Interquartile Range (IQR) Calculator
Calculate Interquartile Range (IQR) online easily. Enter your dataset to find IQR, Q1, and Q3. Understand data spread with this free IQR calculator.
IQR Calculation Zone
Enter your dataset as comma-separated numbers to calculate the Interquartile Range.
Minimum 4 numbers are required for IQR calculation.
Calculation Results
Visualizing IQR
A simple visualization to represent the spread of data and the Interquartile Range.
Understanding Interquartile Range (IQR)
The Interquartile Range (IQR) is a measure of statistical dispersion, representing the spread of the middle 50% of your dataset. It is calculated as the difference between the third quartile (Q3) and the first quartile (Q1).
Why is IQR Important?
- Robust to Outliers: Unlike the range, IQR is not affected by extreme values, making it a robust measure of spread.
- Central Tendency: IQR, along with the median (Q2), provides a good sense of the central tendency and variability of a dataset, especially for skewed distributions.
- Data Comparison: Useful for comparing the spread of different datasets. A smaller IQR indicates less variability in the middle 50% of the data.
How to Use This Calculator:
Simply enter your dataset as comma-separated numbers in the input field above and click 'Calculate IQR'. The results, including Q1, Q3, and IQR, will be displayed instantly. Use the visualization to understand the data spread graphically.
Learn more about IQR on resources like Wikipedia.