Free statistics tools

Statistics Calculators

Use Statskan's statistics calculators to check descriptive statistics, probability distributions, confidence intervals, hypothesis tests, regression, correlation, and effect sizes. Each calculator is built for students who need the formula, result, and interpretation in one place.

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16 Statistics calculators and tools
4 Grouped by assignment type
Free Use calculators before you ask for help
Help Support available when interpretation gets tricky

Find the Right Statistics Calculator

Search by topic, formula, software-style output, or assignment wording. If you are not sure which tool fits, start with the group that matches the type of question.

Descriptive and planning

Summarize data, plan sample size, and calculate intervals before you write the interpretation.

Raw data Descriptive Statistics Calculator Mean, median, mode, range, quartiles, IQR, variance, standard deviation, and sample or population options. Open calculator Planning Sample Size Calculator Plan sample size for a mean or proportion with confidence level, margin of error, and finite population correction. Open calculator Intervals Confidence Interval Calculator Calculate confidence intervals for means and proportions with sample, population, and raw-data inputs. Open calculator Standard scores Z Score Calculator Convert raw scores to z-scores, z-scores to percentiles, percentiles to z-scores, and raw data to standardized values. Open calculator

Probability distributions

Find exact, cumulative, tail, range, and percentile probabilities for common statistics homework models.

Continuous Normal Distribution Calculator Normal probabilities, z-scores, percentile lookup, range probabilities, and bell-curve visual checks. Open calculator Discrete Binomial Distribution Calculator Exact, cumulative, at least, at most, and between binomial probabilities with chart and table. Open calculator Counts Poisson Distribution Calculator Exact, cumulative, and range Poisson probabilities for event counts and average rates. Open calculator Without replacement Hypergeometric Distribution Calculator Sampling-without-replacement probabilities for finite populations, successes, and sample counts. Open calculator

Tests and inference

Calculate test statistics, p-values, and common hypothesis-testing outputs before writing the conclusion.

P-values P-Value Calculator Calculate p-values for z, t, chi-square, and F statistics with one-tail and two-tail options. Open calculator Z test Z-Test Calculator Use z-test inputs to check a hypothesis test when the normal approximation or population standard deviation applies. Open calculator T test T-Test Calculator Check t-test calculations for sample mean, paired, or group-difference style problems. Open calculator ANOVA ANOVA Calculator Calculate and check ANOVA table outputs for comparing group means. Open calculator Chi-square Chi-Square Calculator Work with chi-square test statistics for categorical data and distribution-based problems. Open calculator

Relationships and effect size

Check association, regression, and practical significance after you calculate or receive output.

Correlation Correlation Coefficient Calculator Pearson and Spearman correlation, p-values, confidence interval, covariance, and scatterplot. Open calculator Regression Linear Regression Calculator Regression equation, slope, intercept, R-squared, residuals, prediction, and slope inference. Open calculator Effect size Effect Size Calculator Cohen's d, Hedges g, eta squared, omega squared, Cohen's f, R-squared conversions, and interpretation. Open calculator

How to Use These Calculators for Homework

Calculate

Use the calculator that matches your assignment question and copy the main result, formula, and assumptions.

Check

Compare the result with the test type, distribution, sample or population choice, and required rounding.

Interpret

Write the answer in context, including what the statistic means for the data or hypothesis.

Ask

If the assignment needs a full write-up, software output, or test-choice explanation, send the problem to Statskan for guided help.

Statistics Calculator FAQs

Which statistics calculator should I use first?

Start with the calculator that matches the question wording. Use descriptive statistics for raw data summaries, distribution calculators for probability questions, test calculators for hypothesis testing, and regression or effect-size calculators for interpretation.

Can these calculators replace my required software output?

They are useful for checking calculations and understanding results, but some assignments still require Excel, SPSS, R, Stata, or handwritten work. Use the calculator as a verification and learning tool.

Why do some calculators ask for sample or population?

Sample calculations estimate a larger population and often use n - 1 in the denominator. Population calculations describe the full group directly and use N.

Can Statskan help if I do not know which test to use?

Yes. Statskan can help identify the correct method, run or check the calculation, and explain the result in assignment-ready language.

Need the Answer Explained, Not Just Calculated?

Statskan can help you choose the correct statistical method, verify the calculator result, create Excel/SPSS/R/Stata output, and write the interpretation in clear homework-ready language.

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