Interquartile Range Calculator
🎲 Statistics & probability. Use the Interquartile range formula to find iqr, upper quartile q₃, lower quartile q₁: pick the value you want, type the others, and the answer updates as you go.
IQR12
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| IQR | no unit |
| Upper quartile Q₃ | no unit |
| Lower quartile Q₁ | no unit |
Worked example
Find the iqr when Upper quartile Q₃ = 30, Lower quartile Q₁ = 18.
Using IQR = Q3 - Q1: IQR = 12.
Frequently asked questions
What is the formula for Interquartile range?
IQR = Q3 - Q1.
What do the letters stand for, and what units are used?
IQR, Upper quartile Q₃, Lower quartile Q₁.
How do you calculate iqr?
Put the values into IQR = Q3 - Q1. For example, with Upper quartile Q₃ = 30, Lower quartile Q₁ = 18, iqr = 12.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (iqr, upper quartile q₃, lower quartile q₁) and fill in the others: it rearranges the formula for you.
