Reaction time test
Wait for the screen to change, then click or tap as fast as you can. There are five rounds with different waits, and at the end you see your average in milliseconds and how you compare with the typical person.
Wait for the screen to change, then click or tap as fast as you can. If you go too early, the round repeats with a penalty.
Tips
- Keep your eyes on the panel and do not guess the timing: react only when the signal appears.
- You can use your mouse, tap the screen, or press the space bar or Enter.
- There are 5 rounds, and the wait changes each time so you cannot anticipate it.
- Going too early adds 500 ms to that round. It is better to wait.
Best score: —
Tap the screen, click, or press the space bar. There are 5 rounds, and you move on to the next one as soon as your reaction is measured.
Paused
Your game will pick up right where you left off.
Result
—
- Best score
- —
How to use it
- Select Play and wait without clicking: the screen stays calm, and you have to hold still until it changes.
- When “Now!” appears with the filled circle, click, tap the screen, or press the space bar as fast as you can.
- If you go too early, the round repeats with a 500 millisecond penalty.
- Finish all 5 rounds, then check your average, your best round, your worst round, and the comparison with the human average.
Frequently asked questions
What is a good reaction time?
The human average is around 250 milliseconds in a simple test like this one. Under 200 ms is an excellent reflex, and above 400 ms usually points to tiredness or distraction.
Why am I penalized if I go early?
Because guessing the timing is not measuring a reflex. If you click before the change, the round repeats and 500 ms are added, so it pays to wait patiently and react only when the signal appears.
Do my mouse or my screen affect the result?
Yes. A mouse with high latency, a slow display, or tapping with a finger instead of using a mouse can add a few milliseconds. To compare your own scores, always use the same device and the same posture.
How does the tool measure time?
It uses the browser’s high-precision clock (performance.now) and reads it the instant you click. The internal timer and the penalty keep the result stable even if the browser is busy.
Can I take the test again?
Yes, as many times as you like. Each test is five rounds, and when it ends your best score is saved in your browser so you can compare between games. Nothing is sent to a server.
How the reaction time test works
The test measures how long you take to react to a change on the screen. First there is a wait of 1.5 to 5 seconds; when the screen changes, the timer starts and it stops the instant you click. With five rounds, an average is calculated, which is more reliable than a single measurement.
What affects your reaction time
- Your device: touch screens and wireless peripherals add latency.
- Tiredness and time of day: reflexes get worse late in the day or on little sleep.
- Attention: looking at the exact spot where the signal appears shortens your reaction.
- Anticipation: guessing the moment does not help; going early is penalized.
How to improve your score
Rest your hand, relax your finger, and keep your eyes fixed on the panel. Avoid blinking just as you wait for the change, and do not start moving before you see the signal. Rest between games: fatigue shows up quickly over just a few rounds.
The human average and the penalties
The 250 millisecond reference comes from a simple visual task like this one. Going early adds 500 ms and repeats the round, because the goal is to measure how long you take to react, not how often you guess right.
Privacy
All the calculations happen in your browser. No times or data are sent to any server, and your best score is saved only on your device.
Updated on October 2, 2026