Free online test
Reaction Time Test
Free, no sign-up. Wait for the pad to turn bright green, then click, tap or press Space. 5 attempts, with your average, best and worst in milliseconds.
About accuracy: your browser, screen and mouse or touch screen add some milliseconds between the real moment and what the page can measure (a 60 Hz screen only redraws every 16.7 ms, and input devices add delay of their own). Your result is not a clinical measurement. It is best used to compare your own results on the same device. Details and sources
Private by design. No cookies, no account, no server. Nothing is stored unless you finish a test: then your best result is saved in this browser only (localStorage) and you can clear it above. Privacy
How to take the reaction time test
- Click, tap or press Space on the pad to start an attempt.
- Wait. The pad says “Wait…”. If you click now it counts as too early and the attempt is repeated.
- When the pad turns bright lime green, click, tap or press Space as fast as you can.
- Your time in milliseconds (ms) is shown. Repeat until you have 5 attempts. Then you see the average, best and worst.
Want a different challenge? Switch above to the audio reaction test (react to a beep) or the click speed test (clicks per second).
What is reaction time?
Reaction time is the time between a signal and your response. In this test the signal is the colour change and the response is your click. Large online datasets give a typical result of a little over a quarter of a second: Human Benchmark reports a median of 273 ms and a mean of 284 ms from more than 81 million recorded clicks (its own test, which includes delays from screens and input devices). A calibrated laboratory study (Woods et al., 2015) measured average simple reaction times of 218 to 239 ms across adult age groups. See the sourced table.
Frequently asked questions
How does this reaction time test work?
Press the pad (click, tap or Space). It waits a random 1.5 to 5 seconds, then turns bright lime green. Click as fast as you can. The page shows the time in milliseconds. After 5 attempts you see your average, best and worst.
What happens if I click too early?
The pad turns orange and says “Too early!”. That attempt does not count and does not change your average. Click again to repeat the attempt.
Is my result saved?
Only after you finish a full test (5 attempts, or a click-speed round). Then your best result is stored in your browser on this device with localStorage. There are no cookies and nothing goes to a server. You can clear it under the pad at any time.
Why is my time different on my phone or another computer?
Screens redraw at a fixed rate (a 60 Hz screen every 16.7 ms), and mice, keyboards and touch screens each add their own delay. Human Benchmark notes that mobile taps tend to be a bit slower than clicks. Compare results only on the same device. See how accurate it is.
What is a good reaction time?
Human Benchmark reports a median of 273 ms from its own online test (81 million+ clicks, read October 10, 2026). A calibrated lab study found averages of about 218 to 239 ms across adult age groups. Details and sources: average reaction time.
Can I use the keyboard?
Yes. Press Space or Enter on the pad. On a phone or tablet, tap the pad.
Is this a medical test?
No. It is a simple online game and cannot diagnose anything. If you are worried about your reflexes or health, talk to a doctor.
Sources
- Human Benchmark: Reaction Time Statistics (median 273 ms, mean 284 ms, over 81 million recorded clicks; “30ms is currently a typical lag for a desktop/laptop”; mobile taps “tend to be a bit slower than clicks”). https://humanbenchmark.com/tests/reactiontime/statistics
- Woods DL, Wyma JM, Yund EW, Herron TJ, Reed B (2015). Factors influencing the latency of simple reaction time. Frontiers in Human Neuroscience 9:131 (Table 1, Table 2 and abstract). doi:10.3389/fnhum.2015.00131. https://pmc.ncbi.nlm.nih.gov/articles/PMC4374455/
- MDN Web Docs: Window.requestAnimationFrame() (callbacks run before the next repaint, usually at the display refresh rate, often 60 times per second). https://developer.mozilla.org/en-US/docs/Web/API/Window/requestAnimationFrame
Read and checked: October 10, 2026. Found a mistake? Email info@reactiontimetest.dev.