Standard Deviation Calculator
Paste a list of numbers to compute count, mean, sample variance, and sample standard deviation.
How it works
- 1
Enter your values in the fields.
- 2
Results update automatically as you type.
- 3
Use Reset to clear and try another scenario.
Why use this calculator
- Sample standard deviation
- Mean and variance
- Comma-separated input
- Stats homework helper
Sample vs population
This tool uses sample standard deviation (dividing by n−1), common for sample datasets.
How to enter data
Separate numbers with commas, spaces, or semicolons. Non-numeric tokens are ignored.
Frequently asked questions
Why n−1?
Sample variance uses n−1 (Bessel’s correction) by default here.
Minimum values needed?
At least two numbers.
Population std. dev.?
Not in this mode — results are sample-based.