Free online test
Reaction Time Test
How fast are your reflexes? The average person reacts in 200–250 ms. Test yours for free — no signup, no download, just your brain and a screen.
Start the reaction time test →What does the test measure?
The test measures simple visual reaction time — the gap between seeing a stimulus (a highlighted cell) and pressing a button. It captures two things: how fast your eye detects the signal, and how fast your brain sends the "press" command to your hand.
This is different from choice reaction time, where you must decide between multiple responses. Simple reaction time is the raw speed floor of your nervous system — a useful baseline for tracking cognitive fitness over time.
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Average reaction time by age
Reaction time naturally slows with age, but the effect is modest until your mid-50s. Regular cognitive exercise significantly narrows the gap.
| Age group | Typical range |
|---|---|
| Under 18 | 190–220 ms |
| 18–24 | 195–230 ms |
| 25–34 | 205–240 ms |
| 35–44 | 215–255 ms |
| 45–54 | 230–270 ms |
| 55–64 | 245–290 ms |
| 65+ | 270–330 ms |
Ranges based on published laboratory studies. Individual variation is high — lifestyle, sleep, and practice matter as much as age.
What is a good reaction time?
Under 150 ms
Professional gamers and combat athletes. Extremely rare without training.
150–200 ms
Top 10–15% of the population. Active gamers and trained athletes typically land here.
200–250 ms
The normal human range. Most healthy adults between 18–45 fall here.
250–300 ms
Fatigue, age, or low familiarity with digital interfaces can push into this range.
300 ms+
Possible indicators: sleep deprivation, medication effects, or first time playing.
What affects reaction time?
Age
Reaction time peaks in your late teens and slowly increases from your mid-20s. The change is subtle until your 50s — a trained 50-year-old often outperforms an untrained 20-year-old.
Sleep deprivation
Even one night of poor sleep slows reaction time by 10–30 ms. After 17–19 hours awake, your reaction time matches a blood-alcohol level of 0.05%.
Stimulus type
Auditory reaction (sound) averages 140–160 ms — about 20–40 ms faster than visual reaction (light). Touch is fastest of all. Most games and driving situations involve visual cues.
Anticipation vs. pure reaction
If you know roughly when a signal will appear, your brain pre-activates motor pathways and you can respond in under 150 ms. True pure reaction to an unpredictable signal averages 200–250 ms.
Practice
Consistent training compresses reaction time by strengthening the motor pathways involved. Gamers and athletes regularly score 30–50 ms below untrained individuals of the same age.
Caffeine
A moderate dose (100–200 mg) reduces reaction time by roughly 10–15 ms by blocking adenosine receptors. The effect peaks 30–60 min after consumption.
Can you improve your reaction time?
Yes — within limits. Your raw neural conduction speed is fixed by biology, but the bulk of your reaction time is taken up by decision and preparation time, which is highly trainable. Research shows consistent practice can trim 20–50 ms over weeks.
The fastest gains come from: (1) regular stimulus-response practice that builds automatic motor patterns, (2) improving sleep — the single highest-leverage intervention — and (3) cardiovascular fitness, which increases cerebral blood flow and speeds signal transmission.
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