Reaction Time Test

How to use it: click the panel, tap it or press SPACE to start. Wait for the panel to turn lime, then react as fast as you can. Five tries make one round, and your average is your score.

This free online reaction time test measures how many milliseconds it takes you to respond when the panel changes colour. Each round has five tries, and your average across them is your result. Most adults average somewhere around 200 to 260 ms, and an average under 200 ms is fast.

Test your reaction time with a mouse, a trackpad, a keyboard or a touchscreen. Nothing is installed or uploaded, and your best average stays saved in this browser so you can come back and try to beat it.

How to take the reaction time test

Click or tap the panel, or press SPACE or Enter, to start a try.
The panel turns dark red and asks you to wait. Keep your finger still and watch the centre.
After a random wait of 1.5 to 5 seconds, the panel turns lime.
Click, tap or press SPACE the moment you see lime. Your time in milliseconds appears straight away.
Repeat until you have five tries. The test then shows your average and saves it if it is your best so far.

If you react while the panel is still red, you see “Too soon!” and that try is thrown away. It is not added to your average, so guessing never helps. Just start the try again.

How this reaction speed test measures you

Think of it as a milliseconds test for your reflexes. The timer starts on the screen frame where the panel turns lime and stops when your click, tap or key press reaches the page. The test uses the browser’s high resolution timer, so the number you see is accurate to the millisecond for that device.

The wait before the colour change is random on purpose. With a fixed delay you could learn the rhythm and press before you actually see anything, which would measure timing and anticipation rather than reaction. A random gap between 1.5 and 5 seconds makes that impossible.

Five tries are averaged because single tries vary a lot. One blink or a wandering eye can add 100 ms to a try, while a lucky press can look superhuman. The average of five is a far more honest picture of your speed.

What is a good reaction time?

A large study of 1,469 adults aged 18 to 65 found an average simple visual reaction time of 231 ms, or about 213 ms once the delay of the computer’s screen and mouse was removed. The youngest group averaged roughly 218 ms. That gives a realistic way to read your own result:

Your 5 try average	What it means
under 180 ms	Exceptionally fast, or you are anticipating the change
180 to 200 ms	Very fast
200 to 260 ms	Normal for most adults on a home setup
260 to 320 ms	A bit slow, often tiredness, distraction or a slow screen
over 320 ms	Usually a sign that something else is slowing you down

These bands are a practical guide built around the study averages, not an official scale. Single tries below about 150 ms are rare and often come from pressing just before the change, so judge yourself on the average.

Why your score changes from device to device

Your result is your own reaction plus the delay of the hardware in between. In the study above, the screen and mouse together added about 18 ms, and slower setups can add a lot more. Common causes of a higher number:

The display. A 60 Hz screen shows new frames every 16.7 ms, while a 144 Hz or 240 Hz monitor shows the lime colour sooner. Some TVs and monitors also add processing delay unless game mode is on.
The input device. Wireless mice in power saving mode, Bluetooth keyboards and touchscreens can all add input delay.
The browser and computer. Heavy background tasks or many open tabs can delay events.
Phones. Touchscreens and mobile browsers usually measure slower than a wired mouse on a desktop.

The fair comparison is always you against yourself on the same device. If you want to compare with a friend, use the same computer.

Mouse, keyboard or touchscreen?

All three work. Press whatever you can trigger with the smallest movement:

Keyboard: rest a finger on SPACE. Many people find this the quickest because there is no hand movement at all, which makes it a good keyboard reaction time test.
Mouse: rest your finger lightly on the left button, already touching it.
Touchscreen: keep your finger hovering just above the panel.

Pick one method and stick with it, otherwise you are comparing different setups rather than your reactions.

Simple reaction time vs choice reaction time

This is a simple reaction time test: one signal, one response, the same kind of human reaction test used in research. It is the cleanest way to measure raw speed. In real life and in games you usually face a choice, such as which way to turn or which target to hit, and choosing takes extra time on top of your simple reaction.

To train speed with a decision attached, try the Aim Trainer, where you have to find and hit targets. For a racing style start where you wait for five red lights to go out, try the F1 Reaction Test.

Getting a faster score

You cannot rewire your nervous system in an afternoon, but a few things make your measured time better straight away:

Be rested. Tiredness slows reactions more than almost anything else.
Remove delay from your setup: a wired or performance mode mouse, a high refresh rate monitor and a mouse polling rate of 1000 Hz. Our polling rate guide explains why that last one matters.
Do one practice round before the round you care about.
Watch the centre of the panel and do not try to predict the change.

For what research says about training, sleep, caffeine and games, read our full guide on how to improve reaction time.

Reaction time and other speed tests

A reflex test like this one and a click speed test measure related but separate skills. Once you know your reaction time, compare it with:

the CPS test, which counts clicks per second,
the 10 second click test for clicking stamina,
the Spacebar Counter for keyboard speed,
the Typing Speed Test for words per minute.

Frequently asked questions

What is the average human reaction time?

For a simple visual signal like this test, a large study of adults found an average of 231 ms on standard computer equipment, or about 213 ms without hardware delay. Most people score between about 200 and 260 ms at home.

Is 200 ms a good reaction time?

Yes. An average of 200 ms over five tries is faster than most adults manage. Under 180 ms is exceptional.

Is this reaction time tester accurate?

It measures the time from the frame where the colour changes to the moment your input reaches the browser, using a high resolution timer. That is accurate for tracking your own progress. Your screen and input device add their own delay, so absolute numbers differ slightly between devices.

Why are my times so different between tries?

Attention is never perfectly steady. A short blink, a glance away or pressing slightly early all change a single try. That is why the test averages five tries, and why one slow try is nothing to worry about.

Do you react faster to sound than to light?

Generally yes. Studies comparing the two find auditory reaction times are faster than visual ones. This test uses a visual signal only, so do not compare it with sound based tests.

Does age affect reaction time?

A little. In the large study mentioned above, simple reaction time slowed by roughly half a millisecond per year of age, so a 60 year old would be only about 20 ms slower than a 20 year old on average.

Is my score saved?

Your best five try average is saved in your browser on this device. Nothing is uploaded, and clearing your browser data resets it.