Variance Calculator
Enter a list of numbers to calculate variance. Choose sample or population mode and see mean, standard deviation, count, min, and max.
Separate values with commas, spaces, or new lines.
| Metric | Value |
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Privacy: calculations run locally in your browser. No values are stored or transmitted.
How it works
Population variance: σ² = Σ(x−μ)² / N
Sample variance: s² = Σ(x−x̄)² / (N−1)
Examples
- Population example: 2, 4, 4, 4, 5, 5, 7, 9 → variance = 4
- Use sample mode when your values are only part of a larger group
When to use this tool
This tool is designed for quick, practical tasks such as everyday calculations, data formatting, or simple conversions. It is best used when you need fast results without installing software or using complex tools.
When to use
- Quick checks or one-time calculations
- Validating or converting data before using it elsewhere
- Simple tasks that do not require advanced software
When not to use
- Critical financial, legal, or medical decisions
- Large-scale or automated processing
- Situations requiring guaranteed precision beyond basic validation
Always review results before using them in important contexts.
About this tool
This tool helps you perform quick utility operations directly in your browser. It runs entirely in your browser without sending data to a server.
You can use this tool when handling simple tasks without installing additional software. The results should be interpreted as a processed output based on your input data.
FAQ
- What is variance?
Variance measures how far values are spread from the mean. It is the average squared deviation from the mean.
- What is the difference between sample and population variance?
Population variance divides by N. Sample variance divides by N−1 to estimate the variance of a larger population.
- Why is variance squared?
Variance uses squared deviations so positive and negative differences do not cancel each other out.
- Are my values stored?
No. All calculations run locally in your browser and are not sent to a server.