Standard Deviation Calculator
Calculate standard deviation and variance
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How to Use Standard Deviation Calculator
Enter data
Enter numbers separated by commas.
Select mode
Choose population or sample.
Results
See mean, variance, and std dev.
Why Choose AllTools Standard Deviation Calculator?
- ✓ Population σ
- ✓ Sample s
- ✓ Mean
- ✓ Variance
- ✓ Step-by-step
- ✓ No data stored
Why Use This Tool
- ★ Instant calculations with no server round-trip
- ★ Completely free with no usage limits
- ★ No account or registration required
- ★ Accurate results using standard mathematical formulas
- ★ Works on any device including phones and tablets
Related Resources
Frequently Asked Questions
Population vs sample? ▼
Population uses N in the denominator (entire group). Sample uses N-1 (Bessel correction) for a subset.
Population vs sample? ▼
Population divides by N, sample divides by N-1 (Bessel correction) for estimation from a sample.
Does this work on mobile? ▼
Yes. All AllTools calculators are fully responsive and work on phones and tablets.
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