or athletic training can all help improve your response speed over time.
What is the fastest human reaction time?
The fastest verified human reaction times are around 120 milliseconds. Anything below 100ms in an online test is generally considered a false start or the result of anticipation rather than a genuine reaction.