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Reaction Time Test.

Measure your visual reaction time in milliseconds over 5 trials. Clicks before the green signal are rejected, so your score is real.

On-device calculationNo signup
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Results update as you type.

Click or press Space to begin

Trial 1 / 5 · The space bar works too.

FAQs

What is a normal reaction time?

For a simple visual click test, most adults score between 200 and 300 milliseconds, with roughly 250 ms being typical. Under 200 ms is fast, and consistent scores under 180 ms are exceptional. A large part of that number is not your brain - it is display latency, input latency and the time your finger takes to travel.

Why does clicking early say "Too soon"?

Anticipating the green signal instead of reacting to it would produce impossibly low scores like 5 ms, which measure guessing rather than reaction. Any click registered before the go signal is rejected and that trial restarts, so every recorded score is a genuine reaction.

Why is the delay before green random?

The wait is randomised between 2 and 5 seconds precisely so you cannot learn the rhythm and time your click in advance. A fixed delay would let you pre-empt the signal after a couple of rounds.

Does my hardware affect the result?

Yes, considerably. A 60 Hz monitor adds up to about 17 ms of display latency versus a few milliseconds on a 144 Hz+ screen, and wireless mice, browser overhead and background load all add more. Compare your scores to yourself on the same setup rather than to other people on different hardware.

Can I take the test with the keyboard?

Yes. Tab to the test area and use the space bar (or Enter) to start each trial and to react. Keyboard and mouse latency differ slightly, so pick one input method and stick with it when comparing runs.

Cite this calculator

Canonical URL: https://mathify.one/fr/random/reaction-test

Cite as: Mathify. (2026). Test de Temps de Réaction. https://mathify.one/fr/random/reaction-test

Use Cases

Self-Assessment of Reflexes

Measure your reaction speed to gauge your alertness and cognitive processing speed.

Example: Test yourself after waking up or before a workout to see how your reflexes vary.

Tracking Improvement Over Time

Use the test periodically to monitor changes in your reaction time, whether from practice, lifestyle changes, or age.

Example: Test weekly and note your average to see if your reflexes are getting faster.

Frequently Asked Questions

How does the reaction time test work?
The test shows a red screen. Wait for it to turn green, then click as fast as you can. After 5 trials, you'll see your best, average, and median reaction time in milliseconds.
What is a good reaction time?
Average human reaction time is around 250-300 ms. Below 200 ms is considered fast, while above 300 ms may indicate slower reflexes. Use the test to see where you stand.
Can I improve my reaction time?
Yes, practice and physical fitness can help. Regular testing can track improvements. However, the test is for reference only and not a medical diagnostic tool.

Tips & Common Mistakes

Tips

  • Ensure you are in a distraction-free environment to get accurate results.
  • Use the same device and mouse/touchscreen for consistent comparisons.
  • Click immediately when the screen turns green, not before, to avoid false starts.
  • Take the test multiple times and use the average or median for a reliable measure.

Common Mistakes to Avoid

  • Clicking before the screen turns green, which can skew your reaction time.
  • Not focusing on the screen, leading to delayed clicks and inaccurate results.
  • Comparing your results to others without considering factors like age or fatigue.

Last updated: August 13, 2026