Reaction time test
Wait for the screen to change color, then click as fast as you can. The test measures your reaction time in milliseconds.
- – games played
Measure your reflexes in milliseconds
This reaction time test measures the delay between a visual signal and your click. The principle is deliberately simple: the test area turns red, you wait, and it switches to green at a moment you cannot predict. You click as soon as you see green, and your result appears in milliseconds. One attempt takes a few seconds, so you can run ten of them in under two minutes.
Reaction time is one of the most studied measures in psychology and sports science. It depends on how alert you are, how tired you are and how old you are, but also on your hardware. This page gives you a precise number for each attempt and, more usefully, a history that shows how that number moves from one day to the next.
How the test works
Each reaction test works with a mouse, a touchpad or a touchscreen. Here is how an attempt goes:
- Click the area to start. It turns red.
- Wait for the signal: the switch to green comes after a random delay between 1 and 5 seconds. Counting in your head will not help you guess it.
- Click as soon as it turns green. The time is taken the moment you press the button down, not when you release it.
- Read your result in the window that opens, then start a new attempt with one click.
A few details worth knowing:
- Clicks on red are ignored. There is no penalty, but clicking repeatedly in the hope of landing just after the green spoils your history and your average. Your score only means something if you really wait for the signal.
- A beep plays when the area turns green if sound is on. You can mute it for a purely visual test. The two modes do not give the same times, as explained further down.
- If you do not click within 9 seconds of the green, the attempt is cancelled and the area goes back to the start screen.
- Full screen mode enlarges the area and removes every visual distraction around it.
Reading your result
After each attempt, the result window shows three values:
- Current: the time of the attempt you just made.
- Average: the mean of every attempt stored in your history.
- Best: your shortest time.
You also get a rating out of five stars, a level and a comparison with your earlier attempts: either a new record, or the percentage of your previous attempts you just beat. The history keeps your last 200 attempts, which you can view in order or sorted from fastest to slowest. It is stored in your browser, and you can clear it whenever you want a fresh start.
On any reaction time test, pay most attention to the average. A single 170 ms attempt can be luck, while an average of 210 ms over fifty attempts genuinely describes your reflexes.
Reaction time benchmarks
These are the thresholds behind the rating and level shown at the end of each attempt:
| Time | Level | Stars | What it means |
|---|---|---|---|
| 150 ms or less | Expert | 5 | Exceptional reflexes, or a slightly anticipated click |
| 151 to 200 ms | Very good | 4 | Common among well rested competitive gamers |
| 201 to 270 ms | Good | 3 | Where the large majority of adults land |
| 271 to 350 ms | Average | 2 | Fatigue, distraction or slow hardware |
| Over 350 ms | Beginner | 1 | Wandering attention or heavy device latency |
On online tests, the adult average sits around 250 ms, with most results between 200 and 300 ms. Reaction time is at its best roughly between the ages of 20 and 30, then rises slowly, by a few milliseconds per decade. A result under 100 ms is nearly always anticipation: the brain needs about 100 ms at the very least to perceive a signal and trigger a movement.
What the number really measures
The time displayed adds up two things: your biological reaction and the latency of your hardware. On the body side, light hits the retina, the visual cortex processes it, a decision forms and a command travels down to the muscles of your finger. On the machine side, the screen has to draw the green frame and the mouse has to send your click to the computer.
| Source of delay | Typical range |
|---|---|
| 60 Hz monitor (waiting for the next frame) | 0 to 17 ms |
| 144 Hz monitor | 0 to 7 ms |
| 240 Hz monitor | 0 to 4 ms |
| TV image processing outside game mode | 20 to 60 ms |
| Mouse polling at 125 Hz | Up to 8 ms |
| Gaming mouse at 1000 Hz | About 1 ms |
| Smartphone touchscreen | Often several tens of ms |
In practice, two people with identical reflexes can be 30 to 50 ms apart because of their equipment. That is why you should compare your results with each other, on the same device, rather than with a friend playing on a 240 Hz monitor. Wireless mice are no longer a problem in most cases: current gaming models are as fast as wired ones.
