Reaction Time Test

Test your reflexes: click when the box changes colour, 5 tries, average in ms

Reaction time test

Works with the mouse, touch, or the Space bar. Early clicks never count against you.

Your best scores

Best average: -
Best single: -

Your mouse, keyboard and screen add roughly 10 to 50 ms of delay, so results vary between devices. Scores are saved in this browser only.

This reaction time test measures how quickly you respond to something you see. Click the box to start, wait while it stays neutral, and click the moment it turns to the accent colour. The wait is random, between 1.5 and 5 seconds, so you cannot anticipate it, and clicking early shows a too soon screen without counting against you. The clock starts on the frame that paints the new colour, not when the timer fires, and stops at the exact time of your click or Space press. After five attempts you get your average and your best single reaction, both saved in this browser, and a comparison with the commonly quoted human average of around 250 ms. Treat that figure as typical rather than precise: age, fatigue, caffeine, and the lag of your mouse and screen all shift the result.

How to Use

1Click the box or press Space to begin
2Wait while the box stays neutral; clicking early shows Too soon
3Click or press Space as soon as the box changes colour
4Repeat for 5 attempts and read your average and best time

Frequently asked questions

What is the average human reaction time?

For a simple visual signal and a mouse click, results typically fall around 200 to 300 ms, with about 250 ms often quoted as the average. Sound is usually a little faster to react to than light.

What is a good reaction time?

Anything under about 250 ms on this kind of test is better than typical. Averages around 200 ms are quick, and consistently under 170 ms is exceptional. Compare your averages rather than a single lucky click.

Why are my results different on another device?

Each device adds its own delay. A 60 Hz screen, a wireless mouse, a slow keyboard or a phone touch screen can each add several milliseconds, so the same person scores differently on different hardware.

How can I improve my reaction time?

Sleep, regular practice and staying alert help most. Moderate caffeine can shave a few milliseconds, while fatigue and alcohol slow you down. Practising games that demand fast responses also helps a little over time.

Does age affect reaction time?

Yes. Reaction time tends to be fastest in the late teens and twenties and slows gradually with age, though practice and fitness narrow the gap.

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Reaction Time Test