# Variance Calculator

> Compute sample and population variance, mean, count, and standard deviation from a list of numbers.

**URL:** https://www.calculatoranswers.com/variance-calculator
**Category:** Education

## Quick Answer

Calculate the sample or population variance for any data set. Choose which one you need, then read the variance in squared units alongside the standard deviation, mean, and count.

## Definition

A variance calculator measures how far the numbers in a data set are spread from their mean, expressed in the square of the data's units. It computes the population variance, which divides the sum of squared deviations by the count N, and the sample variance, which applies Bessel's correction by dividing by n - 1. Because variances of independent quantities add while standard deviations do not, variance is the form used inside analysis of variance, portfolio risk, and error propagation.

## How to Use

1. **Choose sample or population** — Select Sample if your numbers are a subset drawn from a larger group, or Population if they are the entire group. The choice changes the denominator and is shown in the result.
2. **Enter your dataset** — Type or paste your numbers separated by commas, spaces, semicolons, or new lines. Any entry that does not read as a number is named and blocks the calculation until it is corrected.
3. **Read the variance** — The variance appears first, with the standard deviation, mean, count, and sum of squared deviations beneath it, plus the formula and the substituted calculation.

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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