Reaction Time Test

How fast are your reflexes? Click when the screen turns green and find out.

Click anywhere to start

When the screen turns green — click as fast as you can

Reaction time reference

Superhuman

< 150ms

Elite athlete / professional gamer territory. Exceptionally rare.

Lightning Fast

< 185ms

Top 5% of people globally. Your reflexes are genuinely exceptional.

Fast

< 215ms

Top 20%. Faster than average with good visual processing speed.

Average

< 250ms

Right in the human average range of 200–250ms. Perfectly normal.

Below Average

< 300ms

Slightly slower than average. Fatigue, age, or caffeine may be factors.

Slow

300ms+

Take a rest, grab some water, and try again when you're fresh.

Average human visual reaction time: 200–250ms. Browser-based tests are accurate to ±5ms on most devices.

💡 TIP

Reaction time is fastest at around 2pm–6pm when body temperature peaks.

Frequently Asked Questions

What is the average human reaction time?

The average human visual reaction time is approximately 200-250 milliseconds. Athletes and gamers typically score faster with regular practice.

How accurate is this test?

Browser-based reaction tests are accurate to within a few milliseconds for most devices. Touchscreen results may vary slightly from mouse results.

Can I improve my reaction time?

Yes. Reaction time improves with practice, good sleep, and regular physical activity. Fatigue and certain medications can slow it.

Is this a medical test?

No. This is a fun game for entertainment only.

Can I share my score?

Yes. Use the share button to copy your score and challenge friends.

Reaction Time: What Your Score Actually Means

Human visual reaction time — the gap between seeing a stimulus and physically responding to it — typically falls between 200 and 250 milliseconds in healthy adults. That gap is the sum of several physiological processes: light entering the eye, the retina converting photons to electrical signals, those signals travelling along the optic nerve, the brain processing the visual information, a motor command forming and travelling down the spinal cord, and finally the muscle contracting.

How fast is elite?

Professional athletes and experienced gamers typically test in the 150–190ms range. The improvement comes primarily from reduced processing time in the brain — the body learns to recognise specific stimuli and pre-load the motor response. Sprint athletes additionally use anticipatory reactions, beginning their response before fully processing the stimulus.

Below 150ms is effectively the floor of human voluntary reaction time. Anything faster involves involuntary reflex arcs that bypass the brain entirely — these are not measurable with a choice reaction test.

Factors that affect reaction time

Sleep deprivation is the most consistent reaction time impairment in healthy adults — comparable in magnitude to moderate alcohol intoxication. Being awake for 17 hours produces reaction time impairment similar to a blood alcohol level of 0.05%. Age also matters: reaction time peaks in the mid-20s and slows gradually thereafter. Regular physical exercise maintains faster reaction times across age groups. Caffeine provides modest improvement of 10–20ms for most people.

Browser-based accuracy

JavaScript timers in browsers are accurate to approximately 1ms under normal conditions. Monitor refresh rate introduces a ceiling on effective accuracy — at 60Hz, the maximum resolution is ~16ms. High refresh monitors (144Hz, 240Hz) reduce this to 7ms or 4ms respectively. These constraints mean browser-based reaction tests are accurate as relative measures but carry a systematic latency that varies by device.