Math & Education
Standard Deviation & Variance Calculator
Calculate population or sample variance and standard deviation.
Your inputs
Adjust the values
Population divides by N. Sample standard deviation uses N−1 to estimate variability from a sample.
Standard deviation
2
About this tool
A straightforward standard deviation & variance calculator
Calculate population or sample variance and standard deviation. Squared distances from the mean are divided by N for a population or N−1 for a sample before taking the square root.
Calculations retain browser floating-point precision and round only in the visible display. Inputs are processed in your browser, and changing a value updates the result immediately.
How it works
Use the Standard Deviation & Variance Calculator in three steps
- 1Enter your values
Enter a number list and choose population or sample calculation.
- 2Check the setup
Choose the units or calculation mode that matches your situation.
- 3Use the result
See standard deviation, variance, arithmetic mean, count, and selected method.
Common questions
Standard Deviation & Variance Calculator FAQ
How does the Standard Deviation & Variance Calculator work?
Squared distances from the mean are divided by N for a population or N−1 for a sample before taking the square root.
What information do I need?
Enter a number list and choose population or sample calculation.
How accurate is the result?
Calculations retain browser floating-point precision and round only in the visible display.