Statistics Calculators
Analyze data with probability, distributions, and hypothesis testing.
23 calculators available
Descriptive
Standard Deviation Calculator
Find the standard deviation and variance of a data set.
Mean, Median & Mode Calculator
Calculate central tendency measures from a data set.
Statistics Calculator
Compute mean, median, mode, range, variance, and standard deviation for any data set.
Z-Score Calculator
Calculate z-scores from value, mean, and standard deviation.
Percentile Calculator
Calculate the percentile rank of a value in a data set.
Quartile Calculator
Calculate Q1, Q2 (median), Q3, and IQR for a dataset.
Range Calculator
Calculate the range, midrange, and data spread of a dataset.
Variance Calculator
Calculate variance and standard deviation for a data set.
Probability
Probability Calculator
Calculate the probability of single and combined events.
Normal Distribution Calculator
Calculate probabilities for normal (Gaussian) distribution.
Binomial Probability Calculator
Calculate binomial distribution probabilities.
Poisson Distribution Calculator
Calculate probabilities for Poisson-distributed events.
Bayes Theorem Calculator
Calculate posterior probability using Bayes
Hypothesis Testing
Sample Size Calculator
Determine the right sample size for surveys.
Confidence Interval Calculator
Calculate confidence intervals for means.
Margin of Error Calculator
Calculate the margin of error for survey results.
T-Test Calculator
Perform one-sample and two-sample t-tests for hypothesis testing.
Chi-Square Calculator
Perform chi-square goodness-of-fit and independence tests.
ANOVA Calculator
Perform one-way ANOVA to compare means across groups.
P-Value Calculator
Calculate p-values for hypothesis testing.
Regression
Linear Regression Calculator
Calculate the line of best fit (y = mx + b) for data points.
Correlation Coefficient Calculator
Calculate Pearson correlation coefficient between two variables.
R-Squared Calculator
Calculate the coefficient of determination (R²) for model fit.
About Statistics Calculators
Analyze data with probability, distributions, and hypothesis testing. CALTRX provides 23 free statistics calculators with step-by-step explanations, formulas, real-world examples, and expert tips. Every calculator is designed for clarity and accuracy, helping you understand not just the answer but the reasoning behind it.