Standard Deviation Calculator
Calculate standard deviation for your dataset instantly. Supports both population and sample standard deviation calculations.
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How to Use This Calculator
Enter Data
Input your numerical values separated by commas or spaces
Choose Type
Select population or sample standard deviation
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View standard deviation, variance, and mean instantly
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Browse All Math CalculatorsFrequently Asked Questions
What is standard deviation?
Standard deviation is a measure of how spread out numbers are from their average (mean). A low standard deviation means data points are close to the mean, while a high standard deviation indicates data points are spread out over a wider range.
What's the difference between population and sample standard deviation?
Population standard deviation is used when you have data for the entire population and divides by N. Sample standard deviation is used when you have a sample from a larger population and divides by N-1 for better estimation.
How do you calculate standard deviation?
To calculate standard deviation: 1) Find the mean of your data, 2) Calculate the squared differences from the mean, 3) Find the average of those squared differences (variance), 4) Take the square root of the variance.