⚡ Reaction Time Test

Free online reaction time test

This reaction time test measures how quickly you respond to a visual signal. Click the box to start, wait for it to turn green, then click as fast as you can. Your result is shown in milliseconds, along with your best time and your average across all attempts. Play a few rounds to get a more reliable picture of your reflexes than a single try can give.

How to take the test

1. Click the box to begin. It turns red while you wait.
2. Keep your finger ready. After a random delay of one to four seconds, the box turns green.
3. Click the moment you see green.
4. Your reaction time in milliseconds appears. Click again to try another round.

If you click while the box is still red, the round is cancelled with a "too soon" message. The delay is random so you cannot predict when the color will change.

What is a good reaction time?

Many people react to a visual signal in roughly 200 to 300 milliseconds. Times near 200 ms or lower are quick, and times above 350 ms are on the slower side. Your result in a browser also includes small delays from your screen, mouse and computer, so it will not match a lab measurement exactly.

What affects your reaction time

• Sleep and tiredness: being rested usually improves reaction speed.
• Focus: distractions and multitasking slow you down.
• Age: reaction times tend to change gradually with age.
• Equipment: a wired or high-quality mouse and a high refresh rate display can reduce lag.
• Caffeine and stress: these can raise or lower alertness, depending on the person.

Tips for faster results

• Sit comfortably and rest your finger lightly on the mouse button.
• Watch the whole box rather than staring at one spot.
• Do not anticipate. Guessing leads to false starts that waste rounds.
• Take the average of five or more attempts instead of judging by your best or worst one.

Frequently asked questions

Why is my time different every round?

Human reaction time naturally varies from one attempt to the next. That is why the tool shows both your best time and your average.

Is this test medically accurate?

No. It is a casual test for fun and practice. Screens, mice and browsers add delay, and it should not be used to diagnose any condition. See a doctor if you are concerned about your reflexes.

Does it work on a phone?

Yes, you can tap the box. Touchscreens often add a little extra delay compared with a mouse.

Is my data saved?

No. Your times are kept only while the page is open and are never stored or uploaded.