A reaction time test you can trust round after round
This reaction time test measures how quickly you respond to a visual signal. The panel turns red while you wait, then green at a random moment between two and five seconds later; click, tap or press Space the instant it changes. Five rounds are averaged so that one lucky or unlucky click does not define your result, and your best single round, your average and any false starts are all shown.
Results are given in milliseconds and placed in a clearly labelled reference band, from “Exceptional” to “Very slow”. A small chart keeps your last twenty tests so you can see whether coffee, sleep, a new mouse or practice makes a measurable difference.
The test runs entirely in your browser; your history is stored on this device only and can be cleared with one click.
How to use the Reaction Time Test
- Click the panel (or press Space) to begin. It turns red: wait, and do not click yet.
- When the panel turns green, click or tap as fast as you can. Your time for that round appears immediately.
- Click again to start the next round. If you click while the panel is still red it counts as a false start and that round is repeated.
- After five rounds you get your average, best round and reference band, and the test is added to your history chart.
- Press Restart test at any time to begin again. Use Clear history to wipe your stored results.
Reaction Time Test features
Five-round average
Single clicks vary by 50 ms or more; averaging five rounds gives a number that is stable enough to compare day to day.
False-start detection
Clicking before the green signal is caught and counted rather than recorded as an impossible 0 ms — it is a sign you were guessing the timing instead of reacting.
Random delay
The wait before green varies between two and five seconds on every round so you cannot anticipate it.
Mouse, touch and keyboard
The test responds to the pointer-down event, which fires sooner than a full click, and to the Space bar or Enter key for keyboard users.
Reference bands
A plainly labelled, illustrative table places your average from “Exceptional” below 150 ms to “Very slow” above 400 ms, with the matching row highlighted.
History chart
A canvas chart of your last twenty tests shows the average as bars and your best round as a dashed line, so trends are easy to spot.
What is a good reaction time?
For a simple visual stimulus — one signal, one response — most healthy adults record somewhere between 200 and 300 ms on a computer, with a mean usually quoted in the mid-200s. Younger adults tend to be a little faster, and times lengthen gradually from the thirties onwards. Values under 150 ms on this kind of test are rare and usually reflect either anticipation or a very fast display-and-input chain; values above 400 ms are commonly caused by tiredness, distraction or a laggy device rather than slow reflexes.
The bands shown on this page summarise those commonly reported ranges so you have a frame of reference. They are not drawn from a specific study and are not a medical measure: if you are worried about your reflexes, speak to a professional.
Why your device affects the number
Your result is the time from the pixel changing colour to the browser receiving your input, so it includes hardware delays you cannot react your way around:
- Display: a 60 Hz screen refreshes every 16.7 ms, so the green frame can appear up to one frame after the browser asks for it. Monitors also add a few milliseconds of processing. A 120 or 144 Hz screen shaves off roughly 8 ms on average.
- Input: a wired gaming mouse reports every 1 ms; a typical wireless mouse or trackpad every 8–16 ms. Touch screens are slower still, often adding 20–60 ms.
- Browser and OS: event delivery usually costs a few milliseconds and can spike when other tabs or apps are busy.
Getting a faster, more consistent score
- Keep your finger resting on the button or key and respond with a small movement, not a tap from height.
- Fix your eyes on the centre of the panel and focus on the colour change rather than the text.
- Do not try to predict the green; false starts cost you a repeated round and encourage guessing.
- Test at the same time of day under the same conditions if you want to compare results. Sleep, caffeine, alcohol and fatigue all move the number by tens of milliseconds.
- For the raw clicking speed that matters in some games, try the CPS test; for sustained accuracy, the typing speed test is a better measure.
Reaction Time Test FAQ
Is 250 ms a good reaction time?
It is a normal result for an adult on a computer — close to the typical median for a simple visual click test. Anything under about 230 ms counts as fast on this page.
Why does the test say “Too soon”?
You clicked while the panel was still red. That is a false start: the round is cancelled and repeated, and the false-start counter goes up. Wait for the green signal.
Why is my reaction time slower on my phone?
Touch screens add their own processing delay, often 20–60 ms, and mobile browsers deliver events a little later than desktop ones. Compare phone results only with other phone results.
How many rounds does the reaction time test use?
Five. The average of those five is your main score; the fastest single round is shown separately. Repeat the test a few times for a reliable picture.
Where does the reference table come from?
It is an illustrative summary of commonly reported ranges for visual click tests on consumer devices, written for this page. It is not a clinical dataset and should not be used to assess health or fitness to drive.
Is my history uploaded anywhere?
No. The last 20 results are saved in your browser’s local storage on this device, and Clear history removes them. Nothing is sent to a server.