Reaction Time Test
Test your reaction time online. When the box turns green, click or press space as fast as you can. Measure your reaction speed in milliseconds and see how you compare.
Why this tool
- Measures your reaction speed in milliseconds with high-precision browser timing.
- Shows your grade and percentile — find out whether your reaction time is fast.
- Tracks your best score and recent history right in your browser, no sign-up.
- Works with mouse click, the spacebar, or touch on mobile.
About reaction time
Reaction time is how long it takes you to respond to something you see. For a simple visual test like this one, the average human reaction time is roughly 250 milliseconds, and many people land between 200 and 300 ms. Anything under 200 ms is excellent.
Your score depends on more than your brain. Monitor refresh rate, mouse polling rate, browser performance and display latency all add a few milliseconds. To get a fair picture, run several rounds and look at your average and median rather than a single best click.
This is a fun self-test for measuring and improving your reaction speed. It is not a medical, diagnostic, or scientific assessment, and results should not be used to evaluate any health condition.
FAQ
- How do I test my reaction time?
- Click 'Click to start', wait for the box to turn green, then click or press the spacebar as fast as you can. The test measures the milliseconds between the green appearing and your click. Run several rounds for a reliable average.
- What is a good reaction time?
- For this kind of visual click test, around 250 ms is average. Under 200 ms is excellent, 200–250 ms is fast, and 250–300 ms is typical. Most people are not far from the average.
- What is the average human reaction time?
- The average human reaction time to a visual stimulus is about 200–250 milliseconds. Reaction to sound is usually a little faster than reaction to light.
- Why does my reaction time vary between attempts?
- Reaction time naturally fluctuates with attention, fatigue, and anticipation. Hardware also matters: monitor refresh rate, mouse polling, and browser load each add small delays. That is why we show your average, median, and standard deviation, not just one number.
- Does the test work on mobile?
- Yes. On a phone or tablet, tap the box instead of clicking. On desktop you can click with the mouse or press the spacebar.