Reaction Time Test

What Is Reaction Time?

Reaction time is the amount of time between seeing a stimulus and starting a response. This test measures simple visual reaction time: you wait for the screen to turn green, then click as quickly as possible. Learn more about reaction time .

How Does the Test Work?

The test starts with a red screen. Wait for it to turn green, then click immediately. Your reaction time is recorded in milliseconds (ms).

Lower times are faster.

What Does Your Score Mean?

Your score shows how quickly you reacted during that attempt. There is no single “perfect” reaction time because results can be affected by the computer, display, browser, mouse, and other equipment.

For the most useful comparison, try the test several times using the same device and compare your results.

What Can Affect Your Result?

• Attention: Distractions can slow your response.
• Fatigue: Being tired can affect reaction speed.
• Equipment: Your display, mouse, browser, and computer can affect measured timing.
• Practice: Familiarity with the test can improve your performance.