Guide
How the Reaction Time Test Works
Wait for red to turn green, then respond instantly. Do it five times and read your average in milliseconds. Here is every step, the controls, how the score is built, and how to get a number you can trust.
Start the testThe steps
Four steps, about a minute
The test measures simple visual reaction time: one signal, one response, no decision in between. The clock runs only from the moment the panel turns green until your input lands. Everything before green — including the deliberately random wait — is never part of your score.
- 1
Start an attempt
Click, tap, or press Space on the panel. It turns red and shows "Wait for green". There is no countdown — the delay before green is random every time, from just over a second to about four seconds.
- 2
Wait for green
Hold still until the whole panel flips to green. If you click while it is still red, that counts as a false start and the attempt restarts — no time is recorded.
- 3
React the instant it turns green
The timer starts the moment the panel paints green and stops on your click, tap, or key press. Your reaction time in milliseconds appears straight away, with a quick read on how it compares.
- 4
Repeat five times for a score
Each attempt is added to the current round. After five clean attempts the panel shows your average — the number most people mean by "my reaction time" — plus your fastest single attempt.
Want the board now? Start the reaction time test and come back for the detail.
Controls
Mouse, touch, or keyboard
Every input does the same two jobs: it starts an attempt from the idle or result screen, and it records your reaction when the panel is green.
Mouse & touch
Click or tap
A left click anywhere on the panel, or a tap on a touchscreen, both start an attempt and register your reaction. Tapping the screen directly is usually the lowest-latency option on a phone or tablet.
Keyboard
Space or Enter
With the panel focused, Space or Enter does the same thing as a click. Keyboard timing is comparable to a wired mouse on most machines and avoids any pointer-acceleration quirks.
Sound
M
Press M to mute or unmute the cue sounds — a soft tick when an attempt arms, a bright tone on green, a short buzz on a false start. The setting is saved for next time.
Scoring & false starts
How the number is built
What is measured
Only the gap between the panel turning green and your input. The random wait before green is deliberately variable so it cannot be memorised or timed, and it is never part of your score.
False starts
Clicking, tapping, or pressing a key while the panel is still red ends the attempt with a "Too soon" message. Nothing is recorded; the next input simply arms a fresh attempt.
The round score
A round is five clean attempts. Your round score is their mean in milliseconds. Your best score is the single fastest clean attempt across the whole session, shown alongside the average.
What is saved
Your all-time best, total attempts, lifetime average, and a rolling history of recent times are stored locally in your browser so progress survives a reload. Clearing site data resets them.
What the numbers mean
Where your result sits
The most frequently cited median for this style of test is about 273 ms. These bands are orientation, not a diagnosis — one round is a snapshot, and a trend across many rounds is the real signal.
| Time | Rating | Notes |
|---|---|---|
| 1–119 ms | Too fast to be real | Under ~120 ms is quicker than the eye-to-finger signal can travel. This was almost certainly a lucky guess — wait for the green next time. |
| 120–199 ms | Elite | Near the floor of human visual reaction time. If every attempt looks like this, double-check you are not anticipating the green. |
| 200–249 ms | Excellent | The range competitive gamers and athletes tend to hit. Very few people are consistently here. |
| 250–299 ms | Above average | Faster than a typical result. Consistent times in this range are a genuinely quick reflex. |
| 300–349 ms | Average | Right around where most people land on a simple visual reaction test. |
| 350–449 ms | Below average | A little behind the pack. A short warm-up and a cleaner setup usually shave this down. |
| 450 ms and up | Room to improve | Slower than a typical result. Wireless input lag, a high-latency display, or a distracted moment can all add 50–150 ms — try again with a wired mouse and full attention. |
Typical result by age
Simple reaction time is stable through your twenties, then slows by a few milliseconds per decade. Fitness and sleep narrow the gap.
- 10–19
- 260 ms
- 20–29
- 268 ms
- 30–39
- 280 ms
- 40–49
- 292 ms
- 50–59
- 308 ms
- 60+
- 330 ms
Accuracy
What actually moves your number
The timer is high-resolution and re-stamped to the exact frame the panel paints green, so rendering lag is not counted. The rest is physics and attention.
Your display
The panel can only turn green on a screen refresh. At 60 Hz that is one frame every ~17 ms; at 144 Hz it is ~7 ms. Higher refresh rates and low-latency "game" modes give you a genuinely earlier signal.
Your input device
A wired mouse or a direct screen tap reports your click almost immediately. Bluetooth mice and some laptop trackpads buffer input, which can quietly add tens of milliseconds to every attempt.
The browser
This test uses a high-resolution timer and re-stamps the green moment to the actual paint, so it excludes rendering lag. A busy CPU or a heavy background tab can still cause an occasional slow frame.
You, on the day
Sleep, caffeine, time of day, and warm-up all move simple reaction time by 10–30 ms in either direction. A single session is a snapshot; a trend over many sessions is the real signal.
Common mistakes
Why a score looks wrong
Anticipating the green
The single biggest source of unrealistic times. Because the wait is random, guessing early either produces a false start or an impossibly low number that is not really a reaction at all.
Judging yourself on one attempt
Any individual attempt can be 80–100 ms off your true speed from noise alone. The five-attempt average exists precisely so one twitchy or sluggish click does not define your result.
Ignoring the hardware
A 60 Hz screen adds up to ~17 ms of display latency before you even see green; a wireless mouse adds more. If your number looks high, the setup is often the reason, not your reflexes.
Testing while distracted
Reaction time is an attention task. Music with lyrics, a conversation, or a notification popping in will all push the number up. Give the test the few seconds of focus it needs.
Cleaner results
Quick fixes before a round
For the full version, see how to improve your reaction time.
- Use a wired mouse or trackpad, or tap directly on a touchscreen — Bluetooth input can add 10–40 ms of lag.
- Close background tabs and apps so the browser can repaint the green panel without a stutter.
- Rest a finger lightly on the button and watch the centre of the panel, not the edges.
- Do a few throwaway attempts first; the first one or two are almost always slower.
- Do not try to time the green by counting — a false start wipes the attempt and adds frustration, not speed.
- Compare like with like: the same device, browser, and refresh rate from one session to the next.
Where you can take it
Same test on phone and desktop
Desktop and laptop
Works in any modern browser with no plugin. A wired mouse and a 120 Hz or faster monitor give the most repeatable numbers; keyboard input with Space is an excellent alternative.
Phone and tablet
The layout stacks so the panel and its instructions sit above the fold with nothing to scroll past. Tap straight on the panel — direct touch is typically faster than any external pointer.
Your saved progress
Best time, attempt count, lifetime average, and recent history live in this browser on this device. They are never uploaded, so a different device or a cleared cache starts fresh.
Still have a question? Read the reaction time test FAQ.
Start the test