# IQR Calculator

> Find the interquartile range, quartiles Q1, Q2, Q3, and identify outliers using the 1.5×IQR rule.

**URL:** https://www.calculatoranswers.com/iqr-calculator
**Category:** Education

## Quick Answer

Calculate the interquartile range (IQR), quartiles Q1, Q2, Q3, and detect data outliers from any list of numbers.

## Definition

An IQR (Interquartile Range) calculator is a descriptive statistics tool that measures data dispersion by calculating the range of the middle 50% of a dataset. It sorts the dataset, computes Q1 (25th percentile) and Q3 (75th percentile) using linear interpolation, determines the IQR (Q3 − Q1), and flags any values falling outside the 1.5 × IQR fence as outliers.

## How to Use

1. **Enter dataset** — Type or paste your numbers separated by commas, spaces, or new lines.
2. **Run calculation** — The calculator sorts your data and identifies Q1, median (Q2), Q3, and the IQR.
3. **Analyze outliers** — Review the lower and upper fences to identify flagged outliers in your dataset.

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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