ANOVA Calculator - Perform one-way ANOVA test to determine if there are significant differences among group means. Includes complete ANOVA table, effect size (eta-squared, omega-squared), interactive visualizations, and step-by-step hypothesis testing.

Arithmetic Mean Calculator - Calculate the arithmetic mean (average) of a set of numbers with comprehensive statistical analysis including median, mode, range, standard deviation, variance, and interactive data visualization. Featured

Average Calculator - Calculate mean, median, mode, geometric mean, harmonic mean, and weighted average with complete statistical analysis, visualizations, and step-by-step solutions. Featured

Average Deviation Calculator - Calculate the average absolute deviation (AAD) of a dataset from the mean or median. Includes step-by-step calculations, visual distribution chart, and comprehensive statistical analysis. Featured

Box and Whisker Plot Maker - Generate professional box and whisker plots with interactive visualization, comprehensive statistics, quartile analysis, outlier detection, and step-by-step calculations.

Chi-Square Test Calculator - Perform a chi-square test of independence to determine if there is a significant association between two categorical variables. Get chi-square statistic, p-value, expected frequencies, cell contributions, and Cramer's V effect size with step-by-step calculations.

Coefficient of Variation Calculator - Calculate Coefficient of Variation (CV) with step-by-step formulas, visual comparison charts, data quality assessment, and comprehensive statistical analysis for your datasets.

Cohen's d Calculator - Calculate Cohen's d effect size to measure the standardized difference between two group means. Features step-by-step calculations, interactive visualization, effect size interpretation, and support for both raw data and summary statistics.

Compound Growth Calculator - Calculate compound annual growth rate (CAGR), future value, initial value, or time periods with interactive growth charts, detailed breakdowns, and comprehensive analysis for investments and business growth. Featured

Confidence Interval Calculator - Calculate confidence intervals for means and proportions with interactive visualization, t-distribution and z-distribution support, step-by-step calculations, and sample size recommendations.

Confidence Interval for Proportion Calculator - Calculate confidence intervals for population proportions using Wald (normal approximation) or Wilson score methods. Get step-by-step solutions, visual diagrams, margin of error analysis, and practical interpretation guidance. New

Correlation Coefficient Calculator - Calculate Pearson, Spearman, and Kendall correlation coefficients with interactive scatter plot, regression analysis, p-values, and step-by-step calculation breakdown.

Geometric Mean Calculator - Calculate the geometric mean of any dataset with step-by-step formulas, interactive visualization, comparison with arithmetic mean, and comprehensive statistical analysis.

Harmonic Mean Calculator - Calculate the harmonic mean of a data set with step-by-step formulas, comparison with arithmetic and geometric means, interactive visualization, and practical examples for rates, speeds, and financial analysis.

Histogram Maker - Create beautiful histograms online with comprehensive statistical analysis including mean, median, mode, skewness, kurtosis, and distribution shape detection. Supports auto-optimal bin calculation and PNG export.

Interquartile Range Calculator - Calculate the interquartile range (IQR), quartiles Q1, Q2, Q3, five-number summary, and detect outliers with interactive box plot visualization and step-by-step calculations.

Kruskal-Wallis Test Calculator - Perform Kruskal-Wallis H test to compare multiple independent groups. Get step-by-step calculations, rank analysis, effect size, and interactive visualization for non-parametric statistical analysis.

Linear Regression Calculator - Calculate linear regression equation, slope, intercept, R-squared, and make predictions with interactive scatter plot visualization and step-by-step formula breakdown.

Logarithmic Growth Calculator - Calculate logarithmic growth over time using natural log (e), base 10, or base 2. Visualize growth curves, view year-by-year breakdowns, and understand step-by-step calculations.

Mann-Whitney U Test Calculator - Perform the Mann-Whitney U test (Wilcoxon rank-sum test) to compare two independent samples. Get U statistic, p-value, effect size, step-by-step calculations, and interactive visualizations.

Mean Absolute Deviation (MAD) Calculator - Calculate Mean Absolute Deviation with step-by-step formulas, interactive visualization, and comprehensive statistical analysis. Understand data variability with our free MAD calculator.

