Reaction Time Test
Test your reaction time online free: wait for green, click as fast as you can and get your average in milliseconds. Free online reflex test.
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Part of the toolkit
How to use Reaction Time Test
- 1Choose how many tries (1, 3, 5 or 10) and click the box or press Space to start
- 2When the box turns from blue to green, click (or tap / press Space) as fast as you can — clicking early is a false start
- 3After the last try you get your average and best reaction time in milliseconds
Frequently asked questions
What is a good reaction time?▾
The average visual reaction time is about 250 ms. Under 200 ms is very fast, and elite athletes and gamers often reach 150–180 ms.
Why is my reaction time slower on this device?▾
The result includes hardware latency: mouse or touchscreen polling, the monitor's refresh rate and input lag, often 10–50 ms in total. A high-refresh gaming monitor and wired mouse give lower numbers.
How can I improve my reaction time?▾
Sleep well, stay hydrated, warm up with a few tries and practice regularly. Caffeine and focus help a little; fatigue and distraction slow you down.
Why is the wait random?▾
The delay before green is random (1.5–5 seconds) so you can't anticipate it. Clicking before green counts as a false start and is not scored.
Embed Reaction Time Test on your website▾
Paste this snippet into your page. The embedded tool runs in your visitor's browser and shows a small “Powered by clkr.work” link.