Standard Deviation Calculator Online
Find the standard deviation of any data set, with both sample and population formulas shown. Enter your numbers and see the worked-out steps.
Statistics Calculator
Calculate mean, median, mode, standard deviation, variance, quartiles, confidence intervals, z-scores, and more with visualizations
Enter your data above to see statistics
Supports comma-separated, space-separated, or newline-separated numbers
Formulas Reference
| Metric | Formula |
|---|---|
| Mean | Sum(x) / n |
| Variance (pop) | Sum((x - mean)^2) / n |
| Variance (sample) | Sum((x - mean)^2) / (n-1) |
| Std Deviation | sqrt(Variance) |
| Standard Error | SD / sqrt(n) |
| IQR | Q3 - Q1 |
| Coeff. of Variation | (SD / |Mean|) * 100% |
| Skewness | Sum(((x - mean) / SD)^3) / n |
| Kurtosis (excess) | Sum(((x - mean) / SD)^4) / n - 3 |
| Z-score | (x - mean) / SD |
| 95% CI | Mean +/- 1.96 * SE |
Quick Start
- 1Enter your numbers separated by commas or spaces
- 2Read the sample and population standard deviation results
- 3Open the Step-by-Step tab to see the formula and working
- 4Check the charts for a visual view of your data spread
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Looking for FAQs and advanced options? Visit the full Statistics Calculator page →