How the reaction time test works
Reaction time is the time between seeing something happen and responding to it. In this test the box turns red and waits for a random time between 1.5 and 4.5 seconds. The moment it turns green, the timer starts. When you click, tap or press the space bar, the timer stops and shows your reaction time in milliseconds (ms). One second is 1,000 milliseconds.
Because the waiting time is random, you cannot guess when to click. If you click before the box turns green, that try does not count and you simply try again. After 5 valid tries, the test shows your average, which is a much better measure than one lucky click.
What is a good reaction time?
| Average time | What it means |
|---|---|
| Under 200 ms | Excellent – esports and sprint-start level |
| 200 – 250 ms | Good – faster than most people |
| 250 – 300 ms | Average – typical for adults |
| 300 – 400 ms | A bit slow – try again when fresh |
| Over 400 ms | Slow – you might be tired or distracted |
Your result also depends on your device. Screens, mice and touchscreens each add a small delay (often 10–50 ms), so a phone score may be a little slower than a score on a computer with a gaming mouse. Compare your results on the same device.
What affects reaction time?
- Sleep: being tired is one of the biggest reasons for slow reactions.
- Age: reaction time is usually fastest in the late teens and twenties, and slows gradually after that.
- Focus: distractions such as music, notifications or talking slow you down.
- Practice: sports and video games can train you to react faster to what you see.
- Caffeine and exercise: both can give a small short-term boost.
Tips for a better score
- Keep your finger resting on the mouse button or screen, ready to click.
- Look at the centre of the box and stay relaxed – tension makes you slower.
- Don't try to predict the change; react to the colour.
- Use a computer with a wired mouse for the most accurate numbers.
Frequently asked questions
What is the average human reaction time?
For a simple visual test like this one, most adults score between 250 and 300 milliseconds.
Why is my phone score slower than my computer score?
Touchscreens and phone displays add a small delay before the tap is registered. That is normal, so compare phone results with phone results.
What happens if I click too early?
The try is not counted. The box turns orange and you can click to try again.
Can I improve my reaction time?
Yes. Good sleep, regular exercise, and practice with fast-paced games or sports can all help you react faster.