Percentile Calculator

Use this percentile calculator to find a specific percentile in your dataset and its quartiles. It also displays a table with the 10th, 25th, 50th, 75th, and 90th percentiles so you can gauge your data’s distribution at a glance.

Enter or paste a list of values and specify the desired percentile. The Percentile Calculator sorts your data set and computes precise percentile and quartile values. Click Calculate to see the result. Below this calculator is more information about percentiles and the method it uses to find the values. See all my Statistical Calculators!

For more in-depth information, read my article, Percentiles: Interpretations & Calculations.

How the Percentile Calculator Finds the Values

The percentile calculator starts by arranging all your values from smallest to largest. Then it locates the position that matches the percent you want. That position shows where your percentile falls in the list.

If it lands exactly on one of your values, the percentile calculator uses that value. If it falls between two values in your dataset, the percentile calculator interpolates a value between the two closest values. This method ensures a smooth, linear interpolation between adjacent data values.

In more technical terms, the percentile calculator uses the following process:

1. Arranges n data points in ascending order: x1, x2, …, xn.
2. Computes the index: idx = (p / 100) × (n – 1)
3. Let k be the integer part of idx, and let d = idx – k.
4. If d is 0, then the pth percentile is the value at position k+1.
5. If d is not 0, then the pth percentile is interpolated between the two surrounding values: Percentile = x[k+1] + d * (x[k+2] – x[k+1]).