About this test
The reaction time test measures the delay between the screen turning green and your click or key press. It uses the browser's high-resolution event timestamps, so the result includes your own reaction plus a small amount of mouse, display and system latency. Clicking before the colour changes counts as too early and the round restarts.
How to use this test
- Click the box to begin and wait while it is red.
- As soon as it turns green, click or press Space.
- Repeat five times. Your average and fastest time appear at the end.
Frequently asked questions
What is a normal reaction time?
Most people average 200–280 ms on a test like this. Below 200 ms is excellent; trained gamers often reach 150–180 ms.
Why is my score slower on this computer?
Monitor refresh rate, wireless mice and display processing add delay. A 144 Hz screen and wired mouse can improve results by 10–30 ms.
Can I improve my reaction time?
Sleep, warm-up and practice help a little. Hardware with low input lag removes avoidable delay.