Reaction Speed Test Online - Measure Your Reaction Time

Attempts

—————

Average reaction time

—

100 ms500 ms

Median: —
Best: —
Spread: —
False starts: 0

How to take the reaction test

Press the dark panel — or hit the space bar — to start.
The panel turns red. Wait, and do not press anything.
The moment it turns green, press as fast as you can.
Repeat five times. The page then shows your average, median, best and spread.

A press before the green counts as a false start: the attempt is repeated rather than thrown into the average, so five valid measurements are always collected. Anything under 100 ms is treated the same way — a simple visual reaction cannot be that fast, so such a press is anticipation rather than a response.

What you measure here is not pure nerve conduction. The number includes the time your screen needs to show the green frame, the delay of your mouse, keyboard or touchscreen, and the browser's own timing granularity. The same person can be 20-40 ms apart on a 60 Hz laptop and a 144 Hz gaming monitor. Compare yourself with yourself on the same equipment, and treat the bands below as orientation rather than as a verdict.

What your result means

The bands below are reference points for a simple visual reaction — one stimulus, one response. They are not a medical or diagnostic scale.

Average	What it usually means
under 200 ms	Exceptionally fast — the range of trained esports players. Rare on a first run, and rarer still on a laptop screen.
200-249 ms	Faster than typical. Common among people who play fast-paced games regularly, and on good hardware.
250-299 ms	The typical range for a healthy, rested adult reacting to a visual signal.
300-399 ms	Slower than typical. Most often fatigue, divided attention, an unfamiliar input device or a slow display — not the nervous system.
400 ms and above	Noticeably slower. Worth repeating in a quiet moment on a device you use every day before reading anything into it.

What changes your reaction time

Sleep and fatigue

The single largest everyday factor. A short night moves a simple visual reaction by tens of milliseconds and makes results far less consistent — which is why the spread between your best and worst attempt is often more telling than the average itself.

Age

Simple reaction time is fastest in the late teens and twenties, then drifts upward slowly and steadily. The change across a decade is smaller than the change between a rested and a tired evening.

Type of signal

Reactions to sound are usually faster than reactions to light, because an auditory signal needs fewer processing steps to reach the motor cortex. A test built on a colour change, like this one, therefore reads slightly slower than a beep-based one.

Your equipment

Display refresh rate, wireless versus wired input, and touchscreen versus mouse each add their own delay. This is the most common reason the same person scores differently on two devices.

Attention and expectation

A varying delay before the signal — 1.2 to 4.5 seconds here — stops you from timing the green instead of reacting to it. When the wait feels long, attention drifts and the attempt gets slower.

Practice

Results improve over the first handful of runs simply from familiarity with the task, then plateau. Real gains come from regular practice, not from repeating the test ten times in one sitting.

FAQ

What is a good reaction time?

For a simple visual reaction, 250-300 ms is the typical range for a rested adult. Under 250 ms is faster than typical, and under 200 ms is the range of trained esports players. Below 100 ms is not a reaction at all — no one can see a signal and respond that fast, so it means the press was timed to the wait rather than to the green.

Why is my result worse on a phone than on a computer?

Touchscreens register a press later than a mouse button, and phone displays often refresh less often than a gaming monitor. Both delays land inside your measured time. The gap is real but it is your hardware, not your reflexes — compare phone runs with phone runs.

Why is the first attempt usually the slowest?

The first attempt carries the cost of settling into the task: you are still learning where to look and how hard to press. This is why the test takes five measurements and reports a median alongside the average — the median ignores a single outlier, the average does not.

What counts as a false start, and why does the attempt not count?

Any press made while the panel is still red. Recording it would reward guessing the delay instead of reacting to the signal, so the attempt is simply repeated. False starts are counted separately and shown with your result, because a run with several of them says something on its own.

Can I improve my reaction time?

Partly. Sleep, alertness and a familiar input device account for most of the everyday variation, and fixing those brings the quickest change. Regular practice on fast-paced tasks helps beyond that, but simple reaction time has a floor set by how long a signal needs to travel from eye to hand — around 150 ms for most people.

Is reaction to sound faster than reaction to light?

Yes, usually by roughly 30-50 ms. An auditory signal reaches the motor areas of the brain through a shorter chain than a visual one. That is why athletics starts use a gun rather than a light, and why this colour-based test reads a little slower than a sound-based one.