Scoring in the 80th percentile does not mean you got 80% of something right. It means your result was better than 80% of the people in a specific comparison group. That distinction — percentile versus percentage — trips up more people than almost any other statistic in a test report.
Percentile versus percentage
A percentage tells you how much of a task you completed correctly: 85% means 85 out of 100. A percentile tells you where you rank against other people's results: the 85th percentile means you scored better than 85% of the comparison group, whatever your raw number happened to be. You could be in the 85th percentile with a very different raw score depending on how hard the test was and who else took it.
A simple way to see it: if you're the fourth-tallest person in a group of 20, then 16 people are shorter than you — you're at the 80th percentile for height in that specific group. Change the group to a different room, and the same height could land you at a completely different percentile.
Why the comparison group is the whole story
A percentile is only as meaningful as the group it's calculated against. The same raw score can be an unremarkable result against one reference sample and a standout result against another. That's why a credible percentile always needs a named source: who was measured, how many people, and under what conditions.
This is also why percentiles from different tests, or the same test on different sites, usually shouldn't be compared directly — unless you know they're drawing on the same reference data measured the same way.
How percentiles work on this site
The reaction time test and the digit span test report your result as a percentile calculated against a published study with a real sample of adults, so the comparison group is a named, checkable source rather than a guess. The Schulte table deliberately shows a result summary instead of a percentile, because no reliable public distribution exists for it: no source, no percentile. You can browse every test in the test library, and your own result history is saved locally in your browser so you can track your own change over repeated attempts — which, day to day, tells you more than a single percentile does.
What a percentile doesn't tell you
A percentile ranks you against a group; it doesn't diagnose anything, and no percentile on this site is a medical or health measurement. A single result, high or low, reflects one attempt under one set of conditions — comparing your own results across several attempts is more informative than any single number.
Does 95th percentile mean top 5%?
Yes — scoring at the 95th percentile means you did better than 95% of the comparison group, which puts you in the top 5%.
Is the 75th percentile the same as scoring 75%?
No. The 75th percentile means you outperformed 75% of the comparison group; your actual percentage score, if the test even has one, could be higher or lower than that.
Is the 50th percentile the same as 50%?
No. The 50th percentile is the median — half the group scored higher, half scored lower — and it has no fixed relationship to any percentage score.