What is a good reaction time for a human?

The average adult clocks in around 250 ms. Under 200 ms is considered fast; under 180 ms puts you in the top tier alongside many competitive FPS gamers. Elite athletes in sports like cricket or table tennis can dip below 160 ms.

Does reaction time get worse with age?

Yes, measurably. Reaction time peaks in your early 20s and slows by roughly 1 ms per year thereafter. By age 60 the average is closer to 300–350 ms. Regular exercise and cognitively demanding activities can slow this decline.

Why does my score vary so much between attempts?

Biological variability in alertness, muscle tension, and even breathing cycle affects each click by ±20–30 ms. For a stable estimate, take the median of at least 5 attempts and discard any obvious outliers where you clicked early.

Can You Beat This Reaction Time Test?

The reaction time test is one of the most-searched human benchmarks on the internet — and for good reason. The average human reaction time to a visual stimulus is approximately 250 milliseconds, but competitive gamers, athletes, and fighter pilots can push closer to 150–180 ms with training. This game measures your simple visual reaction time with millisecond precision: wait for the screen to turn green, then click as fast as you can. No tricks, no prediction — just pure reflex.

How to Play

Press Start to begin a round. The screen turns grey with a "Wait for green..." prompt.
After a random delay of 1.2 to 3.7 seconds, the screen flashes green. Click immediately.
Clicking before the screen turns green counts as a false start and scores zero — patience matters.
Your reaction time in milliseconds is displayed alongside a 0–100 score (150 ms = 100, 600 ms = 0).
Play five rounds and average your best attempts to get a reliable baseline.

Why It's Hard

Reaction time is limited by neural conduction speed: your eyes detect the colour change, visual cortex fires (~50 ms), the signal travels to motor cortex, then down your spinal cord to your finger muscles (~100 ms more). The irreducible floor for a healthy adult is about 120–150 ms. Fatigue, caffeine, time-of-day, and screen latency all introduce variance — which is why a single trial is a noisy measure and why you should average multiple attempts.

Tips

1Rest your finger lightly on the mouse button or touchscreen — even 20 ms of button travel time adds up.
2Play when alert, not tired: circadian rhythms mean you'll likely be fastest in the mid-morning or early afternoon.
3Don't try to anticipate the green — the random delay is specifically designed to prevent timing predictions.

FAQ

What is a good reaction time for a human?: The average adult clocks in around 250 ms. Under 200 ms is considered fast; under 180 ms puts you in the top tier alongside many competitive FPS gamers. Elite athletes in sports like cricket or table tennis can dip below 160 ms.
Does reaction time get worse with age?: Yes, measurably. Reaction time peaks in your early 20s and slows by roughly 1 ms per year thereafter. By age 60 the average is closer to 300–350 ms. Regular exercise and cognitively demanding activities can slow this decline.
Why does my score vary so much between attempts?: Biological variability in alertness, muscle tension, and even breathing cycle affects each click by ±20–30 ms. For a stable estimate, take the median of at least 5 attempts and discard any obvious outliers where you clicked early.

Built by

Ethan R. Caldwell

Game Developer · Wilmington, DE

Designed Can You Beat This Reaction Time Test? and 46 other browser puzzles. Game developer based in Wilmington, Delaware. Hardcore puzzle gamer at heart — obsessed with logic puzzles, sokoban-style mechanics, and physics-based brain teasers. Off the clock, unwinds with ARPGs, RPGs and JRPGs.

[email protected]