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Home › Math Calculators › Variance Calculator

Variance Calculator

Calculate the variance of a dataset.

Statistics
Enter the dataset separated by commas.
Population for full data; Sample for a subset.
Formula
σ² = Σ(xᵢ−μ)² / N
Variance measures how far data points spread from the mean. Population variance divides by N; sample by N−1.

Result

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Calculation Breakdown

STEP-BY-STEP DETAILS

ParameterValue
Result—

About Variance Calculator

Variance is the average of squared differences from the mean. It quantifies the spread of a dataset. The square root of variance is the standard deviation. Variance is widely used in statistics, finance (portfolio risk), and quality control.

ℹ️ About Variance Calculator

Calculate the variance of a dataset — the average squared deviation from the mean. The square of standard deviation.

📋 How to Use

  1. Enter the required values in the input fields.
  2. Select the operation type if multiple options are available.
  3. Click Calculate.
  4. View the result and step-by-step breakdown.

🔢 Formula / Calculation Method

Variance = Σ(x − x̄)² ÷ N

Dataset 2,4,4,4,5,5,7,9 → Variance = 4

👥 Who Uses It

  • Students solving math homework
  • Teachers creating lesson examples
  • Engineers and scientists
  • Finance professionals
  • Programmers and developers

📌 Practical Examples

Example 1
Dataset 2,4,4,4,5,5,7,9 → Variance = 4
Verification
Use the formula shown to manually verify the result.
Real World
Apply the result to your specific problem.
Study Aid
Practice with different input values to learn.

⭐ Benefits

🎯
Accurate
Mathematically precise results
⚡
Instant
No waiting for calculations
📋
Formula
Understand the math behind it
📱
Mobile
Works on any device
🆓
Free
No cost or registration
📊
Breakdown
Step-by-step where possible

💡 Tips

  • 💡Double-check your input values before calculating.
  • 💡Use the formula shown to understand how the result is derived.
  • 💡For decimals, use a period (.) as the decimal separator.
  • 💡Try different values to understand how the result changes.

❓ Frequently Asked Questions

How accurate is the result?
Results use JavaScript's 64-bit floating point — accurate to 15+ significant digits for most calculations.
Can I enter decimal numbers?
Yes, decimals are fully supported.
Is it free?
Yes, completely free.
Does it show the formula?
Yes, the formula is displayed on the page.
Can I use it on mobile?
Yes, the calculator is fully responsive.
Does it save my inputs?
No data is stored — all calculations are done locally in your browser.
What if I get an error?
Check for invalid inputs such as division by zero or negative square roots.

🔗 Related Calculators

🔢Scientific Calculator 📊Percentage Calculator 📐Pythagorean Theorem 📉Standard Deviation 🔢Fractions Calculator ➕Addition Calculator

🚀 Features

⚡
Instant Results
Calculate in seconds, no waiting
🎯
High Accuracy
Precise results every time
📱
Mobile Friendly
Works on any device or screen size
🔒
Privacy First
No data stored or shared
🌍
Works Worldwide
Available 24/7 from anywhere
🆓
100% Free
Always free, no registration needed

⚠️ Common Mistakes to Avoid

  • ⚠️Entering values in the wrong fields.
  • ⚠️Using commas instead of periods as decimal separators.
  • ⚠️Dividing by zero — this is undefined.
  • ⚠️Not selecting the correct mode (degrees vs radians for trig).

📢 Disclaimer

Results are provided for informational purposes only and should be verified before making important financial, academic, or engineering decisions.

📚 Cite & Reference This Calculator

Verified Standard Calculation

Need to cite this calculator for academic papers, engineering notes, or school assignments? Use the reference below:

OnlineConvers. (2026). Variance Calculator. Retrieved from https://www.onlineconvers.com/math/variance-calculator