# Percentile Calculator

URL: https://speedycalculator.com/calculators/statistics/percentile/
Last updated: 2026-10-25

> The percentile calculator finds the value below which a chosen percentage of the data fall, such as the 90th percentile, and the percentile rank of a given value.

## Inputs

- Data
- Percentile

## Results

- Value at percentile

## Formula

```
P-th percentile = value at rank (n − 1) × P/100 (interpolated)
```

## Explanation

Percentiles are used for test scores, growth charts, response times and income distributions.

### How to use the Percentile Calculator

- **Data**
- **Percentile**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

The data are sorted and the requested position is interpolated between neighbouring values.

### Inputs explained

FieldWhat to enterDataA list of numbers separated by commas, spaces or new linesPercentileA number

## Worked example

Inputs — Data: 55, 60, 62, 70, 71, 75, 80, 85, 88, 95; Percentile: 90.

Results — **Value at percentile = 88.7**.

## FAQ

**Is the 50th percentile the median?**
Yes.

**What does “90th percentile” mean?**
90% of values are at or below it.

**What formula does the Percentile Calculator use?**
P-th percentile = value at rank (n − 1) × P/100 (interpolated).


## Sources

- [NIST/SEMATECH e-Handbook of Statistical Methods](https://www.itl.nist.gov/div898/handbook/)