Free Online Standard Deviation Calculator
This free standard deviation calculator runs entirely in your browser — no signup and no file uploads. Compute sample or population standard deviation and variance from a list of numbers.
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Inputs
Results
- Count
- 8
- Mean
- 5
- Population σ
- 2
- Sample s
- 2.13809
- Variance (pop)
- 4
How to use this free tool
- Paste numbers.
- Choose sample or population.
- Calculate.
- Read stdev and variance.
Formula
s = sqrt( Σ(x−mean)² / (n−1) )
Examples
Sample
Input: 2,4,4,4,5,5,7,9
Output: s ≈ 2.14
Related searches
People looking for a standard deviation calculator often also search for stddev calculator, sample standard deviation, population stdev, variance calculator, stdev calculator, and stddev tool. This page covers that search cluster without duplicate URLs.
FAQ
Sample vs population?
Sample uses n−1 (Bessel); population uses n.
Is variance shown?
Yes—variance is stdev squared.
Need mean first?
Mean is computed internally.
How do I use a free standard deviation calculator?
This free standard deviation calculator runs entirely in your browser — no signup and no file uploads. Use the free tool above for instant results — no signup, browser-based, and private.
What is a standard deviation calculator?
This free standard deviation calculator runs entirely in your browser — no signup and no file uploads. Use the free tool above for instant results — no signup, browser-based, and private.
Is there a free online calculator for standard deviation?
This free standard deviation calculator runs entirely in your browser — no signup and no file uploads. Use the free tool above for instant results — no signup, browser-based, and private.
How does the standard deviation calculator work?
This free standard deviation calculator runs entirely in your browser — no signup and no file uploads. Use the free tool above for instant results — no signup, browser-based, and private.
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