📈 Statistics

🎲Bayes' Theorem Calculator Update a probability with new evidence using Bayes' theorem — prior, true-positive rate and false-positive rate, free online. 🪙Binomial Probability Calculator Calculate exact and cumulative binomial probabilities, free online. 📊Chi-Square Test Calculator Run a chi-square goodness-of-fit test on observed and expected counts, free online. 📏Cohen's d Effect Size Calculator Calculate Cohen's d, Hedges' g and a confidence interval for the standardised difference between two group means, free online. 📐Confidence Interval Calculator Calculate a confidence interval for a sample mean, free online. 📊Correlation Coefficient Calculator Calculate the Pearson correlation coefficient between two lists of numbers, free online. 📊Descriptive Statistics Calculator Get the mean, median, mode, range, variance, standard deviation, quartiles, skewness and kurtosis of a data set in one go, free online. 🎯Expected Value & Variance Calculator Calculate the expected value, variance and standard deviation of a discrete random variable from its outcomes and probabilities, free online. 📈Linear Regression Calculator Fit a straight line to paired data and predict new values, free online. ⚖️Mann-Whitney U Test Calculator Compare two independent samples without assuming normality using the Mann-Whitney U (Wilcoxon rank-sum) test, free online. 📏Margin of Error Calculator Calculate the margin of error for a survey proportion, free online. 〰️Moving Average (SMA & EMA) Calculator Compute simple and exponential moving averages for a series of values and a window size, free online. 🔔Normal Distribution Calculator Find the z-score, cumulative probability, area between two values and the value at a given percentile of a normal distribution, free online. 🎰Odds ⇄ Probability Calculator Convert between probability and odds, free online. 🧮One-Sample T-Test Calculator Test whether a sample mean differs from a hypothesised value, free online. 🧮One-Way ANOVA Calculator Test whether three or more group means differ using a one-way ANOVA with F statistic, p-value and effect size, free online. 🚨Outlier Detector (IQR, Z-score & MAD) Calculator Spot outliers in a data set using the IQR rule, z-scores and the modified z-score (MAD), free online. 🎲P-Value Calculator Convert a z-score into one-tailed and two-tailed p-values, free online. 📞Poisson Distribution Calculator Calculate Poisson probabilities for a given average rate, free online. 📦Quartiles & Box Plot Summary Calculator Find the five-number summary, IQR, whisker limits and outliers for a box plot from your data, free online. 🔢Sample Size Calculator Calculate the sample size needed for a survey given confidence level and margin of error, free online. 📐Standard Deviation Calculator Calculate sample and population standard deviation, variance and mean, free online. 📏Standard Error Calculator Calculate the standard error of the mean from standard deviation and sample size, free online. ⚡Statistical Power & Sample Size (t-test) Calculator Find the sample size per group needed for a two-sample t-test, or the power you achieve with a given sample size, free online. 📐Variance Calculator (Sample & Population) Calculator Calculate sample and population variance and standard deviation, with the sum of squared deviations, from your data, free online. ⚖️Weighted Mean Calculator Calculate the weighted average of values with different weights, free online. 📉Z-Score Calculator Calculate a z-score from a value, mean and standard deviation, free online.