Online Timer
Product of Stuon
Reaction Time Test
When the box turns green, click as fast as you can.
How the reaction test works
- Click the box (or press Space) to begin. It turns red: wait.
- After a random delay of 1.5–5 seconds it turns green. Click immediately.
- Your time is measured in milliseconds. Click before green and it's a false start — that try is repeated.
- After five good tries you get your average, which is a much fairer measure than a single lucky click.
What is a good reaction time?
| Average | Rating |
|---|---|
| under 200 ms | Excellent |
| 200–250 ms | Above average |
| 250–300 ms | Typical |
| over 300 ms | Slower — try again rested |
Results include your mouse, screen and browser delay (often 10–50 ms), so compare scores on the same device.
Frequently asked questions
What is the average human reaction time?
For a simple visual test like this, most people average around 200–300 milliseconds. Sleep, practice, and caffeine all affect it.
Does my device affect the result?
Yes. Screen refresh rate, mouse or touchscreen lag, and browser timing add a little delay. A 120 Hz screen and a wired mouse give the most accurate times.
Why does clicking early count as a false start?
Clicking before the green signal is guessing, not reacting. The test discards that try and gives you a fresh one.
Study smarter with Stuon
Take your focus further.
Turn what you learn into lasting knowledge with active recall, spaced repetition, and simple study tracking.
Continue on Stuon