Introduction
A percentile tells you how a value compares to the rest of a data set. If you score in the 90th percentile on a test, you did better than 90% of the people who took it. Percentiles are used in school, health, sports, and many other fields to rank and compare numbers quickly.
This percentile calculator lets you find the value at any percentile in your data set, or find the percentile rank of any value you choose. Just type in your numbers, pick a percentile, and press Calculate. The tool sorts your data, does the math, and shows you the answer with a full step-by-step solution. You can also look up multiple percentiles at once, view a distribution chart, and generate a complete percentile table.
Two calculation methods are supported. The Excel / Sheets method uses linear interpolation and is the most common approach. The Nearest Rank method always returns a value that exists in your data set. Both methods work with any size data set, including decimals and negative numbers.
How to Use Our Percentile Calculator
Enter your data set and choose what you want to find. This calculator will give you percentile values, percentile ranks, a step-by-step solution, and a chart of your data.
Enter Your Data Set: Type or paste your numbers into the text box. You can separate them with commas, spaces, or new lines. You need at least 2 numbers for the calculator to work.
Find Value at Percentile: Type a number from 0 to 100. The calculator will tell you what value in your data falls at that percentile. For example, entering 75 gives you the 75th percentile value.
Find Percentile of a Value: Type any number to find out what percentile it falls at in your data set. The number does not have to be in your data.
Find Multiple Percentiles: Type several percentiles separated by commas, like 10, 25, 50, 75, 90. The calculator will show all of those values at once in a grid.
Calculation Method: Pick how percentiles are calculated. The Excel/Sheets method uses interpolation and is the most common. The Nearest Rank method always picks a value that exists in your data.
Decimal Places: Choose how many decimal places to show in your results, from 0 to 8.
Full Percentile Table: Check this box to see a table of percentiles for your data. Use the Table Interval dropdown to pick the spacing, such as every 5th or every 10th percentile.
Click Calculate to see your results. Click Reset to load the sample data, or click Clear to erase everything and start over.
What Is a Percentile?
A percentile tells you how a single value compares to every other value in a group. If your test score is at the 75th percentile, it means you scored higher than 75% of all the people who took the test. The number does not tell you how many questions you got right. It tells you where you stand compared to everyone else.
How Percentiles Work
To find a percentile, you first put all the numbers in order from smallest to largest. Then you figure out which value sits at the spot that splits the data at the percentage you want. For example, the 50th percentile is the middle value, also called the median. The 25th percentile is the value where 25% of the data falls below it, and the 90th percentile is the value where 90% of the data falls below it.
Common Calculation Methods
There are two main ways to calculate a percentile:
- Excel / Sheets Method (Interpolation): This method finds the exact spot between two data points using a formula. It can return a value that does not appear in your original data. This is the most widely used method in spreadsheets and statistics software.
- Nearest Rank Method: This method always picks a value that actually exists in your dataset. It rounds up to the nearest whole position in the sorted list.
Key Percentiles to Know
Some percentiles have special names because they are used so often:
- Quartiles: The 25th percentile (Q1), 50th percentile (Q2 or median), and 75th percentile (Q3) split data into four equal parts. The difference between Q3 and Q1 is called the interquartile range (IQR), a key measure of spread.
- Deciles: The 10th, 20th, 30th percentiles and so on split data into ten equal parts.
Where Percentiles Are Used
Percentiles show up in many parts of everyday life. Doctors use them to track a child's height and weight compared to other kids the same age. Schools use them to report standardized test scores. Businesses use them to study salaries, website speed, and customer data. Any time you need to know where one value falls inside a large group of numbers, percentiles give you a clear answer.