Standard Deviation Calculator – Calculate Std Dev
A standard deviation calculator measures spread around the average. You enter a set of values; we use the population formula (divide by n) to give the standard deviation. This article explains the formula and links to our calculator.
Quick Answer
| Label | Value |
|---|---|
| Values | 10, 12, 14, 16, 18 |
| Mean | 14 |
| Standard deviation | 2.83 |
How It Works
Population standard deviation = √(average of squared differences from the mean). We take the mean, subtract it from each value, square the differences, average them, and take the square root. This calculator uses the population formula (divide by n). For a sample, use n−1; we can add that option.
Additional Notes
Enter exactly 5 values in our current calculator. For more data points, use a spreadsheet or stats tool.
Use Our Calculator
Try our Standard Deviation Calculator for your own numbers: /calculators/standard-deviation-calculator
Related Calculators
A measure of how spread out the values are from the average.
This uses the population formula (divide by n). For a sample use n−1.
Our calculator accepts 5 values. For more, use another tool.