Statistics & Data Analysis

Scatter Plot Maker

Easily create customizable scatter plots to visualize relationships between two variables. Perfect for data analysis and presentations.

Pie Chart Generator

Generate beautiful pie charts online for free. Download as image or embed in your website. Easy to use pie chart maker with customizable colors and labels.

Doughnut Chart Generator

Generate beautiful doughnut charts online for free. Download as image or embed in your website. Easy to use doughnut chart maker with customizable colors and labels.

Bar Chart Generator

Generate beautiful bar charts online for free. Download as image or embed in your website. Easy to use bar chart maker with customizable colors and labels.

Line Chart Generator

Generate beautiful line charts online for free. Download as image or embed in your website. Easy to use line chart maker with customizable colors and labels.

Bubble Chart Generator

Generate beautiful bubble charts online for free. Download as image or embed in your website. Easy to use bubble chart maker with customizable colors and sizes.

Average Calculator

Calculate average, median, mode, standard deviation, and other statistical measures from your data set. Free online average calculator with step-by-step calculations.

Standard Deviation Calculator

Free online standard deviation calculator that calculates population and sample standard deviation from your data set. Perfect for statistics, data analysis, and research with step-by-step solutions.

Weighted Average Calculator

Calculate weighted average online with our free calculator. Enter values and weights to get instant weighted mean results with step-by-step calculations.

Variance Calculator

Calculate variance for population and sample data sets with step-by-step solutions and detailed explanations.

Table Chart Generator

Free online table chart generator to create beautiful data tables with customizable styling, sorting, filtering, and export options. Perfect for data visualization, reports, and presentations. No registration required.

Visualize JSON Data Graph

Visualize JSON data as interactive graphs and charts. Free online JSON data visualization tool.

Visualize Time Intervals

Visualize the given time intervals on a chart.

Visualize Date Intervals

Visualize the given date intervals on a chart.

Mean Median Mode Range Calculator

Calculate mean, median, mode, and range of any data set. Free online statistics calculator with instant results and detailed analysis.

Probability Calculator

Calculate probabilities of independent events including union, intersection, complement, and exclusive or. Free online probability calculator with instant results.

Z Score Calculator

Calculate z-scores from raw scores, mean, and standard deviation. Convert between z-scores and probabilities with our free online z-score calculator.

Sample Size Calculator

Calculate the minimum sample size needed for your surveys and studies with our free online sample size calculator. Also find margin of error with confidence level options.

Statistics Calculator

Compute comprehensive statistics including mean, standard deviation (population and sample), geometric mean, sum, sum of squares, and more with our free online statistics calculator.

Confidence Interval Calculator

Calculate confidence intervals and margin of error for your data with customizable confidence levels. Free online statistics calculator.

Percentile Calculator

Calculate percentiles for any data set using the standard PERCENTILE.INC formula. Free online percentile calculator with step-by-step solutions and statistics.

Quartile Calculator

Calculate quartiles Q1, Q2, Q3, interquartile range (IQR), median, min, max, and range for any data set. Free online quartile calculator with step-by-step solutions.

Stem and Leaf Plot Generator

Generate stem and leaf plots (stemplots) from your data set with automatic statistical calculations. Free online stem plot generator for data visualization.

Vote Percentage Calculator

Calculate vote percentages for candidates or ballot options. Free online vote percentage calculator for elections, polls, and surveys.

Linear Regression Calculator

Calculate linear regression line y = mx + b with slope, intercept, and coefficient of determination (R²) using least squares method. Free online linear regression calculator.

ANOVA Calculator

Perform one-way ANOVA test to determine if there are significant differences among group means. Includes complete ANOVA table, effect size measures, and step-by-step hypothesis testing.

Average Deviation Calculator

Calculate the average deviation (mean absolute deviation) of a dataset with step-by-step math and statistics summary.

Box and Whisker Plot Maker

Generate professional box and whisker plots with interactive visualization, comprehensive statistics, quartile analysis, and outlier detection.

Central Limit Theorem Calculator

Calculate probabilities using the Central Limit Theorem with step-by-step solutions, Z-scores, and standard error calculations for sample means.

Chi-Square Test Calculator

Perform a chi-square test of independence to determine association between two categorical variables. Get chi-square statistic, p-value, expected frequencies, and Cramer V effect size.

