Reaction Time Test
A visual reaction-time benchmark: the panel turns from red to green after a random wait, and you click the instant it changes — the tool records how many milliseconds your eye-to-finger loop took.
Measure your visual reaction time in the browser — wait for the panel to turn green and click the instant it does, with best, median and mean over five rounds.
Steps and notes
What is Reaction Time Test?
Human visual reaction time to a simple stimulus is typically around 200–300 ms; trained players push below 200 ms, and readings far under 150 ms almost always mean the click was a guess timed against the wait rather than a genuine response. This test uses the same randomised-foreperiod design serious reaction rigs use, because a predictable delay measures anticipation, not reaction.
- Press Start — the panel turns red and shows "Wait for green…"
- After a random 1.2–4.5 s delay (unpredictable on purpose) the panel turns green
- Click the panel (or press Space/Enter) the instant it turns green; the reading appears in milliseconds
- Clicking while it is still red voids the round — that filters guessing out; repeat for up to five rounds and compare best, median and mean
- The timer starts on the frame where the green panel is actually painted, not when the internal alarm fires — a few milliseconds stricter, and the honest baseline for comparing your own runs
- Every reading carries overhead you cannot remove: monitor refresh, browser event handling and mouse polling add roughly 5–80 ms depending on hardware, so compare between your own runs, not against someone else's screenshot
- Touchscreens and mice measure slightly different loops; results live only in the page — nothing is uploaded, and a refresh clears the session
Frequently asked questions
- What is a normal reaction time?
- For sight-to-click on a desktop setup, roughly 200–300 ms is typical for adults; consistent sub-200 ms is rare and usually reflects practice on this exact task.
- Why is my result over 500 ms?
- Distraction, a loaded or power-saving device, a slow display, or simply not trying to be fast. Close other workloads and run five rounds — the best round characterises you, the median characterises your day.
- Can I train myself faster with this?
- You will reliably get better at this test — that is practice on the task, not a general speed upgrade. Treat improvements as real within your own history and be sceptical of claims beyond it.
- Does the random wait matter that much?
- Yes. With a fixed delay you are timing an anticipated motor program, which can produce sub-150 ms readings that are not reactions at all. Randomising the wait forces genuine stimulus-driven responses.
Category: Measurement