Percentile Rank Calculator
Enter a dataset and a specific score to find what percentage of values fall at or below it — the percentile rank.
Percentage of dataset values at or below this score
- 1
Values strictly below score (L)
8 - 2
Values equal to score (E)
1 - 3
Total count (N)
15 - 4
Percentile rank = (L + 0.5 × E) ÷ N × 100
(8 + 0.5 × 1) ÷ 15 × 100 = 56.7
How does this calculator work?
Percentile rank = (L + 0.5 × E) / N × 100, where L is the count of dataset values strictly below your score, E is the count equal to it, and N is the total. Paste your dataset and enter the score — the calculator counts L and E, computes the rank, and marks the score on the distribution curve.
Formula
How this is calculated
A percentile rank tells you what percentage of a dataset falls at or below a given value. This calculator uses the midpoint interpolation formula: PR = (L + 0.5 × E) / N × 100, where L is the number of values strictly less than the score, E is the number of values exactly equal to the score, and N is the total count. Adding half of the equal-count (0.5 × E) places the score in the middle of its group, giving a more balanced result than a purely exclusive or purely inclusive formula.
For example, in a class of 20 students where 14 scored below 80 and 2 scored exactly 80, the percentile rank of 80 is (14 + 0.5 × 2) / 20 × 100 = 75%. This means 80 is at the 75th percentile — 75% of the class scored at or below that mark.
The distribution curve uses the dataset mean and standard deviation to show roughly where the score sits on a bell curve. This is only an approximation: your dataset does not need to be normally distributed for the percentile rank to be valid — the formula works on any numeric dataset regardless of its shape.
Frequently asked questions
A percentile rank tells you where a given score falls in a specific dataset (e.g. 75th percentile rank in your class). A percentile is a threshold value such that a given percentage of a reference distribution falls below it (e.g. the 75th percentile of national test scores is 620 points).
If the score does not appear in the dataset, E = 0 and the formula simplifies to PR = L / N × 100. Only the count of values strictly below the score matters in that case.
PR approaches 0% when the score is below every value in the dataset (L = 0, E = 0), and approaches 100% when the score is above every value. With the midpoint formula it reaches exactly 50% only when the score equals the median with no ties.
Also known as
TG we-Calculate Editorial Team. (2026). Percentile Rank Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/percentile-rank-calculator
TG we-Calculate Editorial Team. "Percentile Rank Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/percentile-rank-calculator.
TG we-Calculate Editorial Team, "Percentile Rank Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/percentile-rank-calculator
@misc{wecalculate_percentile_rank_calculator, title = {Percentile Rank Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/percentile-rank-calculator}}, year = {2026}, note = {TG we-Calculate} }
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