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IQR Calculator

Statistics
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Calculates the Interquartile Range (IQR), which is the difference between the third quartile (Q3) and the first quartile (Q1). The IQR measures the spread of the middle 50% of a dataset.

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How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter First Quartile (Q1) and Third Quartile (Q3) in the units shown.

Step 2

Read Interquartile Range (IQR) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Example 1

First Quartile (Q1): 10; Third Quartile (Q3): 30

Interquartile Range (IQR): 20

Example 2

First Quartile (Q1): 5; Third Quartile (Q3): 15

Interquartile Range (IQR): 10

Example 3

First Quartile (Q1): 50; Third Quartile (Q3): 75

Interquartile Range (IQR): 25

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