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Free statistics calculators for mean, median, mode, standard deviation, z-scores, and probability. Analyze data with step-by-step solutions.
Calculate weighted mean with custom weights
Calculate standard deviation and variance
Calculate variance and analyze data spread
Calculate z-score, percentile, and probability
Calculate p-value from z, t, chi-square, or F statistics
Calculate arithmetic, geometric, harmonic, and weighted mean
Calculate slope, intercept, R², and correlation coefficient
Find the middle value of a dataset quickly
Calculate all three measures of central tendency at once
Calculate binomial probabilities for success/failure experiments
Calculate MAD to measure data spread around the mean or median
Calculate Q1, Q2, Q3, IQR, and five-number summary
Calculate IQR, quartile deviation, and detect outliers
Detect statistical outliers using IQR, Z-Score, and Modified Z-Score methods
Calculate Poisson probabilities for event occurrence rates
Calculate Pearson and Spearman correlation between two variables
Perform one-sample, two-sample, and paired t-tests for hypothesis testing
Perform one-way ANOVA analysis to compare means across multiple groups
Calculate covariance between two datasets to measure how they vary together
Calculate minimum, Q1, median, Q3, maximum, IQR, and detect outliers with box plot visualization
Analyze data with confidence using our comprehensive statistics calculators. From basic descriptive statistics like mean and standard deviation to advanced probability calculations and hypothesis testing, our tools help students, researchers, and professionals make sense of data.
Calculate mean, median, mode, range, variance, standard deviation, and more from a single data entry.
Compute probabilities for normal distributions, binomial events, and other statistical scenarios.
Determine the right sample size for surveys and experiments to achieve statistical significance.
See your data visualized with charts and graphs to better understand distributions and patterns.
Learn how each statistic is calculated with clear explanations and formula breakdowns.
Copy results or share calculations for reports, homework, or collaborative analysis.
Choose the calculator that matches your analysis needs - descriptive stats, probability, or hypothesis testing.
Enter your data values separated by commas or paste from a spreadsheet.
View comprehensive results including all relevant statistics for your data.
Interpret the results using the provided explanations and visual aids.
Use the statistics in your reports, research papers, or decision-making.
Analyze survey results, experimental data, and research findings with proper statistical methods.
Understand sales trends, customer behavior patterns, and performance metrics through data analysis.
Monitor manufacturing processes, detect variations, and maintain product quality standards.
Practice statistics concepts, verify homework answers, and understand statistical formulas.
Population statistics describe an entire group, while sample statistics describe a subset. Sample standard deviation divides by (n-1) instead of n to provide an unbiased estimate of the population parameter.