Statistics Calculators

Standard Deviation Calculator

Calculate standard deviation and variance from a list of numbers.

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Mean, Median & Mode Calculator

Calculate the mean, median, mode, and range of a data set.

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Percentile Calculator

Find a value's percentile rank, or the value at a given percentile.

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Z-Score Calculator

Calculate a z-score and its corresponding percentile.

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Combination & Permutation Calculator

Calculate nCr (combinations) and nPr (permutations) instantly.

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Sample Size Calculator

Find the minimum sample size needed for a survey or study.

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Confidence Interval Calculator

Calculate a confidence interval for a sample mean.

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Correlation Coefficient Calculator

Measure the linear relationship between two paired data sets.

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Probability Calculator

Calculate probability for a single event or two combined events.

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Weighted Average Calculator

Calculate a weighted average from any values and weights.

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Outlier Calculator (IQR Method)

Find outliers in a data set using the IQR method.

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Coefficient of Variation Calculator

Calculate the coefficient of variation to compare variability across data sets.

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Range Calculator

Find the range of a data set instantly.

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Empirical Rule Calculator

Find the 68%, 95%, and 99.7% ranges around a mean.

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Standard Error Calculator

Calculate the standard error of the mean.

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Geometric Mean Calculator

Calculate the geometric mean, the correct average for growth rates.

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Harmonic Mean Calculator

Calculate the harmonic mean, the correct average for rates.

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Interquartile Range Calculator

Calculate Q1, Q3, and the interquartile range of a data set.

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Margin of Error Calculator

Calculate margin of error for a survey or poll.

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Relative Frequency Calculator

Calculate the relative frequency percentage for each category.

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Five Number Summary Calculator

Calculate the five number summary of a data set.

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