Reaction Time Test
Click as soon as the box turns green
Test Your Reaction Time
Measure your reflexes in milliseconds
Click the box to start. It turns red – wait – and after a random delay of 1.5 to 5 seconds it turns green: click, tap or press Space as fast as you can. Your reaction time is shown in milliseconds; after 3, 5 or 10 tries you get your average, best and worst time, how consistent you were and how many times you clicked too early. The timer starts on the exact frame the green colour is painted and your input is captured on press (not release), so the result reflects your reaction as closely as a browser allows. Note that every screen and input device adds some latency (typically 10–50 ms), so compare results on the same device.
Features
Millisecond timing
Measured from the green frame
3, 5 or 10 tries
Average, best and worst
Consistency
Standard deviation of your tries
Touch & keyboard
Tap, click or press Space
Reaction Time Benchmarks
Average visual reaction time
- Under 200 ms: exceptional
- 200–250 ms: very fast
- 250–300 ms: average (most people ~250–280 ms)
- 300–350 ms: slightly slow
- Over 350 ms: slow or distracted
What affects it
- Sleep and fatigue
- Age — reflexes peak in the early 20s
- Caffeine and alertness
- Practice and warm-up
- Screen refresh rate and input lag
Frequently Asked Questions
What is a good reaction time?
The average human visual reaction time is about 250 ms. Under 200 ms is excellent; professional gamers and athletes are often around 150–200 ms.
Why is my result slower on my phone?
Touch screens, display refresh rates and browsers add latency. Results on different devices are not directly comparable; use the same device to track progress.
How is the reaction time measured?
The timer starts on the animation frame in which the green colour is painted and stops on your press (pointer down or key down), avoiding the delay of a full click.
Can I improve my reaction time?
Yes, to a degree: good sleep, staying alert, warming up and practice help. Games that train quick decisions can shave off a few milliseconds.
What does consistency mean?
It is the standard deviation of your tries. A small value (e.g. ±15 ms) means your reactions are steady; a large one means some tries were much slower.
What happens if I click too early?
The try is not counted and is shown as “Too soon!”. The number of early clicks is reported in your results.