Coefficient of Variation Calculator

Calculate Coefficient of Variation (CV) with step-by-step formulas, data analysis, and comprehensive statistics for your datasets. Supports sample and population calculations.

Cohen's d Calculator

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

Confidence Interval for Proportion Calculator

Calculate the confidence interval for a population proportion based on sample size, number of successes, and confidence level.

Correlation Coefficient Calculator

Calculate Pearson and Spearman correlation coefficients between two datasets with scatter plot visualization.

Effect Size Calculator

Calculate effect sizes including Cohens d, Hedges g, Glass delta, eta-squared, omega-squared, and Cohens f from two groups, t-tests, ANOVA, or correlation.

Gaussian Distribution Generator

Generate random numbers following a Normal (Gaussian) Distribution with configurable mean, standard deviation, and sample size. Features interactive bell curve visualization, and statistical analysis.

Geometric Mean Calculator

Calculate the geometric mean of any dataset with step-by-step formulas, comparison with arithmetic and harmonic means, and interactive visualization.

Harmonic Mean Calculator

Calculate the harmonic mean of any dataset with step-by-step formulas, comparison with arithmetic and geometric means, and interactive visualization 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.

Kruskal-Wallis Test Calculator

Perform a Kruskal-Wallis H test online to compare three or more independent groups. Get instant p-values, test statistics (H), tie correction, and detailed ranking steps.

Mann Whitney U Test Calculator

Perform a Mann-Whitney U test on two independent groups and get critical values, z-scores, p-values, and a step-by-step ranks table.

Mean Calculator

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

Median Absolute Deviation Calculator

Calculate the Median Absolute Deviation (MAD) of any dataset with step-by-step formulas, scale factor options, outlier detection, and comparison to standard deviation.

Median Calculator

Calculate the median of any dataset with step-by-step explanations, quartiles, sorted data view, and a box plot visualization.

Mean Median Mode Calculator

Calculate mean, median, mode, and range with step-by-step formulas and interactive visualizations for any dataset.

Midrange Calculator

Calculate the midrange (arithmetic mean of maximum and minimum values) of any dataset. Get step-by-step formula breakdowns, min/max details, and sorted data analysis.

Negative Binomial Distribution Calculator

Calculate negative binomial distribution probabilities for modeling trials or failures needed to achieve r successes. Get PMF, CDF, step-by-step solutions, charts, and trial sequence visualizations.

Normal Distribution Calculator

Calculate probability density function (PDF), cumulative distribution function (CDF), and inverse normal distribution values with a beautiful interactive bell curve graph.

Five-Number Summary Calculator

Calculate the five-number summary (Minimum, Q1, Median, Q3, Maximum) for any dataset with IQR and box plot breakdown.

Absolute Uncertainty Calculator

Calculate absolute uncertainty, relative uncertainty, percent uncertainty, and measurement ranges with instant conversions.

A/B Test Calculator

Compare conversion rates between Control and Variation groups with statistical significance, p-value, z-score, and confidence intervals.

Bonferroni Correction Calculator

Adjust alpha levels and p-values for multiple statistical hypothesis tests using the Bonferroni correction method.

Box Plot Calculator

Calculate five-number summary statistics (minimum, Q1, median, Q3, maximum, IQR) and plot interactive box and whisker diagrams from raw data.

Boy or Girl Paradox Calculator

Calculate conditional probabilities for the Boy or Girl paradox (Two Children Problem) across classical variations and Monte Carlo simulation.

Chebyshevs Theorem Calculator

Calculate the minimum proportion of data within K standard deviations of the mean for any probability distribution using Chebyshev's Inequality.

Class Width Calculator

Calculate class width and class interval for histograms from minimum, maximum, and number of classes with step-by-step formulas.

Coin Flip Streak Calculator

Calculate the probability of exact, at least, or at most consecutive heads streaks in coin toss sequences with distribution breakdown.

Conditional Probability Calculator

Calculate conditional probabilities P(A|B), joint probabilities, and full probability tree values from event probabilities with step-by-step breakdown.

Constant of Proportionality Calculator

Calculate the constant of proportionality k from independent and dependent variable values for direct proportional relationships.

Descriptive Statistics Calculator

Compute full descriptive statistics including five-number summary, central tendency, dispersion, outliers, skewness, and kurtosis from any numeric dataset.

Dice Average Calculator

Calculate the expected average and standard deviation for any number of polyhedral dice including d4, d6, d8, d10, d12, and d20.

