What Is a Good Reaction Time? Score Chart by Milliseconds
See what 150, 200, 250, 300 and 400 ms reaction times mean, how browser latency affects results, and how to interpret your reaction time score.
Published 2026-09-12 · Updated 2026-10-01
Quick answer: what is a good reaction time?
In MetricRally's browser test, 201–250 ms is Fast, 251–320 ms is Average, 200 ms or below is Very Fast, and 321 ms or above falls into the slower reference band. These are MetricRally's browser-test reference bands, not medical standards or population percentiles.
Test your reaction time →A browser reaction time score measures the delay between a visual stimulus appearing and your input being registered. The number includes human response time plus display, browser and input-device latency, so compare browser-test results with other browser tests rather than treating them as laboratory measurements.
Reaction Time Score Chart
| Reaction time | MetricRally band | How to read it |
|---|---|---|
| 150–200 ms | Very Fast | Very quick browser-test response; hardware latency can materially affect scores this low |
| 201–250 ms | Fast | Fast response within MetricRally's reference system |
| 251–320 ms | Average | Middle reference range for this browser-based test |
| 321–400 ms | Slow | Slower response; repeat the test under a stable setup before drawing conclusions |
| 400+ ms | Slow | Check attention, device/input delay and consistency across several runs |
What Does Your Millisecond Score Mean?
Is 150 ms reaction time good?
150 ms is an extremely fast browser-test result. At this level, monitor, mouse and system latency become a significant part of the measurement.
Is 200 ms reaction time good?
Yes within MetricRally's reference system: 200 ms sits at the upper boundary of the Very Fast band.
Is 250 ms reaction time good?
250 ms is in MetricRally's Fast band and is a strong browser-based reaction result.
Is 251 ms reaction time good?
251 ms is the first point in MetricRally's Average band. It is only 1 ms beyond the Fast cutoff, so that tiny difference is not meaningful by itself; compare your multi-attempt average across repeated runs instead.
Is 300 ms reaction time good?
300 ms sits inside MetricRally's Average reference band. Compare repeated runs rather than judging one attempt in isolation.
Is 400 ms reaction time slow?
400 ms is inside MetricRally's slower band. Before treating it as meaningful, repeat the test while rested and use the same device, browser and input method.
Why Browser Reaction Time Is Not Pure Human Reaction Time
Your measured score includes the time it takes the display to show the stimulus, the browser to process events and your mouse, trackpad or touchscreen to register the response. That makes browser tests useful for personal tracking and consistent comparisons, but unsuitable for diagnosing neurological performance or directly reproducing lab measurements.
What Affects Your Reaction Time Score?
- ▸ Display refresh and latency: A stimulus cannot be seen until the display presents the relevant frame.
- ▸ Input device: Mouse polling, wireless transport, trackpads and touchscreens can add different amounts of delay.
- ▸ Browser and system load: Background processes, extensions and rendering work can introduce timing jitter.
- ▸ Attention and fatigue: Human response varies from attempt to attempt, which is why several trials are more useful than one click.
How MetricRally Measures Reaction Time
MetricRally uses performance.now() for high-resolution timing. The test runs five attempts, rejects false starts and reports average, median, best and worst values. The average of the five valid attempts is the primary result.
How to Get More Consistent Results
- ▸ Use the same device, browser, monitor and input method when comparing sessions.
- ▸ Keep the test tab focused and close unusually heavy background work.
- ▸ Judge the five-attempt average and median instead of over-focusing on one best click.
- ▸ Repeat the test on different days if you want a more stable personal baseline.
Want to improve your consistency?
Read How to Improve Reaction Timefor practice and setup tips, or run the Reaction Time Testto establish your current baseline.
Note: MetricRally reaction time tests are for entertainment and self-tracking. They are not a medical, neurological or diagnostic tool.
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