Statistics Calculators

Quartile Calculator Finds the quartile from the numbers you enter. Enter the mean / value, standard deviation, and sample size. Open calculator → Confidence Interval for Proportion Calculator Finds the confidence interval for proportion from the numbers you enter. Enter the mean / value, standard deviation, and sample size. Open calculator → Expected Value Calculator Finds the expected value from the numbers you enter. Enter the mean / value, standard deviation, and sample size. Open calculator → Joint Probability Calculator Finds the joint probability from the numbers you enter. Enter the trials / population, successes / selections, and probability. Open calculator → Correlation Coefficient Calculator Calculate Pearson correlation between paired X and Y values. Open calculator → Number of Outcomes Calculator Calculate possible outcomes for repeated independent trials. Open calculator → Lognormal Distribution Calculator Calculate lognormal-distribution probabilities and moments. Open calculator → Critical Value Calculator Calculate critical values for common Z, t, chi-square and F tests. Open calculator → Chi Square Goodness of Fit Calculator Test whether observed frequencies match expected frequencies. Open calculator → Outlier Calculator Identify potential outliers using the 1.5×IQR rule. Open calculator → Number Needed to Treat Calculator Calculate NNT from absolute risk reduction. Open calculator → Decile Range Calculator Calculate the spread between selected deciles. Open calculator →