Dispersion Calculator

Measure statistical dispersion with range, variance, standard deviation, interquartile range, and quartile deviation for sample or population data.

Dot Plot Calculator

Create dot plots from numeric data with frequency stacks, mean, median, mode, range, and standard deviation summaries.

Empirical Rule Calculator

Calculate 1, 2, and 3 standard deviation ranges from mean and standard deviation using the 68-95-99.7 empirical rule.

Error Propagation Calculator

Propagate measurement uncertainties through addition, subtraction, multiplication, and division with quadrature formulas.

Expected Value Calculator

Calculate expected value E(X) from outcomes and probabilities with validation and step-by-step breakdown.

Exponential Distribution Calculator

Compute exponential distribution probabilities, mean, median, variance, and standard deviation from the rate parameter.

Exponential Growth Prediction Calculator

Predict future values or time to reach a goal from past exponential growth data with daily, weekly, monthly, or annual rates.

Exponential Regression Calculator

Fit an exponential curve y = ab^x to data points using least squares regression with R-squared.

False Positive Calculator

Calculate false positives, true negatives, and false positive rate from disease prevalence and test specificity.

False Positive Paradox Calculator

Explore the false positive paradox and compute positive predictive value from prevalence, sensitivity, and specificity.

Fisher's Exact Test Calculator

Compute one-tailed and two-tailed p-values and odds ratio for a 2x2 contingency table using Fisher's exact test.

Five Star Rating Calculator

Calculate weighted average star rating from 1-5 star vote counts with total votes and distribution breakdown.

Fractional Odds Calculator

Convert chances for and against success into fractional odds, win/lose probabilities, and streak probabilities.

Frequency Distribution Calculator

Build ungrouped or grouped frequency tables with cumulative frequency, mean, median, mode, and bar chart visualization.

Frequency Polygon Calculator

Build frequency polygon and cumulative ogive charts from data with summary statistics.

F Statistic Calculator

Compute F-statistic for variance ratio tests and restricted regression model comparisons with p-values.

Geometric Distribution Calculator

Calculate geometric distribution probability, mean, variance, and standard deviation for Bernoulli trials.

Grouped Data Standard Deviation Calculator

Compute mean, variance, and standard deviation from grouped frequency tables with class intervals.

Hypergeometric Distribution Calculator

Calculate hypergeometric distribution probability, cumulative probabilities, mean, variance, and standard deviation for sampling without replacement.

Hypothesis Testing Calculator

Perform one-sample hypothesis testing with z-test or t-test, critical values, p-values, and accept or reject decisions.

Implied Probability Calculator

Convert American moneyline odds to implied probability percentage for sports betting analysis.

Index of Qualitative Variation Calculator

Calculate the index of qualitative variation (IQV) to measure diversity and variability in nominal categorical data.

Joint Probability Calculator

Calculate joint probability for independent or dependent events with P(A), P(B), and conditional probability inputs.

Lognormal Distribution Calculator

Compute lognormal distribution probabilities, quantiles, mean, variance, median, and mode from mu and sigma parameters.

Lottery Odds Calculator

Calculate lottery winning odds using combinations for balls drawn, pool size, and number of matches.

Matthews Correlation Coefficient Calculator

Compute Matthews correlation coefficient (MCC) from confusion matrix values with sensitivity, specificity, precision, and F1 score.

Normal Approximation Calculator

Approximate binomial probabilities with a normal distribution using continuity correction, z-scores, and rule-of-thumb checks.

Sampling Distribution Probability Calculator

Find probabilities for sample means from a population mean, standard deviation, and sample size using the normal sampling distribution.

OR Probability Calculator

Calculate probabilities for A or B, both events, exactly one event, and neither event using union and intersection formulas.

Outlier Calculator

Detect low and high outliers in a dataset with quartiles, IQR, fences, and a clear sorted summary.

Parrondo Paradox Calculator

Simulate Parrondo's paradox coin games and compare strategies to see how alternating losing games can produce a winning outcome.

Password Combination Calculator

Calculate how many password permutations exist for a given length and character set with optional uppercase, number, and symbol requirements.

Percentile Rank Calculator

Find the percentile rank of a data value within a dataset using the count of values less than or equal to x divided by sample size.

P Hat Calculator

Calculate sample proportion p-hat from the number of successes and sample size for polls, surveys, and inferential statistics.

