Percentile rank is a statistical measure that indicates the relative standing of a value within a dataset. It shows the percentage of scores in a distribution that fall below a particular score. For example, if a student scores in the 75th percentile on a test, it means they performed better than 75% of the other test-takers. To calculate the percentile rank, you can use the formula: (number of values below the score / total number of values) × 100. This concept is commonly used in education, psychology, and various fields to compare individual performance against a larger group, such as students or employees.