User Guide
- Click the panel to start — it turns red, meaning wait.
- The instant it turns green, click as fast as you can. Clicking early restarts the round.
- Complete 5 rounds to get your average, plus your session best and all-time best.
- Compare against the benchmarks: the average human visual reaction time is about 250 milliseconds.
About the Reaction Time Test
This test measures your visual reaction time — the milliseconds between seeing the panel turn green and your click registering. It runs five rounds and averages them, because a single reading proves nothing: one lucky anticipation or one blink swings the number by 100 ms. The five-round average is the figure that actually describes your reflexes.
Why reaction time is worth knowing
It’s not just a game stat. Driving: at 60 km/h your car covers 16.7 metres every second — the difference between a 250 ms and a 400 ms reaction to a child stepping out is 2.5 metres of extra travel before you even touch the brake. Alertness check: reaction time degrades measurably with sleep deprivation, so a quick test before a long night drive is a genuine self-check — if you’re testing 100 ms above your normal average, you’re more tired than you feel. Gaming: in shooters and MOBAs, a 50 ms edge is the difference between trading and winning a duel. Sport: sprinters are flagged for a false start under 100 ms because science says no human reacts that fast — a fun bar to test yourself against.
What’s a good score? The benchmarks
The population average for a visual stimulus is around 250 ms. Under 200 ms is excellent (competitive-gamer territory), 200–270 ms is sharp, 270–350 ms is normal, and above 400 ms usually means fatigue or distraction rather than slow reflexes. An F1 driver launching off the start lights operates around 200–250 ms — test yourself five rounds and see how you compare on the same scale.
How to test fairly (and improve)
Use the same device each time — monitors and touchscreens add their own fixed delay of 10–50 ms, so cross-device comparisons mislead. Test at the same time of day, sit close, and keep your finger resting on the button. Improvement is modest with practice, but the big levers are sleep, alertness and caffeine; age slows reactions gradually (roughly 2–6 ms per decade in adulthood). Clicking before green is caught as a false start and never counts — anticipation isn’t reaction.
Pair it with the CPS Test to profile both halves of your input speed: how fast you start, and how fast you keep going. The test is free, runs entirely in your browser, and stores only your all-time best — locally on your device.
Frequently Asked Questions
What is the average human reaction time?
About 250 milliseconds for a visual stimulus. Most people land between 200 and 300 ms; trained gamers and athletes often test faster.
Why does the test use 5 rounds?
Single readings swing widely — a lucky anticipation or a blink changes everything. Averaging five rounds gives a much more reliable measure of your true reflexes.
Why is my score different on another device?
Monitors, touchscreens and mice each add their own input delay. Compare scores taken on the same device, not across devices.
Can I improve my reaction time?
Practice helps a little, but sleep, alertness and caffeine matter more day-to-day. Reaction time also naturally slows gradually with age.
What happens if I click before green?
The round flags a false start and restarts — anticipating the light is the classic way to cheat a reaction test, so early clicks never count.