Mean Calculator - Calculate the arithmetic mean (average) of any dataset with interactive visualization, step-by-step formula breakdown, and comprehensive statistics including sum, median, range, and standard deviation.

Mean Median Mode Calculator - Calculate mean, median, mode and range with step-by-step formulas, interactive visualization, frequency analysis, and comprehensive statistical breakdown for any dataset.

Median Absolute Deviation Calculator - Calculate the median absolute deviation (MAD) of a dataset with step-by-step formulas, interactive visualization, outlier detection, and robustness comparison to standard deviation.

Median Calculator - Calculate the median value of a set of numbers with step-by-step explanations, interactive visualizations, and comprehensive statistical insights. Featured

Midrange Calculator - Calculate the midrange of any dataset with step-by-step visualization showing the midpoint between maximum and minimum values, plus comprehensive statistics including mean, median, and range comparison.

Mode Calculator - Calculate the mode (most frequent values) of a dataset with interactive frequency visualization, step-by-step analysis, and comprehensive statistics.

Outlier Calculator - Identify statistical outliers in your dataset using the IQR (Interquartile Range) method. Calculate Q1, Q3, and detect values that fall outside the normal range with step-by-step calculations. Featured

Population Standard Deviation Calculator - Calculate population standard deviation (σ) with step-by-step calculations, interactive visualization, variance, mean, and data quality assessment for complete population datasets.

Quartile Calculator - Calculate quartiles (Q1, Q2, Q3), interquartile range (IQR), detect outliers, and visualize data distribution with interactive box plots and step-by-step calculations.

Quartile Deviation Calculator - Calculate the quartile deviation (semi-interquartile range) of a dataset with interactive box plot visualization, complete quartile analysis (Q1, Q2, Q3, IQR), outlier detection, and step-by-step calculation breakdown.

Range Calculator - Calculate the range of any dataset instantly with visual spread analysis, step-by-step calculations, quartile breakdown, and interactive data distribution chart.

Relative Standard Deviation Calculator - Calculate relative standard deviation (RSD) and coefficient of variation (%CV) with step-by-step formulas, interactive data visualization, statistical analysis, and data quality assessment. Featured

Root Mean Square Calculator - Calculate root mean square (RMS) of a set of numbers with step-by-step calculations, interactive visualization, AC/DC signal analysis, and statistical insights. Featured

Sample Mean Calculator - Calculate the sample mean (arithmetic average) of any dataset with step-by-step visualization, deviation analysis, data distribution chart, and comprehensive statistical insights.

Sample Size Calculator - Calculate the required sample size for surveys, research studies, and statistical analysis with confidence level, margin of error, and finite population correction. Get step-by-step formula breakdowns and visual confidence intervals.

Sample Standard Deviation Calculator - Calculate sample standard deviation with step-by-step formulas, interactive data visualization, outlier detection, empirical rule analysis, and comprehensive statistics including variance, mean, median, and range. Featured

Scatter Plot Maker - Create beautiful interactive scatter plots to visualize relationships between two variables. Features correlation analysis, trend lines, multiple styling options, and downloadable PNG charts.

Standard Deviation Calculator - Calculate standard deviation, variance, mean, and other statistics with step-by-step solutions and visualizations.

Standard Error Calculator - Calculate standard error of the mean (SEM) with step-by-step calculations, confidence intervals, data visualizations, and comprehensive statistical analysis for your dataset. Featured

Statistics Calculator - An all-in-one statistics calculator for count, sum, mean, median, mode, range, variance, standard deviation, geometric mean, harmonic mean, quartiles, outlier detection, and more.

t-Test Calculator - Perform Welch's t-test to determine if there is a statistically significant difference between the means of two independent groups.

Variance Calculator - Calculate sample variance and population variance with interactive visualization, step-by-step formulas, deviation analysis, and comprehensive statistical insights.

Z-Score Calculator - Calculate z-scores (standard scores) instantly with step-by-step formulas, interactive normal distribution visualization, probability lookup, percentile ranking, and statistical interpretation. New