Reaction Time Test
How fast can you respond to the colour change?
Reaction test
Wait on the red screen, then click the moment it turns green.
Result
Monitor refresh rate and mouse type can shift results by tens of milliseconds.
Typical visual reaction time is 200 to 250 milliseconds — most of which is nerve signalling, not decision-making. Anything under 150ms almost certainly means you anticipated rather than reacted.
How to use
- 1 Click to start, then wait on the red screen.
- 2 Click the instant it turns green.
- 3 Clicking too early restarts the round.
- 4 Repeat a few times — the average is more meaningful than one attempt.
Frequently asked questions
What is a good reaction time?
200–250ms is typical. Around 180ms is quick, and consistently under 150ms is unusual for a simple visual cue. Athletes in reaction-dependent sports sit at the fast end.
Why does my score vary so much?
Attention fluctuates constantly. Fatigue, caffeine, time of day and how recently you were distracted all move it by tens of milliseconds. That is why the average over several rounds is the number worth looking at.
Does my hardware affect the result?
Yes, by 20 to 50 milliseconds. Monitor refresh rate, input lag and whether the mouse is wireless all add delay. Comparisons are only fair on identical setups.