What Percentile Rank Means
A percentile rank tells you what percentage of values in a data set fall at or below a specific value. For example, scoring at the 80th percentile means your score is equal to or higher than 80% of everyone else's scores in that data set.
Percentile = ((Number Below + 0.5 × Number Equal) ÷ Total Count) × 100
Why the "0.5 × Number Equal" Term?
When multiple values in the data set exactly match your target value, this calculator counts them as "half below, half above" — a standard statistical convention that gives a fairer percentile estimate than assuming all tied values rank either fully above or fully below.
Common Uses
- Understanding where your exam score, salary, or height ranks compared to a reference population
- Comparing your performance against classmates' or colleagues' results
- Analyzing distributions in research or data science contexts