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Reaction Time Test
How fast you react, averaged over five tries.
Free tools that run in your browser. Nothing you type, open or create is uploaded to NerdBible or anyone else.
Your past rounds
| When | Average | Best |
|---|
No rounds yet. Results of finished rounds are kept in this browser only.
Your time includes the delay of your screen, mouse or keyboard and browser, which varies by device, often by 10 to 50 ms. Compare results on the same device. The wait before the box turns black is random each time, so it cannot be predicted.
How to use it
- Click the box, tap it or press Space to start a try. The box turns grey.
- Wait. After a random pause the box turns black: click, tap or press Space as fast as you can.
- Do five tries for your average and best. Pressing before the box turns black is a false start and that try does not count.
Questions
Why do I get a different time on another device?
Every screen, mouse, keyboard and touch screen adds its own small delay, and so does the browser. Gaming monitors and wired mice are usually quicker than laptops, phones and wireless devices.
Is it fairer to click or press Space?
Use whichever you prefer, but stick to one, because a mouse, a keyboard and a touch screen each add a different delay.
Where are my results stored?
In this browser on this device only. Nothing is sent to NerdBible. Clear history removes them.
About this tool
About the reaction time test
How quickly can you respond to something you see? This test measures it in milliseconds over five tries and gives your average and your best.
How it works
- Click the box, tap it or press Space to start a try. The box turns grey.
- Wait. After a random pause the box turns black.
- Click, tap or press Space as fast as you can.
The pause is random every time, so it cannot be predicted. Pressing before the box changes is a false start and that try does not count.
Why your score varies between devices
The time measured includes more than your reflexes. Every screen, mouse, keyboard and touch screen adds its own small delay, and so does the browser, often 10 to 50 ms in total. Gaming monitors and wired mice are usually quicker than laptops, phones and wireless devices. Compare scores on the same device, and stick to one input, since a mouse, a keyboard and a touch screen each add a different delay.
Getting a fair reading
Sit comfortably, keep your finger resting on the button or key, and look at the centre of the box rather than at your hand. Do several rounds; the first is often slower while you get used to it. Being tired or distracted shows up quickly in the numbers.
Results are kept in this browser on this device only and are never sent to NerdBible. Clear history removes them.
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