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Coefficient of variation calculator

Compute the coefficient of variation (CV) of a dataset — its relative variability.

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The Coefficient of variation calculator turns Numbers (comma-separated) into Coefficient of variation, Mean, Standard deviation, instantly and for free. For instance, with Numbers (comma-separated) = 2, 4, 4, 4, 5, 5, 7, 9 it returns Coefficient of variation = 42.76%, Mean = 5 and Standard deviation = 2.138.

How to use it

  1. Enter your values: Numbers (comma-separated).
  2. Read the result instantly: Coefficient of variation, Mean, Standard deviation.

Frequently asked questions

How does the Coefficient of variation calculator work?

It takes Numbers (comma-separated) and derives Coefficient of variation, Mean and Standard deviation from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

A single value: Numbers (comma-separated). Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Numbers (comma-separated) = 2, 4, 4, 4, 5, 5, 7, 9, the calculator returns Coefficient of variation = 42.76%, Mean = 5 and Standard deviation = 2.138. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Numbers (comma-separated) = 2, 4, 4, 5, 6, 6, 9, 12 instead, Coefficient of variation goes from 42.76% to 52.7% — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Numbers (comma-separated) = 2, 4, 4, 4, Coefficient of variation comes out at 28.57%. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Summarising a dataset before drawing conclusions from it, checking whether a difference between two groups is real, and putting an interval around an estimate.

What is the most common mistake?

Reading a p-value as the probability that the hypothesis is wrong. It is the probability of seeing data at least this extreme if the null were true — a different statement, and a much weaker one.

What is the difference between the Coefficient of variation calculator and the Correlation coefficient calculator?

This one returns Coefficient of variation and Mean; the Correlation coefficient calculator returns Correlation coefficient (r). That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Gini coefficient calculator is the closest one after this: The Gini coefficient of a distribution — the standard measure of inequality, from 0 (everyone equal) to 1 (one person has everything). Paste any set of non-negative values — incomes, wealth, market shares — and it computes the Gini and expresses it as a percentage, the way income inequality is usually reported.

What else is worth having open alongside it?

Confidence interval calculator and Expected value calculator — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
ExplainerGeometric vs Arithmetic Mean: Which to UseThe arithmetic mean adds and divides; the geometric mean multiplies and takes a root. Learn which fits growth rates, ratios, and averages.ExplainerWhat Is a Percentile? The 90th Percentile ExplainedA percentile tells you where a value ranks within a group. Learn what the 90th percentile really means and why a percentile is not the same as a percentage.How-toHow to Calculate Percent Error: The Accuracy Formula for SciencePercent error tells you how close a measurement is to the true value. Learn the formula, work through an example, and see how scientists use it to judge accuracy.How-toHow to Calculate a Weighted AverageA weighted average gives some values more influence than others. Learn the Σ(w·x) / Σw formula with grade and portfolio examples you can follow step by step.How-toHow to Find a Cube Root by HandA step-by-step guide to finding a cube root by estimation and refinement — plus how it differs from a square root and when a value stays irrational.ExplainerHow Exponents Work: Powers and the Laws of ExponentsAn exponent is repeated multiplication. Learn the laws of exponents, what negative and fractional powers mean, and why anything to the zero is one.