Free · No sign-up · Phone and computer
Reaction Time TestMeasure your reflexes in milliseconds
When the screen turns green, tap as fast as you can (on a computer, click or press Space). After 5 tries you get your median reaction time and a rating.
Reaction time (median)
0 ms
When you finish all tries, the score is collected anonymously. No name is sent.
How the reaction time test works
- Press “Tap to start”. The screen turns red.
- After a moment the screen turns green. Tap the instant it changes. Tapping before green is “too soon” and that try is repeated.
- After 5 tries you see your median reaction time (ms = 1/1000 of a second) and a rating.
The median is the middle value (the 3rd) when your 5 results are sorted from fastest to slowest. It is less affected by one unusually slow or lucky try, so it reflects your real speed better than the average.
Rating guide
The ratings are this site’s own guide for tests taken in a web browser. They are not a medical assessment or diagnosis.
| Reaction time (median) | Rating | Comment |
|---|---|---|
| < 200 ms | Very fast | A top-level reaction. |
| 200–249 ms | Fast | Clearly faster than typical. |
| 250–299 ms | Typical | A normal speed for a browser-based test. |
| 300–349 ms | A bit slow | Device lag or focus may play a part. Try again. |
| ≥ 350 ms | Slow | Keep your finger close to the screen and focus on the moment it turns green. |
Why your results change
- Device and browser: Screen refresh rate and touch or mouse input lag can shift results by tens of milliseconds for the same person.
- Focus and readiness: Keeping your finger close to the screen and being ready for the signal makes a difference.
- Condition and time of day: Lack of sleep and tiredness tend to slow your reactions.
- Age: Reaction time is generally said to lengthen gradually with age.
Tips for an accurate result
- Turn off notifications and raise screen brightness.
- Turn off battery saver on phones. On a computer, a wired mouse usually has less lag than a wireless one.
- Compare several tests rather than a single result.
- Use the same device and browser when comparing results.
Frequently asked questions
What is the average reaction time?
Simple visual reaction time, reacting quickly to a light or similar signal, is generally said to be around 0.2–0.25 seconds (200–250 ms). Browser tests add display and input lag, so measured values are usually a little longer. This page treats 250–300 ms as “typical”.
Why are my results different on a phone and a computer?
Screen refresh rate, touchscreen or mouse input lag and browser processing differ between devices. The same person can vary by tens of milliseconds. Use the same device and browser when comparing.
What happens if I tap too soon?
Tapping before the screen turns green is “too soon” and that try is not recorded. After a short pause the same try starts again. The wait before green is random each time (about 1.1–3.3 seconds), so you cannot predict it.
Can I improve my reaction time?
With practice you get used to the signal and learn to focus, and measured times often drop. Sleep, tiredness and time of day also affect results, so compare several tests rather than one.
Is my result sent anywhere?
When you finish all 5 tries, the score calculated from your median, the test duration, your device type (computer, phone or tablet) and the page language are sent. No name or email is collected, and IP addresses are not stored with scores. Unfinished tests are not sent. Your personal best is stored only in this browser.