Standard Deviation Calculator
Quick answer: Enter a list of numbers to calculate mean, median, standard deviation, and variance.
Calculate all key descriptive statistics for any dataset: mean, median, range, variance, and standard deviation. Supports both sample standard deviation (÷n−1) and population standard deviation (÷n).
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Last reviewed: April 2026Report an error
8 values entered
Standard Deviation
2.1381
Std dev (sample): 2.1381. Mean: 5. Variance: 4.5714. Range: 2–9.
Std Deviation
2.1381
Mean
5
Median
4.5
Variance
4.5714
Min / Max
2 / 9
Count / Sum
8 / 40
Distribution Histogram (mean ± 1σ shaded)
Blue bars are within 1 standard deviation of the mean.
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How to Use This Std Deviation Calculator
- 1Enter your numbers separated by commas or spaces.
- 2Select sample or population standard deviation.
- 3Read mean, median, min, max, range, variance, and standard deviation.
Frequently Asked Questions
- Use sample (÷n−1) when your data is a sample of a larger population. Use population (÷n) when your data IS the entire population. In practice, sample is used almost universally in statistics.
- Standard deviation measures spread: how far values typically fall from the mean. Low SD = values cluster tightly; high SD = values are spread out.
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