Math & Statistics Calculator

Percentile Calculator

Find any percentile from a data set, compare nearest-rank and linear interpolation methods, and calculate the percentile rank of a specific value.

Calculate percentile from data

Separate values with commas, spaces or new lines.

Percentile formulas

Nearest rank uses rank = ceil(p / 100 x n). Inclusive linear interpolation uses a fractional position between the first and last data points.

Always sort the data before finding a percentile. The calculator does this automatically.

Common percentiles

  • 25th percentile: first quartile, or Q1.
  • 50th percentile: median.
  • 75th percentile: third quartile, or Q3.
  • 90th or 95th percentile: often used for performance and risk thresholds.

Percentile Calculator FAQ

What is a percentile?

A percentile describes the value below which a given percentage of data falls.

What is the 50th percentile?

The 50th percentile is the median, the middle point of an ordered data set.

Why do methods give slightly different answers?

Percentile methods differ in how they treat ranks between two data points. Spreadsheets and statistics packages may use different defaults.

What is percentile rank?

Percentile rank estimates what percentage of the data is below a specific value, with ties counted halfway.