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Proportion Defective is the fraction of units that contain defects.

Proportion Defective is a percentage value. It is calculated by dividing the number of defective unites by the total number of units, and then multiplying by 100 to get a percentage.

For a better understanding of Proportion Defective and an overview of Lean Six Sigma, check out our Free Lean Six Sigma Yellow Belt Training, Green Belt Training or Lean Training.

Elisabeth Swan

Elisabeth is a Managing Partner & Executive Advisor at For over 25 years, she's helped leading organizations like Amazon, Charles Schwab and Starwood Hotels & Resorts build problem-solving muscles with Lean Six Sigma to achieve their goals.