Percentile Calculator

Find the value at the kth percentile in a dataset (linear interpolation).

Inputs

Result

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How to use this calculator

  • Enter your data.
  • Choose a percentile (0-100).
  • Read the percentile value.

About this calculator

A percentile tells you where a value sits in a distribution — the 75th percentile is the value below which 75% of the data falls. There are several percentile algorithms; this calculator uses NIST linear interpolation, the same method R's default and most stats textbooks use.

Frequently asked

How does this differ from quartiles?+
Quartiles are special percentiles: Q1 = 25th, Q2 = 50th (median), Q3 = 75th. The math is the same.
What does "percentile rank" mean for an SAT score?+
A percentile rank of 90 means you scored higher than 90% of test-takers. The actual cutoff value depends on the test.
Why are there multiple percentile methods?+
Different ways to handle non-integer ranks. Methods differ for small datasets but converge for large ones. NIST linear is the most common.
Can the percentile be a value not in the data?+
Yes — interpolation between two adjacent sorted values usually produces something not in the dataset.
How is percentile different from percentage?+
Percentage is a part-of-whole ratio. Percentile is a position within a distribution.

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