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20th Percentile Calculator
Quick answer
If values are 12, 15, 15, 18, 22, 27, 31, the 20th percentile is 15.
20th percentile: Position = 20 ÷ 100 × (n − 1) in the sorted list; If the position falls between two values, interpolate between them.
Enter your values
- 12
- 15
- 15
- 18
- 22
- 27
- 31
7 values
20th percentile
15
The value below which this percentage of the data set falls — e.g. the 90th percentile is higher than 90% of the values.
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About the 20th Percentile Calculator
The 20th percentile is the value below which about 20% of the numbers in a data set fall. Enter your values and this calculator finds it by linear interpolation between the two closest ranks, the same method as Excel's PERCENTILE.INC.
For the starting values (12, 15, 15, 18, 22, 27, 31), the 20th percentile is 15.
20th percentile
Position = 20 ÷ 100 × (n − 1) in the sorted list
If the position falls between two values, interpolate between them
n is the number of values. The first value in the sorted list is at position 0.
Things to keep in mind
- You do not need to sort the values; the calculator does it.
- A percentile value is a number from your data's scale; a percentile rank tells you where a given value sits. They are different questions.
- Different software uses slightly different percentile methods, so small differences from other tools are normal.
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A quick guide to 20th Percentile
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How to Use the 20th Percentile Calculator
1
Enter Values
Provide your values.
2
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What is 20th Percentile?
This statistics & probability tool works out your 20th percentile instantly, so you don't have to do the math by hand.
“One quick calculation, so you always know your 20th percentile before you decide.”
What Affects Your 20th percentile
Your 20th percentile depends on the values below.
Values
Changing your values changes your 20th percentile.
Example Result
Here's what you can expect from a 20th percentile calculation:
- 20th percentile
- 15
Frequently Asked Questions
- What does the 20th percentile mean?
- It is the value that 20% of the data falls below. In the starting data, the 20th percentile is 15, so roughly 20% of the values are lower than that.
- How to calculate 20th percentile?
- Fill in values in the 20th Percentile Calculator above and your 20th percentile is calculated instantly. Change any value to see how the result responds.
- What does an example 20th percentile calculation look like?
- If values are 12, 15, 15, 18, 22, 27, 31, the 20th percentile is 15.
- Is this calculator free to use?
- Yes — every calculator on this site is completely free, with no sign-up or account required.
- How accurate is this calculator?
- It uses the standard formula and calculates on our server for every request, so results are precise for the values you enter.
- Is my data saved anywhere?
- No. Nothing you enter is stored or sent anywhere unless you choose to share a link with your values included.
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