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Calculation Machine

Coefficient of Variation Calculator

Relative variability — compare spread across different scales.

Reviewed by the Calculation Machine team · How we check our maths

Your values

ⓘ Live results

Results
Coefficient of variation
9.25%
Mean
44.6667
Sample SD
4.1312
Population SD
3.7712
Population CV
8.44%
Reading
Low variability (under 10%)

Quick answer

The coefficient of variation is the standard deviation divided by the mean, expressed as a percentage — a scale-free measure of relative spread.

The formula

CV = (s ÷ x̄) × 100%

Worked example

Worked example

Using the values the calculator loads with.

Inputs

  • Data values42, 45, 39, 51, 47, 44

Result

  • Coefficient of variation9.25%
  • Mean44.6667
  • Sample SD4.1312
  • Population SD3.7712
  • Population CV8.44%
  • ReadingLow variability (under 10%)

How to use the Coefficient of Variation Calculator

  1. 1Paste your values separated by commas.
  2. 2Read the CV as a percentage of the mean.
  3. 3Compare CVs between datasets that use different units or scales.

Frequently asked questions

When is CV misleading?

When the mean is near zero or the data can be negative — the ratio explodes and loses meaning.

What is a good CV in a lab assay?

Under 10% is usually acceptable for precision, and under 5% is considered tight, but check your field's guidance.

About this calculator