Statistics Calculators
Our statistics calculators help you analyze data, calculate probabilities, run hypothesis tests, and understand statistical distributions. Essential for researchers and data analysts.
20 calculators available
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Standard Deviation Calculator
Calculate the mean, variance, and standard deviation for a set of five numbers.
Z-Score Calculator
Calculate the z-score (standard score) for any value given the mean and standard deviation.
Confidence Interval Calculator
Calculate the confidence interval for a population mean given sample mean, standard deviation, and sample size.
Margin of Error Calculator
Calculate the margin of error for a survey or poll given sample size, confidence level, and proportion.
Weighted Average Calculator
Calculate the weighted average of three values with custom weights.
Variance Calculator
Calculate both population variance and sample variance for a set of five numbers.
Basic Probability Calculator
Calculate the probability, percentage probability, and odds of an event given favorable and total outcomes.
Expected Value Calculator
Calculate the expected value of a random variable with up to three outcomes and their probabilities.
Geometric Mean Calculator
Calculate the geometric mean of five positive numbers and compare it to the arithmetic mean.
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Interquartile Range (IQR) Calculator
Calculate the IQR and identify potential outlier fences from Q1 and Q3.
Coefficient of Variation Calculator
Calculate the coefficient of variation (CV) — the ratio of standard deviation to mean, expressed as a percentage.
Effect Size Calculator (Cohen's d)
Calculate Cohen's d to measure the practical significance of the difference between two group means.
Chi-Square Test Calculator
Calculate the chi-square statistic for a two-category goodness-of-fit or independence test.
Poisson Distribution Calculator
Calculate the probability of exactly k events in a Poisson distribution with mean rate λ.
Binomial Distribution Calculator
Estimate the probability of exactly k successes in n Bernoulli trials using the normal approximation.
Pearson Correlation Coefficient Calculator
Calculate Pearson's r to measure the linear relationship between two variables.
Five-Number Summary Calculator
Calculate the IQR, range, and outlier fences from a five-number summary (min, Q1, median, Q3, max).
Normal Distribution Calculator
Calculate the z-score and probability density for any value in a normal distribution.
Two-Sample T-Test Calculator
Calculate the t-statistic and degrees of freedom to compare the means of two independent groups.
Sample Size Calculator (Statistics)
Calculate the minimum sample size needed for a survey or study at a given confidence level and margin of error.
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