Reaction Time Test
Wait for the panel to turn green, then click as fast as you can. Get your reaction time in milliseconds, with your average, best, consistency and an approximate percentile over a round of attempts.
Finish two or more rounds to see your trend.
Clicks, taps, and Space presses before the green frame, and times under 100 ms, count as too soon and are retried. The wait is random, from 1.5 to 5seconds. Your all-time best and recent round averages are saved only in this browser. Every score includes your screen's delay and the mouse or keyboard delay.
What the numbers mean
What counts as fast or slow?
Rough labels for the curve on this page, not a count of other people: under 200 ms is fast, about 200 to 240 ms is above the middle, and about 240 to 300 ms sits around the middle. The curve is centered at 270 ms. The timer starts on the frame where green actually painted and stops when your button, finger or key goes down, using the browser's high-resolution clock. Judge yourself on the round average, not one lucky best.
What affects it
Sleep, practice, and the hardware can all change the number. Display lag and input lag are part of every score, so the same person can look slower on another screen or mouse.
How to cut the hardware part
- Use a high refresh rate screen. 60 Hz can hide up to 17 ms per frame, 144 Hz about 7 ms.
- Use a wired mouse, or a good 2.4 GHz gaming dongle. Bluetooth adds noticeable delay.
- On a TV, turn on Game Mode. Picture processing can add 50 ms or more.
- Close heavy background apps so the browser can draw every frame on time.
Not sure your monitor runs at the rate on the box? Check with the refresh rate test and the input lag test.
Simple vs. choice reaction time
This is a simple reaction test: one signal, one response. Choice reaction time, where you must pick the right response from several, is a different task and is slower, because you have to decide as well as react. Games mix both, which is why aim and tracking feel slower than this test suggests.
Related tools
Race the start lights in the F1 reaction test, react to a sound with the auditory reaction time test, measure your setup with the input lag test and the refresh rate test, or put your reflexes to work in the aim trainer.
Frequently asked questions
What does this reaction time test measure?
Simple visual reaction time: the milliseconds from the frame that paints the green panel to your click, tap, or Space press. It is one signal and one response, not a choice between targets. A round shows the average, best, worst, and standard deviation of the attempts that counted.
What counts as a false start?
Clicking, tapping, or pressing Space while the panel says Wait does not record a time. You retry that attempt. A result under 100 ms is also thrown out, because this test treats it as a guess. The wait before green is random, from 1.5 to 5 seconds, so it is not a gap you can memorize.
Can I use a key instead of clicking?
Yes. Click or tap the colored panel, or press Space. Space is ignored in a text field or dropdown so it does not start an attempt while you are changing settings. Holding Space does not stack attempts: a repeat from one hold is ignored. Enter also works when the panel or the page background is focused. A second press on the result screen only starts the next wait.
Are my results saved?
The fastest single attempt, and the average of each of your last 10 finished rounds, are saved in this browser only. They are not uploaded. Clear saved removes those two. The attempts-per-round choice is kept on its own in this browser.
When does the timer start and stop?
It starts after the green panel is committed, on the frame that paints it, and it stops at the click, tap, or key event. Input that arrives before that frame is a false start, not a score. A negative time is not recorded. The average is shown only after at least one counted attempt.
What do the bands and the percentage mean?
Rough labels, not a count of other visitors: under 200 ms is fast, under 240 ms is above the middle, under 300 ms is around the middle, and under 350 ms is a bit slow. The percentage places your round average on a normal curve centered at 270 ms with a spread of 50 ms.
How many attempts are in a round?
You pick 3, 5, or 10. The default is 5. False starts are left out of the average. A round is finished only when every attempt in that set has a counted time.