Statistics calculators

Statistics calculators summarize lists of numbers—means, spread, and related descriptive measures—using the formulas shown next to each form.

Sample versus population denominators matter for variance. The featured average tool is a direct arithmetic mean; other pages add median, mode, or standard deviation.

Statistics

Average Calculator

Compute the arithmetic mean of a list of numbers.
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Statistics

Coefficient of Variation Calculator

CV = SD / mean as a percent.
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Statistics

Confidence Interval Calculator

Mean ± z·s/√n confidence interval.
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Statistics

Correlation Calculator

Pearson r from two pasteable data columns.
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Statistics

Linear Regression Calculator

Slope and intercept from two pasteable data columns.
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Statistics

Mean Median Mode Calculator

Find the mean, median, and mode of a data set.
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Statistics

P-value Calculator

Two-tailed p-value for a one-sample z-test with known σ.
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Statistics

Percentile Rank Calculator

Percentile rank from counts below/at a score.
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Statistics

Sample Size Calculator

Sample size for a proportion estimate.
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Statistics

Standard Deviation Calculator

Sample or population standard deviation and variance.
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Statistics

Statistics Calculator

Summary stats: count, sum, mean, median, mode, min, max, stdev.
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Statistics

Z-score Calculator

Convert a raw score to a standard (z) score.
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