Free Defect Rate Calculator
Calculate defect rate to measure the percentage of units produced that fail to meet quality standards.
Defect Rate
0.500%
Defect Rate vs Defective Units
How to Calculate Defect Rate
Formula
Defect Rate = (Defective Units / Total Units Produced) x 100 DPMO = (Defective Units / Total Units) x 1,000,000
Defect rate directly measures quality. Lower is better. Manufacturing excellence programs like Six Sigma aim for 3.4 DPMO (defects per million opportunities), which equates to a defect rate of 0.00034%. Even in less rigorous environments, tracking defect rates identifies process problems and drives continuous improvement.
Example Calculation
A production run of 5,000 units yields 25 defective pieces.
- 01Defect Rate = (25 / 5,000) x 100 = 0.5%
- 02Yield Rate = (4,975 / 5,000) x 100 = 99.5%
- 03DPMO = (25 / 5,000) x 1,000,000 = 5,000
Frequently Asked Questions
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