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Reaction Time Test

Press the blue box to start. Wait while it's red, and press the moment it turns green. You get the average of 5 tries.

Press to startClick · tap · Space

Wait while it's red, and press the moment it turns green. Early presses don't count.

—

You get the average of 5 tries.

TryTime

Your history (this browser)

    Your screen, mouse or touch screen adds a little delay. Compare on the same device.

    Times are calculated on this page only. Nothing is sent.

    How to use

    1. 1. Press to startClick or tap the blue box, or press Space.
    2. 2. Press on greenWhen the box turns red, wait. The moment it turns green, press again. Pressing while it's red is “too early” and that try doesn't count.
    3. 3. Average of 5After 5 tries you see the average, fastest and slowest time. “Copy result” copies it as text.

    Tips for a fair comparison

    • Use the same device and screen
    • Use the same finger and posture each time
    • Your first tries are practice, so look at the average of a few sets
    • Compare when sleepy, tired or after coffee to see the difference

    What studies say about reaction time

    In large studies of simple reaction time (press when a colour appears), averages are in the 200s of milliseconds. A study of 1,469 people found an average of 231 ms, getting slightly slower with age (about 0.55 ms per year) and no difference by sex or education. In that study the screen and mouse alone added 17.8 ms on average.

    Sources: Woods et al. (2015) Factors influencing the latency of simple reaction time (Frontiers in Human Neuroscience)

    FAQ

    Who is this for?

    Gamers checking their reflexes, friends comparing who is faster, anyone curious how sleep or coffee changes their speed, and students measuring reaction time for a school experiment.

    How is it measured?

    The clock starts with the screen update that shows green, and stops at the moment you press. The wait before green is random each time (1.5–4.5 seconds), so you can't learn to press early.

    Does the time include screen and device delay?

    Yes. The time your screen takes to show the colour, the time your mouse, keyboard or touch screen takes to report the press, and the browser's own processing are all added a little. The same person can get different numbers on different computers, phones or screens, so compare on the same device.

    What is a normal reaction time?

    It depends on the study. A study of 1,469 people aged 18–65 found an average of 231 ms (213 ms after removing screen and mouse delay). Other large studies report averages of 261–285 ms. Equipment and method change the numbers, so this page's result can't be compared directly with study figures.

    Can it tell if I'm fit to drive?

    No. This page only measures the time from the colour change to your press. Don't use it to judge driving or health.

    What if I press too early?

    You'll see “Too early” and that try won't count. The number of early presses is shown in the result.

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