Reaction Time Test
Click when the box turns green and measure your reaction time in milliseconds. Best-of-5 scoring with rating scale. Free, 100% client-side.
Round 1 of 5 · mouse, tap, or spacebar · clicking during red restarts the round
Reaction Time Rating Scale
| Range | Rating | Context |
|---|---|---|
| < 200 ms | Excellent | Esports pros & F1 drivers (150–200 ms) |
| 200 – 250 ms | Good | Faster than ~75% of adults |
| 250 – 300 ms | Average | Median human is ~273 ms |
| > 300 ms | Below Average | Typical when tired or distracted |
Percentiles are approximate for healthy adults using a mouse; touchscreen results typically run 20–50 ms slower.
Quick Answer
A reaction time test measures how quickly you respond to a visual cue. The average human reaction time to a visual stimulus is roughly 273 milliseconds, though most healthy adults land between 200 and 300 ms. This free tool flashes a red box that turns green after a random delay — click (or press spacebar) the instant it changes to record your response in milliseconds across five rounds. Everything runs locally in your browser; nothing is uploaded.
How It Works
Click the test box or press spacebar to start a round
Wait for the red box to turn green — do not click early or the round retries
Click (or press spacebar) the instant it turns green to record your time in milliseconds
Complete five rounds to see your last, average, and best times with a rating
Key Facts
- Average human visual reaction time is about 273 ms; most adults fall between 200–300 ms
- Best-of-5 scoring: we track your last, average, and best response in milliseconds
- Under 200 ms is excellent — territory occupied by trained esports players and F1 drivers (150–200 ms)
- Random 1.5–5 second wait prevents you from anticipating the cue and cheating the test
- Clicking too early during the red phase warns you and retries the round — no false scores
- Works with mouse, tap, or spacebar for a fair, consistent measurement
- 100% client-side: your results never leave your browser
Frequently Asked Questions
What is a good reaction time?
For visual stimuli, under 250 ms is good and under 200 ms is excellent — most people average around 273 ms. Trained athletes, fighter pilots, and Formula 1 drivers typically react in 150–200 ms. Anything consistently above 350 ms suggests fatigue, distraction, or simply needing more warm-up rounds.
What is the average human reaction time?
Large studies put the median simple visual reaction time near 273 milliseconds, with most healthy adults between 200 and 300 ms. Reaction time to sound is faster (around 170 ms) because audio signals reach the brain quicker than visual ones. Age matters too: reaction times are fastest in your late teens and twenties and gradually slow afterwards.
What factors affect reaction time?
Sleep is the biggest one — a single night of poor sleep can add 10–30% to your response times. Age, caffeine, hydration, distraction, and whether you use a mouse versus touchscreen all play a role. Practice helps within a session: most people improve 10–20 ms after a few warm-up rounds, then plateau.
How fast are F1 drivers' reaction times?
Formula 1 drivers react to the starting lights in roughly 150–200 milliseconds, and elite esports players are in the same band. That is near the physiological floor for perceiving a visual cue and initiating a movement — which is why sub-200 ms results on this test are considered excellent.
Is my data saved or uploaded anywhere?
No. The entire test runs locally in your browser using JavaScript timing — no server requests, no accounts, no tracking. Your scores exist only on your device and disappear when you refresh the page.
Why did it tell me I clicked too early?
Clicking (or pressing spacebar) during the red waiting phase means you anticipated the green flash instead of reacting to it, which would produce a fake-fast score. The round restarts with a new random delay — wait for green, then respond.