Definition of

Percentile Rank

Percentile Rank
The percent of cases that are at or below a score.

But only count half of the cases that are at the score.

Example: in a recent test 12% got D, 50% got C, 30% got B and 8% got A

You got a B, so add up:
• all the 12% that got D,
• all the 50% that got C,
• half of the 30% that got B,
for a total percentile rank of 12%+50%+15% = 77%

In other words you did "as well or better than 77% of the class"

(Why take only half of B? Because you shouldn't imagine you got the "Best B", or the "Worst B", just an average B)

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