Mean Calculator
Compute the arithmetic mean with full step-by-step breakdown. Also outputs range, variance, and standard deviation.
Median Calculator
Find the median instantly. Supports comma, space, or newline inputs with step-by-step solutions for odd and even counts.
Mean Median Mode Calculator
Calculate mean, median, and mode simultaneously with step-by-step solutions and frequency insights.
Descriptive Statistics Calculator
Mean, median, mode, variance, SD, quartiles, IQR, skewness, and kurtosis. The most complete single-dataset summary tool.
Standard Deviation Calculator
Calculate population (σ) and sample (s) standard deviation with a full formula breakdown showing every step.
Z Score Calculator
Enter a score, mean, and SD to get the z score instantly. Includes bell curve visualization and probability interpretation.
Five Number Summary Calculator
Find min, Q1, median, Q3, and max to summarize your dataset for box plots and exploratory data analysis.
Probability Calculator
Calculate basic, conditional, and joint probabilities for independent and dependent events with step-by-step solutions.
Conditional Probability Calculator
Calculate P(A|B) using the conditional probability formula. Shows how one event's occurrence changes another's probability.
Bayes' Theorem Calculator
Calculate posterior probability from prior, likelihood, and evidence. Shows step by step how new data updates predictions.
Expected Value Calculator
Calculate E(X) of a discrete probability distribution using outcomes and their corresponding probabilities.
Combination Calculator
Calculate C(n, r) — selecting r items from n without regard to order. Shows all factorial steps clearly.
T-Test Calculator
One-sample, paired, two-sample, and Welch's t-tests. Get t-value, p-value, CI, effect size, and full solutions.
Z-Test Calculator
One-sample and two-sample z-tests for when the population standard deviation is known.
Chi-Square Calculator
Goodness-of-fit and independence tests. Get expected frequencies, p-values, and degrees of freedom step by step.
ANOVA Calculator
One-way ANOVA for comparing multiple group means. F-statistic, p-value, and significance — step by step.
Confidence Interval Calculator
CI for means and proportions using z and t intervals. Margin of error, critical values, and visual results.
Effect Size Calculator
Cohen's d and related measures. Assess practical significance and interpret results beyond just the p-value.
Normal Distribution Calculator
Z-scores, probabilities, PDF, and CDF. Left-tail, right-tail, two-tailed, and inverse modes with bell curve visualization.
Binomial Distribution Calculator
Calculate PMF and CDF for a fixed number of independent trials with a constant success probability.
Poisson Distribution Calculator
Probability of a given number of events in a fixed interval when events occur at a known constant rate.
Normal Approximation Calculator
Estimate binomial probabilities using the normal approximation. Includes continuity correction and z-score steps.
Central Limit Theorem Calculator
Sampling distribution, standard error, and probability using the CLT. Essential for large-sample statistical inference.
Simple Linear Regression Calculator
Regression equation, slope, intercept, and R² with step-by-step explanation and scatter plot output.