Reaction Time Test – Reaction Speed in Milliseconds

Q: Can I play it as a reaction time game?

Yes. Each run gives an average to beat, and More options has other rounds, such as Best of three and Twenty-try endurance. Scores stay in this browser, so nobody sees your times unless you copy the result and send it.

How it works

This reaction time test measures how quickly you respond when a red pad turns green. The wait is a random 2 to 5 seconds, so counting does not help. Five tries give your average in milliseconds, your fastest and slowest.

Read the full guide

How to test your reaction time

Tap the pad and it goes red. When it turns green, click it, tap it or press any key. A press before green is a false start: it is not timed, and the try starts over. Five tries make a run, and Go again starts a new one.

Rounds for reaction time practice

Standard five is the default. Ten-try average and Median of seven are steadier, which helps when you compare two mice or two monitors. Warm-up three saves nothing: use it to check your mouse and screen before a run that counts.

Rest your finger on the mouse button or key with the slack taken up. Travel before the switch fires is time on the clock.
Look at the lamps in the middle of the pad, not at the pointer.
Do not guess: World Athletics treats a start quicker than 0.1 seconds after the gun as a false start.

Questions and answers

What does this reaction test measure?

Simple reaction time: one signal, one response. That makes it a visual, human reaction time test of the quickest kind. Tests where you answer some signals and ignore others, or where each signal has its own response, give slower times.

Is this a response time test of me or of my screen?

Both are in the number. The clock runs from the page asking for green to the browser hearing your press, so it also holds up to one screen refresh (about 17 ms at 60 Hz) and the delay inside the mouse or keyboard.

Is my result on this reaction time tester good?

Lower is quicker. Human times on a simple test like this are usually around 200 ms, before a device adds its delay. This website will not rank you: it collects nobody's scores, and times from different screens and mice cannot be compared.

Can I play it as a reaction time game?

Yes. Each run gives an average to beat, and More options has other rounds, such as Best of three and Twenty-try endurance. Scores stay in this browser, so nobody sees your times unless you copy the result and send it.

Can a reflex test tell me anything about my health?

No. It is a skill test for practice and curiosity, and a slow run can come from a tired day, cold hands or a busy computer. It cannot diagnose anything. If you are worried about your reactions, talk to a doctor.

All 13 rounds

Scoring rounds 4

Best of three Three tries and only the fastest counts. Good for a quick check between games, but one lucky guess can flatter it, so set it beside your five-try average.
Median of seven Seven tries and the middle one counts, so a single blink or a single early guess cannot move the result.
Standard five Five tries with a random wait of 2 to 5 seconds before green. The result is the average of all five in milliseconds. Your personal best and the last-ten chart use this round.
Ten-try average Ten tries smooth out one slow or one lucky try. The average moves less from run to run, which makes this the round for comparing two mice or two screens.

Show all 13 rounds (9 more)

Wait-length rounds 4

Fixed two seconds The wait is always exactly 2 seconds. Once you learn the beat you can press almost on time, which shows how much of a quick time can be anticipation. Presses under 100 ms are marked as anticipated.
Long waits Green comes after 5 to 9 seconds. Holding your attention that long is the hard part of this round, and a wandering mind shows up at once in the number.
Short waits Green comes 1 to 2 seconds after the red lamps, so five tries take about a quarter of a minute. Set the result beside Long waits to see what the length of the wait does to your own times.
Wide spread The wait can be anything from 1 to 8 seconds, so you cannot settle into a rhythm. Studies of variable waits find slower reactions when green arrives sooner than expected.

Hand and input rounds 3

Keyboard five The same waits, answered with the space bar. A key switch and a mouse button add different delays, so this round has its own best.
Off-hand five The standard round taken with the hand you do not normally use. It keeps its own personal best, so it never mixes with your main times.
Touch five For phones and tablets: tap anywhere on the pad. Touchscreens add delay of their own, so touch times are stored apart from mouse times.

Warm-up and stamina 2

Twenty-try endurance Twenty tries in a row, which takes about a minute and a half. The result shows the average of the first five beside the average of the last five, so you can see whether your attention fades.
Warm-up three Three tries that are not saved. Use them to wake up your hand and to check that the mouse and screen are behaving before a run that counts.

How this list was compiled: Rounds designed for this page. Each one changes a single thing about the standard test (how many tries, how the score is worked out, how long the wait before green can be, or what you press), so that two results can be compared fairly. The notes on waits follow the research on warning signals and variable foreperiods summarised at https://en.wikipedia.org/wiki/Mental_chronometry, and the 100 ms anticipation limit follows the World Athletics false-start rule described at https://en.wikipedia.org/wiki/False_start (both checked 2026-09-18). The rounding of browser clocks is documented at https://developer.mozilla.org/en-US/docs/Web/API/Performance/now (checked 2026-09-18). No time or average on this page comes from another site. Licence: own work