Is My Reaction Time Good? How to Read Your Test Results
Last updated 8 minutes to read
If you searched for a good reaction time in milliseconds, the most useful answer depends on the test that produced the number. A score from one visual browser test is not automatically comparable with a score from a different task, device, or response method.
This guide explains the result shown by Quartenson's Reaction Time Test, what its summary numbers mean, and how to compare repeat sessions without treating one quick response as a verdict about you.
Quick answer: what is a good reaction time?
There is no single millisecond cutoff that makes every reaction time score good or bad. The task, number of measured trials, browser, display, and input method all matter. For a useful personal comparison, repeat the same test with the same trial count and setup.
In a Quartenson sample of 174 five-trial completion sessions, the median of the session medians was 274 ms. The middle half of those session medians fell between 248 and 307 ms. This is a self-selected site sample, not a universal reaction-time norm or a rating of an individual.
Eligible five-trial sessions
174
Quartenson Reaction Time Test, tool version 1
Median of session medians
274 ms
Each session's median came from 5 measured responses.
Middle half of session medians
248 to 307 ms
The 25th to 75th percentile in this site sample.
These are completion sessions, not a count of unique people. Repeat sessions may come from the same visitor. This article summary does not break results down by device, browser, or input method, so it cannot show how scores differ across those setups.
What does this reaction time test measure?
Quartenson's test shows a visual signal after a changing wait. You respond to that signal with a pointer or keyboard input. It is a simple visual reaction task: one signal appears and the task is to respond, rather than identify one signal among several choices.
You can choose from one to ten measured trials. A false start is recorded when an input happens before the signal appears. The result summarizes the valid responses from that session and reports the selected trial count so you can keep comparisons like-for-like.
Open the Reaction Time TestHow to read each number in your result
The metrics answer different questions. Start with the median, then use the other fields to understand what happened during those trials.
Median response time
The median is the middle response time after the valid trials are ordered from fastest to slowest. In a five-trial session it is the third value; with an even number of valid trials, it is the average of the two middle values. It gives a better picture of a typical response in that short session than the single fastest result.
Fastest response
This is the quickest valid response in the session. It can be interesting, but it is one trial and may be unusually quick. Do not use it alone as your baseline or as proof that your usual response has changed.
Average response time
The average uses all valid trials. A very fast or slow response can move it more than it moves the median, so read it alongside the median instead of treating either one as the whole story.
Response spread
Quartenson calculates spread as the slowest valid response minus the fastest valid response in that session. It is a range, not a standard deviation. A smaller range means the five recorded times were closer together in that session; it does not establish a stable trait or prove that one session was better overall.
False starts
A false start means an input happened before the visual signal appeared. Read the count beside the valid response times: it describes an early response in this session, not evidence of an attention problem.
What the Quartenson five-trial sample shows
The 174 eligible sessions had a median within-session spread of 78.5 ms. In 99 sessions (56.9%), there were no false starts. These summaries describe separate parts of the results: they do not show whether faster sessions had fewer false starts or less spread.
| Measure | Session median | What it means |
|---|---|---|
| 25th percentile (P25) | 248 ms | One quarter of session medians were at or below this point. |
| Median (50th percentile) | 274 ms | Half of session medians were at or below this point. |
| 75th percentile (P75) | 307 ms | Three quarters of session medians were at or below this point. |
Five-trial session median percentiles
Middle half of session medians
248 ms – 307 ms
The 25th to 75th percentile in this Quartenson sample.
The band marks only P25, the median, and P75. It is a percentile summary, not a histogram of raw results, and it does not show how many sessions fall at each point.
Want to see your own result?
Run five measured trials to match this example, then read your median, spread, and false starts together. If another trial count is selected, choose five in the test settings before you start. The test is free and runs in your browser.
Start the reaction time testA practical way to compare your sessions
Use the result to compare the same task with your own earlier sessions. Keep the comparison simple and repeatable:
- Choose one trial count. Use five measured trials if you want to compare your result with the Quartenson sample in this guide.
- Use the same device, browser, and response method each time. Avoid comparing a touch response on one session with a mouse or keyboard response on another.
- Complete the trials without trying to guess when the signal will appear. Review false starts along with the valid response times.
- Compare the median first, then check the fastest time, spread, and false starts for context. Keep the result as a session snapshot rather than a label.
- Repeat on another occasion under similar conditions before deciding that a pattern has changed. If you switch devices or input methods, treat that as a new setup.
For a broader method for tracking results across different browser tools, read the cognitive training progress benchmark guide.
Why scores can change between devices and tests
A browser result depends on more than the time between noticing a signal and making a response. The display has to show the signal and the device has to register your input; browser and hardware timing are part of the measurement too. Research testing browser-based timing across touchscreen and keyboard devices found that accuracy and response-time estimates varied with the setup. Those findings explain why raw scores from different setups should be compared cautiously; they do not provide a correction factor for Quartenson.
The task itself also matters. A test with one visual signal is different from a choice task where you must identify a stimulus and select among responses. Different tasks and scoring rules can produce different millisecond values, even when both pages call the result reaction time.
What a browser reaction score cannot tell you
A short reaction-time test is a score from one specific task. It does not measure intelligence, diagnose a condition, assess eyesight, or establish whether someone is safe to drive. It also cannot show from one session whether practice has changed performance outside this test.
Use the result for a narrow purpose: learn how this session went, and compare repeat sessions when the task and setup match. If you are concerned about a health or vision issue, a recreational browser score is not a substitute for professional advice.
Reaction time test questions
Clear answers about reaction time scores, trial counts, and browser results.
What is a good reaction time in milliseconds?
There is no universal cutoff that applies to every reaction-time test. The task, number of trials, browser, display, and input method affect what a score represents. Compare results from the same test and setup. The Quartenson five-trial sample in this guide is site-specific context, not a general norm.
Is 274 ms a good reaction time?
The number alone cannot label an individual result as good or bad. In Quartenson's five-trial site sample, 274 ms was the median of session medians across 174 eligible sessions. That gives context for this tool only, and the sessions may include repeat visitors.
Should I use my fastest or median reaction time?
Use the median as the first summary of a short session. The fastest result is only one valid trial and may not reflect your typical response in that session. Check the average, response spread, and false starts as additional context.
How many trials should I complete?
Quartenson lets you choose from one to ten measured trials. Keep the trial count the same when comparing sessions. Use five if you want to compare with the sample figures in this article.
Why does my score change on another device?
Displays, browsers, hardware, and input methods can affect how a browser task presents a signal and registers a response. The Quartenson benchmark does not separate results by device or input method, so use the same setup for your own comparisons.
Does a reaction-time test predict driving or gaming performance?
No. This is a short visual browser task, not a driving-safety assessment or a prediction of performance in another activity.
