How the reaction time test works
In classic mode, click the box to start. It turns red, and after a random wait of 1.5 to 5 seconds it turns green: click, tap or press Space as fast as you can. You get five attempts, then your average, best, median and consistency. If you click while it is still red, that attempt is repeated, so guessing never helps your score.
F1 start lights mode copies a Formula 1 race start. Five red lights come on one per second, then after a random pause they all go out together. React the moment they do; going while any light is on counts as a jump start.
Timing starts when the changed frame is sent to your screen, not when the page's code runs, and uses the moment you press down (not release) as reported by the browser. Responses under 100 ms are treated as anticipation, the usual cut-off in reaction-time research, because nobody sees, decides and moves that fast.
What is a good reaction time?
| Average result | What it means |
|---|---|
| Under 150 ms | Exceptional and rare. Check you weren't anticipating. |
| 150–200 ms | Very fast. Common among trained competitive gamers on low-latency setups. |
| 200–250 ms | Fast. Quicker than most people. |
| 250–300 ms | Average for an online test on everyday hardware. |
| Over 300 ms | Slower than typical. Often device lag, fatigue or distraction. |
Large online datasets put the typical result at roughly 250 to 280 ms. Lab studies with specialised low-latency equipment measure lower, often around 200 ms for young adults, because a browser test also includes your mouse, computer and screen.
Typical reaction times by age
Simple reaction time is fastest in the late teens and twenties. A large study of adults aged 18 to 65 (Woods et al., 2015, Frontiers in Human Neuroscience) found it slows by roughly half a millisecond per year, and a large UK health survey (Der & Deary, 2006, Psychology and Aging) found the slowing speeds up from middle age. As a rough guide for a browser test on typical hardware:
| Age | Typical online result |
|---|---|
| Teens and 20s | 200–260 ms |
| 30s and 40s | 205–270 ms |
| 50s | 215–280 ms |
| 60 and over | 230–310 ms |
Gamers tend to score at the fast end for their age. Research on action video game players (Dye, Green & Bavelier, 2009) found they respond faster without losing accuracy. Practice and good equipment help too. F1 drivers typically react to the start lights in about 0.2 seconds.
What affects your reaction time
- Your screen. A 60 Hz display shows a new frame every 16.7 ms, and a TV outside game mode can add 50 ms or more of processing delay. Check yours with the refresh rate test.
- Your input device. Wired mice and keyboards usually respond faster than Bluetooth ones, and touchscreens add their own delay. The mouse test shows whether your clicks register cleanly.
- Alertness. Sleep loss, fatigue and alcohol slow you down noticeably. Caffeine gives a small boost.
- Warm-up and attention. The first attempts are usually the slowest. Keep your eyes on the centre of the box and your finger resting lightly on the button.
For a fair comparison with friends, use the same device, and take the average of several rounds rather than a single lucky attempt. Want to test your gamepad instead? Try the controller tester.
Frequently asked questions
What is a good reaction time?
On an online test like this, under 250 ms is fast, 250–300 ms is average and under 200 ms is very fast, the range where trained competitive gamers on low-latency setups tend to score. Results under 150 ms are rare and often mean the click was anticipated.
What is the average human reaction time?
For a simple visual test taken in a browser, most people average roughly 250 to 280 ms. Laboratory studies with specialised equipment measure lower, often around 200 ms for young adults, because an online test also includes the delay of your mouse, computer and screen.
How accurate is this reaction time test?
The timer starts on the animation frame when the green box is sent to your screen and stops at the browser's timestamp for your press, not the release. Your hardware still adds delay: a 60 Hz screen, a Bluetooth mouse or a TV outside game mode can add 10 to 50 ms or more, so compare results on the same device.
Why did it say my click was too fast?
Responses under 100 ms are treated as anticipation, the usual cut-off in reaction-time research, because nobody can see a change, decide and move that quickly. Clicking before the box turns green also counts as too soon. In both cases the attempt is simply repeated.
How does the F1 start lights test work?
Like a Formula 1 start, five red lights come on one per second. After a random pause they all go out at once, and your time runs from lights out to your click, tap or key press. Pressing while any light is still on is a jump start. F1 drivers typically react in about 0.2 seconds.
Does reaction time get slower with age?
Yes, gradually. Research such as Woods et al. (2015) found simple reaction time slows by roughly half a millisecond per year through adulthood, with a faster decline from middle age. Practice, alertness and good equipment matter more than age for most people under 60.
How can I improve my reaction time?
Warm up with a few rounds, sleep well, keep your eyes on the centre of the box and rest your finger lightly on the button. On the hardware side, a wired mouse, a high refresh rate monitor and game mode on a TV all cut delay you might otherwise blame on your reflexes.
Are my results saved or uploaded?
Your best single attempt, best 5-attempt average and best F1 start are saved only in this browser's local storage, and you can reset them at any time. Nothing is uploaded. A result link you share contains just your times.