Standard Deviation Calculator
Descriptive Statistics with Visualization
Compute mean, variance, standard deviation, and more from your dataset.
Switch between Population and Sample modes.
Enter Your Data
Results
No results: Enter your data and press Analyze.
Understand Your Results
- Mean: The arithmetic average of all your data values. Shows the center of your dataset.
- Variance: Measures how far data values spread out from the mean. Larger = more variability.
- Standard deviation (SD): Square root of variance, describes typical spread. Use population SD if your data is the whole group, sample SD otherwise (SD uses n-1 for samples, n for population).
- Median & Mode: Useful for understanding data skew and typical values.
- Min/Max, Range: The spread between the smallest and largest values in your data.
About This Calculator
This calculator is designed for PDF export on a single continuous page. Results and visualizations are printed in full (no scrollbars).
- All calculations are performed in the browser—no data leaves your device.
- Chart is optimized for exporting and will scale to fit the PDF page.