Visual or audio: why the beep changes your result
Reaction time to a sound is usually shorter than to a visual signal, often by 20 to 40 ms. Auditory information reaches the brain faster than visual information, which needs more processing. With the beep on, you are partly reacting with your ears. If you want to measure your visual reflexes alone, mute the sound. Either way, keep the same setting from one session to the next so your history stays comparable.
How to get a reliable score
A single reaction speed test attempt tells you very little. Natural variation from one try to the next easily reaches 30 to 40 ms, so the method matters as much as your fingers.
- Settle in properly: forearm resting on the desk, index finger lying on the left button with light pressure. You should not have to move your hand to click.
- Go full screen and look at the centre of the area. Your peripheral vision picks up the colour change too, so there is no need to stare at one exact point.
- Do two warm up attempts that you do not count.
- Run a series of five to ten attempts, then look at your average rather than your best time.
- Always test under the same conditions: same device, same sound setting, ideally at the same time of day.
Treat each session as a small reaction speed test protocol: same routine, same number of attempts, then a quick note of your average. After two weeks you will have a reliable baseline and you will spot good and bad days at a glance.
Simple and choice reaction time
This page measures simple reaction time: one signal, one response. Researchers also study choice reaction time, where several signals each call for a different response (press left for blue, right for yellow, for example). Choice reactions are much slower, often 350 to 450 ms, because the brain has to identify the signal before it picks the answer. Most real situations, from braking in traffic to winning a duel in a shooter, mix both. A simple test is still the cleanest way to isolate the raw speed of your nervous system and your hardware.
How to improve your reflexes
Simple reaction time improves less than people expect. With training, most people gain 10 to 30 ms, mostly because they learn to stay focused and cut down on bad attempts. The biggest swings come from your state on the day:
- Sleep: a short night can cost you 20 to 50 ms and make your results much less consistent.
- Warm up: your first attempts of the day are nearly always the slowest. A few minutes of activity wakes up your attention.
- Caffeine: in moderate doses, it slightly improves alertness for most people. The effect is a few milliseconds.
- Mental fatigue: after hours in front of a screen, your average creeps up. Test when you are fresh.
- Alcohol and some medications slow reflexes noticeably, sometimes by more than 50 ms.
Racket sports, shooters and rhythm games mainly train choice reaction time, which is more complex than what this page measures. They still have an indirect effect on your alertness and your ability to stay locked on a signal.
Common mistakes
- Spamming clicks on red: there is no penalty, but you end up with fake records that inflate your history.
- Judging on one attempt: the gap between two tries can be 30 to 40 ms without anything changing.
- Testing on a TV without game mode: image processing adds several tens of milliseconds.
- Comparing phone and computer: a finger tap on a smartphone is not comparable to a mouse click on a fast monitor.
- Keeping a tense hand: a stiff finger reacts more slowly than one simply resting on the button.
Why gamers check their reflexes
In shooters, fighting games and racing games, a few tens of milliseconds can decide a duel. A regular reflex test lets you check that your hardware is not slowing you down and spot the days when you are off form. If your average jumps from 200 to 260 ms one evening, it is not the night for ranked matches. Keep in mind that reaction time is only one part of performance: anticipation, positioning and game sense often matter more. A quick reflex test before a session is a cheap way to know where you stand.
Frequently asked questions
What is the average reaction time?
On an online reaction time test with a visual signal, the average is around 250 ms. Between 200 and 270 ms, you are in the normal range. Consistently under 200 ms, your reflexes are clearly above average.
Is a time under 100 ms possible?
Not as a pure reaction. Below roughly 100 ms, it is almost always anticipation or a random click that happened to land just after the green. If it happens, do not count it as a real record.
Why do my reaction test results vary so much?
Your attention fluctuates constantly, and the random delay before green surprises you more on some attempts than others. A gap of 30 to 50 ms between your best and worst attempt in a series is completely normal.
Does this reaction test work on a phone?
Yes, it responds to a tap on the screen. Expect higher times than with a mouse, though, because touchscreens add latency.
Is a reaction speed test the same as a reflex test?
In everyday use, yes: both names describe clicking as fast as possible after a signal. Strictly speaking, a reflex is an involuntary response, like the knee jerk, while clicking on green is a voluntary reaction.
Are my attempts saved?
Yes, your last 200 attempts are stored in your browser. Your average and your best time are calculated from that history.