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How to calculate Defect rate

The Defect rate formula, with plain worked examples you can check yourself.

Defect rate = D ÷ U × 100

The result is a percentage (%).

Worked examples

D = 9 · U = 300Defect rate = 3%
D = 9 · U = 300Defect rate = 3%
D = 8 · U = 200Defect rate = 4%

How to use it

  1. Write down the values for each letter in the formula.
  2. Do the brackets first, then divide or multiply.
  3. Multiply by 100 to show the answer as a percentage.
  4. Compare the answer with last period or with a competitor to see if it is good or bad.

This formula belongs to Quality & Efficiency.

Related terms

Defect rateQuality controlBottleneckAutomationBenchmarkingSix Sigma

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