Calculate percentile rank, percentile values, and quartiles for any data set. Enter numbers and instantly get Q1, Q2 (median), Q3, and any custom percentile. Free, no signup.
A percentile is a measure used in statistics indicating the value below which a given percentage of observations in a group of observations falls. For example, the 20th percentile is the value below which 20% of the observations may be found. This calculator uses the linear interpolation method (same as Excel's PERCENTILE.INC) for accurate results.
The 50th percentile is also known as the median. It is the middle value of a data set when sorted in ascending order.
IQR stands for Interquartile Range. It is the difference between Q3 (75th percentile) and Q1 (25th percentile). IQR is a robust measure of statistical dispersion.
This calculator uses the linear interpolation method (Excel PERCENTILE.INC / NIST method), which is the most commonly used approach in statistics and education.