Percentile Calculator
Estimate the percentile value of a numeric data set using linear interpolation
Values may be separated by commas, spaces or new lines.
Percentile value
How we calculated it
About the Percentile Calculator
A percentile describes the position of a value within an ordered data set. For example, a value at the 90th percentile is at or above a large share of the observations under the percentile convention being used.
Different statistical software can interpolate percentiles slightly differently, especially in small data sets, so the chosen method matters when exact replication is required.
How to Use the Percentile Calculator
- Enter the numerical data set.
- Choose the percentile you want, such as the 25th, 50th or 90th.
- Calculate the percentile value or percentile rank according to the selected mode.
- Use the same percentile convention when comparing results from different tools or reports.
How the Calculation Works
The data are sorted from smallest to largest. A percentile position is then calculated from the requested percentage and sample size using the calculator’s interpolation convention.
When the position falls between two observations, the method may interpolate between them rather than selecting one raw data point.
Worked example
Percentile Calculator Worked Example
50th percentile of 10, 20, 30, 40, 50
The 50th percentile is the median. In this ordered five-value set, the middle observation is 30, so the 50th percentile is 30.
Result guide
Understanding Your Percentile Calculator Result
A percentile is a relative position, not a percentage score. Being at the 90th percentile does not mean the measured value itself equals 90%.
Before you rely on the answer
Assumptions and Limitations
- Data are numerical and belong to one comparable distribution.
- The percentile definition or interpolation method is understood.
- Duplicate values are handled according to the calculator’s ranking convention.
Practical tip
Using This Result in Practice
When reproducing a published percentile, check the software or formula used. Small methodological differences can change percentile values in modest-size data sets.
Related calculations
Useful Calculations to Continue With
If you want to focus on the 25th and 75th percentiles and the middle half of the data, use the Interquartile Range Calculator.
If you need central-tendency measures rather than percentile position, use the Mean Median Mode Calculator.
Common questions
Percentile Calculator FAQ
Is the 50th percentile the median?
Under standard definitions, the 50th percentile corresponds to the median.
What does 90th percentile mean?
It indicates a position near the upper end of the distribution, with roughly 90% of observations at or below that level under the chosen method.
Why can two calculators give slightly different percentiles?
They may use different ranking and interpolation conventions, especially when the requested position lies between observations.