Percentile Calculator
Find the kth percentile of any dataset using linear interpolation.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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Enter your dataset in the text box and specify which percentile you want to find (0 to 100). The calculator uses linear interpolation to find the value at that percentile rank. For example, the 90th percentile means 90% of the data falls below that value.
The breakdown shows the minimum, maximum, median, and count. Adjust the percentile value to explore different thresholds in your data.
About Percentiles
A percentile indicates the percentage of data that falls below a given value. The 50th percentile is the median. The 25th and 75th percentiles are Q1 and Q3. Percentiles are used in standardized testing (SAT scores, growth charts), salary benchmarking, and performance analysis. This calculator uses the linear interpolation method, which provides smooth estimates between data points.
Frequently Asked Questions
What is the 50th percentile?
The 50th percentile is the median, the value where half the data falls below and half falls above. It splits the dataset into two equal halves.
How is percentile rank different from percentile?
Percentile answers "what value is at the kth percent?" Percentile rank answers "what percent of data falls below this value?" They are inverse operations.
Why do different methods give slightly different percentile results?
There are multiple methods for computing percentiles (nearest rank, linear interpolation, etc.). Each handles the fact that percentile boundaries may fall between data points differently. Linear interpolation, used here, provides the smoothest estimates.