Mean, Median and Standard Deviation Explained
The core statistics everyone should know — mean, median, mode, range and standard deviation — what each tells you, when averages mislead, and how the normal distribution ties them together.
Coefficient of Variation Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Coefficient of variation
15.00%
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Coefficient of Variation Calculator
The Coefficient of Variation Calculator works out your coefficient of variation in an instant. Enter standard deviation and mean and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the standard deviation.
- Enter the mean.
- Read off your coefficient of variation — the calculator updates automatically, with no button to press.
Formula
The Coefficient of Variation Calculator uses the formula:
Coefficient of variation = Standard deviation ÷ Mean × 100
Worked example
For example, with standard deviation of 15 and mean of 100, the coefficient of variation is 15.00%.
| Standard deviation | 15 |
|---|---|
| Mean | 100 |
| Coefficient of variation | 15.00% |
|---|
Results are estimates for educational use, not professional advice.
Key terms explained
- Standard deviation
- A measure of how spread out a set of values is around their mean.
- Mean
- The average of a set of numbers — their sum divided by how many there are.
Frequently asked questions
It is the standard deviation divided by the mean, as a percentage. An SD of 15 with a mean of 100 gives a CV of 15%.
It expresses spread relative to the mean, so you can compare variability between data sets that have different units or scales.
There is no fixed cutoff, but a higher CV means more relative variability. Compare CVs within the same context to judge consistency.
It is best used with positive, ratio-scale data. With means near zero or negative, the CV becomes unstable or hard to interpret.
The Coefficient of Variation Calculator uses the formula: Coefficient of variation = Standard deviation ÷ Mean × 100. For example, with standard deviation of 15 and mean of 100, the coefficient of variation is 15.00%.
Enter the standard deviation. Enter the mean. Read off your coefficient of variation — the calculator updates automatically, with no button to press.
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