# Coefficient of Variation Calculator

URL: https://speedycalculator.com/calculators/statistics/coefficient-of-variation/
Last updated: 2026-10-25

> The coefficient of variation calculator divides the standard deviation by the mean to express spread as a percentage of the average. It compares variability between data sets with different units or scales.

## Inputs

- Data

## Results

- Coefficient of variation
- Standard deviation
- Mean

## Formula

```
CV = s ÷ x̄ × 100
```

## Explanation

A CV of 5% means values typically differ from the mean by about 5% of its size.

### How to use the Coefficient of Variation Calculator

- **Data**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Calculate the sample standard deviation and the mean, then divide.

### What each result means

- **Coefficient of variation** = stdev([Data])÷mean([Data])×100
- **Standard deviation** = stdev([Data])
- **Mean** = mean([Data])

## Worked example

Inputs — Data: 102, 98, 105, 97, 101, 99.

Results — **Coefficient of variation = 2.934 %**; Standard deviation = 2.9439; Mean = 100.3333.

## FAQ

**When is CV not meaningful?**
When the mean is near zero or the data can be negative.

**Is relative standard deviation the same?**
Yes, RSD is another name for CV.

**What formula does the Coefficient of Variation Calculator use?**
CV = s ÷ x̄ × 100.


## Sources

- [NIST/SEMATECH e-Handbook of Statistical Methods](https://www.itl.nist.gov/div898/handbook/)