Free OnlineCalculators & Converters
Percentile Calculator
Calculate percentiles and quartiles for any dataset. Find the value at a given percentile, or find what percentile rank a specific value falls at.
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Key Features — Percentile Calculator
Find value at any percentile (P10 through P99)
Find percentile rank of any value
Q1, Q2 (median), Q3, and IQR
P10 and P90
Linear interpolation (Excel/R compatible)
Paste any size dataset
Why Use This Tool — Percentile Calculator
Free Online Percentile calculatorCalculate percentile — for EveryoneFast & Easy Quartile calculatorPercentile rank calculator — 100% FreeFree Online Find percentilePercentile from dataset — for Everyone
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Frequently Asked Questions — Percentile Calculator
What is a percentile?
A percentile indicates the value below which a given percentage of observations fall. The 75th percentile (Q3) means 75% of values are at or below that number. A student scoring at the 90th percentile scored higher than 90% of all test takers.
What is the interquartile range (IQR)?
IQR = Q3 − Q1, the range of the middle 50% of data. It measures statistical spread without being affected by outliers. A data point is often considered an outlier if it falls more than 1.5×IQR below Q1 or above Q3 (the "fence" method used in box plots).
How is percentile calculated?
This calculator uses linear interpolation (Type 7), the default method in R, Excel's PERCENTILE function, and Python's numpy. For a dataset of n values sorted in order, the value at percentile p is found at position (p/100)×(n−1), with linear interpolation between adjacent values if needed.