Statistics & Probability Calculators

Turn raw data into decisions. These calculators cover descriptive statistics (mean, median, mode, standard deviation), correlation and linear regression, combinatorics, and probability distributions (normal, binomial, Poisson). Going deeper, you'll find z-scores, confidence intervals, t-tests, and chi-square tests for real hypothesis testing. Built for students, researchers, analysts, and anyone who wants evidence instead of guesses.

  • Binomial Distribution

    Calculate binomial probabilities for experiments with fixed trials and success probability.

  • Chi-Square Test

    Test goodness of fit or independence using the chi-square distribution.

  • Confidence Interval

    Calculate confidence intervals for population parameters.

  • Correlation Coefficient

    Calculate the Pearson correlation coefficient (r) to measure linear relationship between two variables.

  • Mean

    Calculate the arithmetic mean (average) of your data set.

  • Mean, Median, Mode & Range

    Calculate the measures of central tendency: mean, median, mode, and range.

  • Median

    Find the middle value (median) of your data set.

  • Mode

    Find the most frequently occurring value(s) in your data set.

  • Normal Distribution

    Calculate probabilities and areas under the normal (Gaussian) curve.

  • Permutation & Combination

    Calculate permutations (nPr) and combinations (nCr) for counting problems.

  • Poisson Distribution

    Calculate Poisson probabilities for events occurring in a fixed interval.

  • Probability

    Calculate basic probability and combined events.

  • Linear Regression

    Calculate the best-fit line for your data points.

  • Standard Deviation

    Calculate standard deviation and variance for population or sample data.

  • T-Test

    Perform hypothesis testing using the Student's t-distribution.

  • Z-Score

    Calculate z-scores for the standard normal distribution.