How to use the reaction time test
- Click the blue box (or press Space) to start.
- The box turns red. Wait, and keep your finger ready.
- After a random delay it turns green. Click or press Space immediately.
- Your time appears in milliseconds. Repeat for 5 rounds.
- At the end you see your average, your best round and how you compare.
Clicking before the box turns green counts as a false start, and that round is repeated.
What is a good reaction time?
Reaction time to a simple visual signal is usually somewhere around 200 to 300 milliseconds for most adults. Online tests often show slightly higher numbers than lab tests, because your mouse, keyboard, screen and browser all add a little delay.
| Average time | What it means |
|---|---|
| Under 180 ms | Exceptional. Typical of well-trained gamers and athletes on fast hardware. |
| 180 – 220 ms | Very fast. |
| 220 – 270 ms | Above average to average. |
| 270 – 320 ms | Average for an online test. |
| Over 320 ms | Slower than usual. Tiredness, distraction or a slow screen may be the cause. |
These ranges are approximate and meant as a friendly guide, not a scientific score.
What affects your score
- Hardware: A high refresh rate monitor (120 Hz or more) and a wired mouse can save several milliseconds.
- Sleep and fatigue: Being tired is one of the biggest reasons for slow results.
- Focus: Notifications, music or talking while testing make you slower.
- Warm-up: Most people get faster after a few rounds.
- Age: Reaction time tends to be fastest in young adulthood and slowly increases with age.
- Caffeine: A moderate amount can make some people slightly faster for a short time.
How to improve your reaction time
- Test at the same time of day so your results are comparable.
- Get enough sleep. It helps more than any trick.
- Sit comfortably with your finger resting lightly on the mouse button.
- Look at the centre of the box and stay relaxed, not tense.
- Practise regularly with short sessions. Fast games and sports also help.
- Use a wired mouse and turn on your monitor’s highest refresh rate.
What this test measures
This is a simple reaction time test: there is one signal and one response. Your eyes see the colour change, your brain processes it and sends a signal to your hand, and your finger presses the button. The total time for that chain is your reaction time.
The delay before the green signal is random, so you cannot predict it. That is why guessing early usually leads to a false start.
This test is made for practice and fun. It is not a medical or diagnostic test.
Frequently asked questions
What is the average human reaction time?
For a simple visual signal, most adults score around 200 to 300 ms. In online tests, an average in the high 200s is very common because of extra delay from screens and mice.
Why are my results different on my phone?
Touch screens, phone displays and browser settings add different amounts of delay. Compare your results on the same device for a fair picture.
Is under 200 ms good?
Yes. An average under 200 ms in an online test is very fast and usually needs good focus and fast hardware.
Can I use the keyboard instead of the mouse?
Yes. Press Space to start and to react. Your keyboard may be slightly faster or slower than your mouse.
Is my data saved?
Your recent results are saved only in your own browser so you can track progress. Nothing is sent to us.