Standard Deviation Calculator
Paste or type your data and get full descriptive statistics instantly — mean, median, mode, variance, standard deviation, quartiles, and more.
Count (n)
Sum
Mean (Average)
Median
Mode
Range
Minimum
Maximum
Standard Deviation & Variance
Population Std Dev (σ)
Sample Std Dev (s)
Population Variance (σ²)
Sample Variance (s²)
Quartiles & IQR
Q1 (25th percentile)
Q2 / Median (50th)
Q3 (75th percentile)
IQR (Q3 − Q1)
Sorted Data
Q1
Median
Q3
How to use
- Enter your numbers in the text area, separated by commas or on separate lines.
- Click Calculate to compute all statistics at once.
- Population standard deviation (σ) divides by n — use when your data is the entire population.
- Sample standard deviation (s) divides by n−1 — use when your data is a sample from a larger group.
- The sorted data view highlights Q1 (green), the median (teal), and Q3 (yellow) for quick reference.
- Use Copy Results to copy all statistics to your clipboard.