Mean, median and standard deviation calculator
Paste a list of numbers and get mean, median, standard deviation, min, max and sum.
Mean
18
Median15.5
Std. deviation (sample)13.4907
Min / Max4 / 42
Sum108
Count6
How the calculation works
The mean is the sum divided by the count. The median is the central value (sorted list). The standard deviation measures spread around the mean: √(Σ(x−mean)² ÷ (n−1)) (sample).
Frequently asked questions
Sample or population standard deviation?
We use the sample one (divides by n−1), the most common in applied statistics.
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Updated on June 18, 2026 · by Rafael Rossi · Methodology & sources