Mathematical illustration
A percentile needs
a real comparison group.
We don’t have a verified population dataset for this test. The calculator below uses an assumed normal distribution: a mean of 250 ms and standard deviation of 50 ms. It shows what the model predicts, not your ranking among people.
What the number means
The model takes a score and calculates the share of its assumed distribution above that score, because lower reaction times are faster. Change the assumptions and the percentile changes. The inputs are illustrative, not validated cohort statistics.
A browser reaction measurement includes display, input and browser delays. Keep your own device and method consistent if you want to compare attempts.
Keep a useful score log →A personal baseline is a better start.
Try a free week of reaction practice and record comparable attempts.