Reaction Time Test
Wait for the screen to turn green, then click as fast as you can.
Click to Start
or press Space
Keyboard shortcut: Space
What is a Good Reaction Time?
Most people land between 200 and 300ms. That's perfectly normal — your brain needs time to process what your eyes see, decide to act, and send a signal to your hand. The whole chain takes a fraction of a second, but that fraction adds up.
Here's a rough breakdown of what the numbers mean:
Under 150ms
Elite
Pro gamers, professional athletes
150–200ms
Excellent
Regular gamers, physically active people
200–250ms
Good
Above average, better than most
250–300ms
Average
Typical for healthy adults
300–400ms
Below average
Common when tired or distracted
400ms+
Keep practicing
Try a few more attempts after resting
Keep in mind that monitor refresh rate, mouse click delay, and internet latency don't affect this test — it runs entirely in your browser with performance.now() for sub-millisecond timing.
How to Improve Your Reaction Time
Reflexes aren't purely genetic. With the right habits, most people can knock 30–50ms off their baseline within a few weeks.
Sleep properly
Reaction time gets measurably worse after one night of poor sleep. Even a 20-minute nap can restore it. This is probably the single biggest lever you have.
Exercise regularly
Aerobic exercise improves neurotransmitter function and blood flow to the brain. Studies show regular exercisers consistently outperform sedentary people on reaction tests by 10–20ms.
Practice deliberately
Repetition builds neural pathways. Gaming, racket sports, and martial arts all sharpen reflexes because you're constantly responding to unpredictable stimuli under time pressure.
Stay hydrated
Even mild dehydration (2% of body weight) slows cognitive processing. Water before a test is a free performance boost.
Avoid anticipating
It's tempting to guess when the green will appear and pre-click. That produces artificially fast (and invalid) times. The test randomizes the delay between 1 and 5 seconds precisely to prevent this.
Frequently Asked Questions
What is the average human reaction time?
For a visual stimulus (like this test), the average is around 250ms. Auditory reactions are quicker at roughly 170ms — your ears process signals faster than your eyes. Age, fatigue, and caffeine all shift the number.
Why does my reaction time vary between attempts?
Totally normal. Your alertness, how tightly you're gripping the mouse, and even what you were thinking about all affect the result. That's why the average over 5 attempts gives you a better picture than any single number.
Can you improve your reaction time?
Yes — within limits. You can't train below the physical speed of neural transmission, but most people operate well above that floor. Consistent practice, good sleep, and exercise can realistically improve your results by 20–50ms.
Is this test accurate?
It uses performance.now() which has sub-millisecond resolution. The main source of variability is display lag (usually 8–16ms on a 60Hz monitor). For a casual benchmark it's accurate enough — just compare your own attempts rather than treating the absolute number as clinical truth.