Standard Deviation Calculator
Paste or type your numbers (separated by spaces, commas or new lines) to get the mean, variance and standard deviation.
About standard deviation
Standard deviation is a core statistic that tells you how much your data varies around the average. It’s used everywhere from school assignments to finance and science. This calculator gives you the mean, variance and both sample and population standard deviation in one go.
Frequently asked questions
What is standard deviation?
Standard deviation measures how spread out a set of numbers is. A low value means the numbers are close to the average; a high value means they’re more spread out.
Population vs sample — which should I use?
Use population standard deviation when your data is the entire group. Use sample standard deviation when your data is a sample drawn from a larger group.
How do I enter my numbers?
Type or paste them separated by spaces, commas or new lines — the calculator figures it out.
Related tools
Try the Average Calculator or Percentage Calculator.