---
title: "Interquartile Range Calculator | Free Statistics Calculator | XTRAW Tools"
description: "Calculate IQR and detect outliers using the 1.5×IQR rule. Use this free browser-based statistics calculator from XTRAW Tools to summarize and compare data."
url: "https://xtraw.com/tools/calculators/math-calculators/interquartile-range-calculator"
date: "2026-05-22T00:33:17+00:00"
language: "en-GB"
---

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# Interquartile Range Calculator

 Calculate IQR and detect outliers using the 1.5×IQR rule. Use this free browser-based interquartile range calculator from XTRAW Tools.

 **Interquartile Range Calculator** helps you calculate IQR and detect outliers using the 1.5×IQR rule. Use this free browser-based calculator from XTRAW Tools to compare inputs, estimate results, and plan your next step.

## How to Use the Interquartile Range Calculator

1. Enter the required calculator inputs shown in the form.
2. Review the dataset, sample, confidence level, contingency table, loan amount, rate, or payment assumptions.
3. Run the calculator, then adjust one input at a time to compare scenarios or check your estimate.

## What This Calculator Helps With

Calculate IQR and detect outliers using the 1.5×IQR rule. It is designed for students, teachers, researchers, analysts, healthcare reference users, survey planners, marketers, and anyone working with statistics who want a fast, browser-based estimate before relying on a spreadsheet, textbook, analytics platform, research software, lender, professional source, or specialist.

- Data (comma or space separated): 1, 3, 4, 7, 8, 9, 11, 15, 16, 60

## Common Uses

People use this calculator when they need a quick way to summarize data, compare statistical assumptions, review survey estimates, or check a statistics formula.

- **Math Solving:** Solve statistics, survey, research, classroom, data analysis, or probability questions from entered values.
- **Measurement:** Measure variation, percentiles, standard error, confidence intervals, risk, proportions, or dataset summaries.
- **Project Planning:** Plan research, surveys, experiments, reports, analysis, dashboards, or study workflows using transparent formulas.

## Formula or Method

IQR = Q3 − Q1; Fences = Q1 ∓ 1.5×IQR

## Example

**Example inputs:** Data (comma or space separated): 1, 3, 4, 7, 8, 9, 11, 15, 16, 60

**Example result:** Using the default dataset, Q1 is 4.75, Q3 is 14.00, and IQR is 9.25.

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- [Standard Deviation Calculator](https://xtraw.com/tools/standard-deviation-calculator)

## Interquartile Range Calculator FAQ

### Is the Interquartile Range Calculator free?

Yes. This calculator is free to use on XTRAW Tools.

### Do I need to create an account?

No. XTRAW tools are designed for browser-based use without requiring an account.

### Are the results exact?

Results may be estimates depending on the inputs, formula, rounding, statistical method, interpolation method, or purpose of the calculator. Always verify important results before relying on them.

**Disclaimer:** This calculator is provided for general informational, educational, and convenience purposes only. It is not legal, financial, medical, health, research, statistical consulting, academic, regulatory, safety, or professional advice. Always verify important results with a qualified professional, instructor, statistician, researcher, clinician, authoritative source, or appropriate specialist before making decisions.

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