Free Statistical Tools
Professional-grade calculators for quartiles, box plots, standard deviation, percentiles, and outlier detection. Calculations run in your browser, so input data does not need to be uploaded.
Core Calculators
Box Plot Calculator
Create professional box & whisker plots instantly. Visualize data distribution with automatic quartile calculation and outlier detection.
Open Calculator βIQR Calculator
Calculate the Interquartile Range and detect outliers using the 1.5ΓIQR rule across multiple algorithms.
Open Calculator β5-Number Summary
Get Min, Q1, Median, Q3, Max for your dataset in one click. The foundation of every box plot visualization.
Open Calculator βStandard Deviation
Calculate sample & population standard deviation, variance, mean, and coefficient of variation.
Open Calculator βPercentile Calculator
Calculate any percentile (25th, 50th, 75th, 90th, 95th, 99th) for test scores, benchmarks, and data analysis.
Open Calculator βTukey Hinges Calculator
The classic textbook method for quartile calculation. Perfect for homework, exams, and manual verification.
Open Calculator βSpecialized Tools
Excel Quartile Calculator
Calculate quartiles using Excel's QUARTILE.INC and QUARTILE.EXC methods. Verify your spreadsheet results.
Open Calculator βIQR Outlier Detector
Find outliers in your dataset using the IQR method with Tukey fences. Identify mild and extreme outliers.
Open Detector βMAD Outlier Calculator
Robust outlier detection using Median Absolute Deviation. More resistant than IQR for skewed distributions.
Open Calculator βAlgorithm Comparison
Compare quartile results across Tukey, Excel, R/Python, and WolframAlpha methods side by side.
Open Comparison βDescriptive Statistics
Complete descriptive statistics: mean, median, mode, skewness, kurtosis, and more in a single analysis.
Open Calculator βLearn Statistical Concepts
Explore our knowledge base of 25+ articles on quartiles, box plots, outlier detection, and statistical methods.