Point Estimate Calculator

Find the best point estimate of a population proportion using MLE, Wilson, Laplace, and Jeffrey methods from successes and trials.

Poisson Distribution Calculator

Calculate Poisson probabilities P(X=x) and cumulative probabilities from rate lambda and number of occurrences.

Polynomial Regression Calculator

Fit linear through sextic polynomial regression models to data points with R-squared and coefficient display.

Pooled Standard Deviation Calculator

Calculate pooled standard deviation from two or more datasets using weighted sample variances.

Post-Test Probability Calculator

Calculate pre-test odds, post-test odds, and post-test probability from prevalence and likelihood ratios.

Probability Fraction Calculator

Convert event counts into simplified probability fractions, decimals, and percentages for one or many outcomes.

Probability of 3 Events Calculator

Find the probability that all, none, exactly one, or at least one of three independent events occurs.

Process Capability Index Calculator

Compute Cp and Cpk from specification limits, process mean, and standard deviation to evaluate capability.

P Value Calculator

Find one-tailed or two-tailed p-values from z, t, chi-square, and F test statistics with decision guidance.

Raw Score Calculator

Compute raw scores from mean, standard deviation, and z-score, or solve any missing variable from the same relationship.

Rayleigh Distribution Calculator

Evaluate Rayleigh distribution pdf, cdf, quantiles, probabilities, and summary measures from a scale parameter.

Relative Error Calculator

Calculate absolute error, relative error, and percent error from measured and actual values in real time.

Relative Frequency Calculator

Compute relative frequency, cumulative relative frequency, and percentages from ungrouped or grouped data in real time.

Relative Risk Calculator

Calculate relative risk from a 2x2 exposure table with confidence interval bounds and interpretation.

Relative Standard Deviation Calculator

Convert mean and standard deviation into relative standard deviation as a percentage of the mean.

Risk Calculator

Estimate expected loss as probability of failure times loss, then compare two options side by side.

Roulette Payout Calculator

Calculate roulette win probability, payout ratio, and expected return for European and American wheels.

Relative Standard Error Calculator

Compute relative standard error from sample mean and standard error as a percentage.

Sampling Distribution Sample Proportion Calculator

Find probabilities for sample proportions using normal approximation with z-scores.

Sampling Error Calculator

Calculate sampling error for sample proportions or sample means with confidence levels.

Standard Deviation Index Calculator

Calculate SDI bias from laboratory mean, consensus group mean, and group standard deviation with interpretation.

Sensitivity Calculator

Compute test sensitivity and optional specificity from true positive, false negative, true negative, and false positive counts.

Sensitivity and Specificity Calculator

Calculate sensitivity, specificity, PPV, NPV, likelihood ratios, and accuracy from a 2x2 confusion matrix.

Shannon Entropy Calculator

Compute Shannon information entropy from probability distributions with base 2, e, or 10.

SMp Distribution Calculator

Evaluate the SMp(x) flexible probability density function and tail probabilities from six shape parameters.

Spearmans Rank Correlation Calculator

Calculate Spearman rank correlation coefficient rho from paired x and y datasets with strength interpretation.

Standard Error Calculator

Compute standard error of the sample mean or sample proportion with confidence-ready formulas.

Standard Deviation of Sample Mean Calculator

Compute the standard deviation of the sampling distribution of the mean from population standard deviation and sample size.

T Statistic Calculator

Calculate the t-statistic from sample mean, population mean, sample size, and sample standard deviation.

Two Envelopes Paradox Calculator

Explore the two envelopes paradox with simulation and expected-value calculation modes.

Uniform Distribution Calculator

Calculate uniform distribution probabilities, PDF, CDF, quantiles, and summary statistics for U(a,b).

Upper Control Limit Calculator

Calculate upper and lower control limits from process mean, standard deviation, and sigma multiplier for SPC charts.

Venn Diagram Calculator

Compute union, intersection, set differences, and complements for two or three sets from cardinalities.

Weibull Distribution Calculator

Calculate Weibull CDF, PDF, quantiles, mean, variance, and survival probabilities from scale and shape parameters.

Youden Index Calculator

Compute Youden J statistic from sensitivity and specificity or a confusion matrix to compare diagnostic tests.

Z Test Calculator

Perform a one-sample z-test with known population standard deviation, z-score, p-value, and critical value decision.