Statistics & Data Analysis Calculators
Learn statistics by calculating it. These 40 free tools cover descriptive statistics, probability distributions, hypothesis testing, regression, and applied health measures. Every page includes a formula, worked example, common mistakes, FAQs, and practice questions.
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Descriptive Statistics
13 calculators for descriptive statistics.
Variance Calculator
Calculate sample or population variance from a list of numbers and see the mean, squared deviations, and standard deviation.
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Weighted Mean Calculator
Calculate a weighted average when values contribute unequally, such as course grades, portfolio returns, or survey scores.
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Median Absolute Deviation Calculator
Measure robust spread using the median absolute deviation, which is less sensitive to outliers than standard deviation.
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Coefficient of Variation Calculator
Compare relative variability across datasets with different units or means using the coefficient of variation.
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Standard Error Calculator
Calculate the standard error of a sample mean from the sample standard deviation and sample size.
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Percentile Rank Calculator
Find the percentage of observations below or at a selected value and understand its standing within a dataset.
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Quartile Calculator
Calculate the first quartile, median, and third quartile using linear interpolation.
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Interquartile Range Calculator
Calculate the interquartile range and middle 50% spread of a dataset.
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Outlier Calculator
Detect possible outliers using the 1.5ΓIQR rule and display the lower and upper fences.
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Five Number Summary Calculator
Find the minimum, first quartile, median, third quartile, and maximum of a dataset.
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Skewness Calculator
Measure the asymmetry of a dataset using adjusted sample skewness.
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Kurtosis Calculator
Calculate excess kurtosis to assess tail heaviness relative to a normal distribution.
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Covariance Calculator
Calculate sample or population covariance between two paired variables.
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Probability Distributions
9 calculators for probability distributions.
Normal Distribution Calculator
Find z-scores, cumulative probability, upper-tail probability, and density for a normal distribution.
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Binomial Probability Calculator
Calculate exact, cumulative, or upper-tail binomial probabilities for independent yes/no trials.
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Poisson Distribution Calculator
Calculate exact or cumulative probabilities for event counts occurring at an average rate.
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Geometric Distribution Calculator
Calculate the probability that the first success occurs on a specific trial or within a number of trials.
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Hypergeometric Distribution Calculator
Calculate probabilities for sampling without replacement from a finite population.
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Negative Binomial Calculator
Calculate the probability of a specified number of failures before a target number of successes.
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Exponential Distribution Calculator
Calculate waiting-time probabilities for a continuous exponential distribution.
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Uniform Distribution Calculator
Calculate density and cumulative probability for a continuous uniform distribution.
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Expected Value Calculator
Calculate the expected value and variance of a discrete probability distribution.
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Statistical Inference
11 calculators for statistical inference.
Sample Size Calculator
Estimate the required sample size for a population proportion using confidence level, margin of error, and expected proportion.
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Margin of Error Calculator
Calculate the margin of error for an estimated population proportion.
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One-Sample T-Test Calculator
Test whether a sample mean differs from a hypothesized population mean when population standard deviation is unknown.
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Two-Sample T-Test Calculator
Compare two independent sample means using Welchβs t-test, which does not assume equal variances.
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Paired T-Test Calculator
Test whether the average within-pair difference is zero using paired observations.
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Chi-Square Test Calculator
Calculate a chi-square goodness-of-fit statistic from observed and expected category counts.
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One-Way ANOVA Calculator
Compare the means of three or more independent groups with a one-way analysis of variance.
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F-Test Calculator
Compare two population variances with an F statistic and two-sided p-value.
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Statistical Power Calculator
Estimate the power of a two-sample, two-sided mean comparison using a normal approximation.
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P-Value from Z-Score Calculator
Convert a z-score into one-sided or two-sided p-values under the standard normal distribution.
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P-Value from T-Score Calculator
Convert a t statistic and degrees of freedom into a one-sided or two-sided p-value.
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Relationships & Applied Statistics
7 calculators for relationships & applied statistics.
Correlation Coefficient Calculator
Calculate Pearsonβs correlation coefficient for two paired numeric variables.
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Linear Regression Calculator
Fit a least-squares line to paired data and calculate slope, intercept, correlation, and RΒ².
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R-Squared Calculator
Calculate the coefficient of determination from observed and predicted values.
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Odds Ratio Calculator
Calculate an odds ratio and approximate 95% confidence interval from a 2Γ2 table.
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Relative Risk Calculator
Calculate relative risk, absolute risk difference, and approximate confidence interval from a 2Γ2 table.
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Sensitivity and Specificity Calculator
Calculate sensitivity, specificity, positive predictive value, negative predictive value, and accuracy.
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Number Needed to Treat Calculator
Calculate absolute risk reduction, relative risk reduction, and number needed to treat or harm.
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Use CalcNovaHub as a Statistics Learning Hub
Follow a simple learning path: understand the idea, inspect the formula, run a worked example, calculate your own data, and answer the practice questions.
1. UnderstandRead the plain-language explanation.
2. CalculateEnter your own values and inspect the breakdown.
3. PracticeOpen the answers only after solving each question.
4. ConnectMove to related calculators in the same topic cluster.