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Defect Rate Calculator

Free Defect Rate Calculator with instant browser-based results and a clear calculation breakdown.

Defect Rate Calculator

Calculate the defect rate (defects per unit or DPMO) for quality control. Enter the number of defects found and the total units inspected to determine your defect rate percentage and metrics.

Number of Defects Found:

Please enter a valid number of defects (0 or greater)

Total Units Inspected:

Please enter a valid number of units (1 or greater)

Defect Opportunities per Unit (optional):

Please enter a valid number (1 or greater)

0.50%

Defect Rate

Defects Per Unit (DPU)

0.005

Defects Per Million Opportunities (DPMO)

5,000

Yield Rate

99.50%

First Pass Yield (FPY)

99.50%

Formula Explanation: Defect Rate (%) = (Number of Defects ÷ Total Units) × 100 DPU = Total Defects ÷ Total Units DPMO = (Total Defects ÷ (Total Units × Opportunities)) × 1,000,000 Yield Rate = 100% - Defect Rate The defect rate measures the proportion of defective items in a production batch. Lower defect rates indicate better quality control. DPMO is commonly used in Six Sigma methodologies to measure process performance.

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See examples, formula notes and limitations.

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