Statistics Calculator
Mean, median, mode, standard deviation, quartiles, and outliers — with a histogram and box plot drawn from your data.
How it works
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Paste or type your numbers, separated by commas, spaces, or new lines.
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Read the summary instantly: count, sum, mean, median, mode, range, variance, and standard deviation.
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Check the quartiles, IQR, and any outliers flagged by the 1.5×IQR rule.
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Explore the histogram and box plot, and download the histogram as a PNG.
Frequently asked questions
What is the difference between sample and population standard deviation?
The population formula divides the squared deviations by n and describes a complete data set. The sample formula divides by n−1 (Bessel's correction) and is the right choice when your data is a sample drawn from a larger population. We show both, so you can pick the one your course or paper requires.
Which quartile method do you use?
The median-exclusive method (the one used by TI-83/84 calculators and most statistics textbooks): the sorted data is split into a lower and an upper half, excluding the median itself when the count is odd, and Q1 and Q3 are the medians of those halves. Other tools sometimes use interpolated quartiles, so small differences are normal.
How are outliers detected?
With the standard 1.5×IQR rule: any value below Q1 − 1.5×IQR or above Q3 + 1.5×IQR is flagged as an outlier and listed. The box plot whiskers extend only to the most extreme values inside those fences.
Is my data uploaded anywhere?
No. All calculations run entirely in your browser — nothing is uploaded or stored on any server. Your numbers never leave your device.
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