Reaction Time Guide — The Benchmark Average and Why Times Differ

Whether your record is fast or slow, what determines reaction time, and why the number changes when you switch devices.

One-line summary. The public average for visual reaction time is about 273ms (Human Benchmark user statistics). Under 200ms is on the fast side, and 350ms or more is enough to suspect fatigue or device delay. If you have not measured yet, check your 5-round average first in the Reaction Time Test.

What is reaction time?

It is the time it takes to perceive a stimulus and for your body to react. It includes the process of your eyes detecting a color change, your brain judging "now," and a command being delivered to your finger muscles.

Reaction time varies by the type of stimulus. Reactions to sound tend to be faster than to visual stimuli, and choice reactions — where you have to pick one of several options — are slower than simple reactions. This site's test measures the most basic simple reaction time: tapping in response to a screen color change.

What is the average reaction time in ms?

About 273ms is the widely used benchmark. It is the average from Human Benchmark's reaction time test statistics, which collect data from users worldwide.

5-Round Average	Assessment
Under 200ms	Very Fast — Top tier
200–249ms	Fast — Faster than average
250–299ms	Average — Range that includes the public average of 273ms
300–349ms	Normal — May reflect condition or device effects
350ms or more	Slow — When fatigued or device delay is high

Visual reaction time is fastest in the late teens to twenties, and tends to slow gradually afterward. However, baseline values differ greatly from person to person, and the same person can vary by tens of milliseconds in a day depending on condition. Looking at an average over multiple attempts is more accurate than a single best record.

What factors affect reaction time?

The biggest factors are sleep and fatigue. The rest are as follows.

Lack of sleep / fatigue — When you are short on sleep, both judgment and reaction slow down. This is the most common cause of slower reaction time.
Age — Peaks in your twenties and gradually slows afterward.
Caffeine — A temporary alerting effect can make reactions somewhat faster. However, if late intake ruins your sleep, you will be slower the next day.
Alcohol — Even a small amount slows reactions. Both judgment speed and accuracy drop together.
Focus and predictability — In situations where the timing of a stimulus is obvious, your body prepares in advance and your record improves; with a random wait, it cannot.
Health condition — Even a mild dip in condition, like a cold, can slow reactions slightly.

So if your record suddenly gets worse, it is right to suspect the previous night's sleep and your condition before your ability.

Why do measurements differ by device and browser?

Because the measurement combines not only a person's reaction time but also the delay with which the device processes input. With a 60Hz monitor refresh rate, just changing the screen can take up to about 16.7ms, and smartphone touch adds delay while reading input. Mice and keyboards also differ in input delay by product, and the time a browser takes to process a press varies slightly as well.

Because of this, it is common for the same person to record 320ms on a smartphone and 260ms on a PC. Differences created by the device are usually on the order of tens of milliseconds, so comparing records from different devices directly inflates the apparent difference. As a rule, compare records on the same device and in the same environment.

Not an absolute assessment. Web reaction time measurements, including this test, cannot separate out device delay. Do not use them as a basis for judging driving aptitude or health status; use them only for fun and for checking changes in your own condition.

Can you make your reaction time faster?

The limit of your basic reaction speed is set by nerve conduction speed, but the records you feel day to day change quite a bit with lifestyle habits.

Sleep enough — The most reliable method. The tens of milliseconds lost to lack of sleep are hard to recover with any trick.
Exercise regularly — Steady aerobic exercise helps maintain cognitive processing speed.
Task practice — Repeating the same test improves your record for that test. It is the effect of becoming familiar with the stimulus pattern.
Caffeine in moderation — A small amount can help when you need alertness, but it only matters within a range that does not harm your sleep.

Conversely, after drinking or pulling an all-nighter, no amount of practice will produce your usual record. On days when your measurement is poor, it is better to take it as a fatigue signal from your body.

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Frequently Asked Questions

Q. Is reaction time innate, or can it be improved with training?
Both play a role. Basics like nerve conduction speed are largely innate, but repeating a specific task produces a practice effect that can shorten your time for that task by tens of milliseconds. However, improvement in one task does not transfer directly to other situations.

Q. Does reaction time slow down with age?
It tends to. Visual reaction time is fastest in the late teens to twenties, and gradually slows afterward. However, individual differences are large, and people who exercise regularly and sleep enough often maintain faster reactions than the average for their age group.

Q. Does caffeine make reaction time faster?
A temporary alerting effect can make reactions somewhat faster. But if excessive intake disrupts your sleep, your reaction time can slow down considerably the next day. Sufficient sleep has a far greater effect on reaction time than caffeine.

Q. Is it unusual if my measurement is faster than 100ms?
A simple human reaction to a visual stimulus is generally considered physiologically difficult to bring below about 150ms. A result under 100ms is likely a tap that anticipated the timing of the change, so it is better to judge by a 5-round average than a single record.

Q. Does playing games improve reaction time?
Studies have found that people who play action games process visual stimuli quickly. However, that improvement is centered on situations similar to games, and opinions are divided on whether it extends broadly to everyday reaction time. Separately from gaming skill, repeating the same test clearly makes you more familiar with the test itself.