免费不良品率计算器
计算生产过程中的不良品率，监控产品质量并推动持续改进。
Defect Rate
0.500%
Defect Rate vs Defective Units
公式
## 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.
计算示例
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
常见问题
What defect rate is acceptable?
It depends on the industry. Automotive and aerospace target under 0.01%. Consumer electronics aim for under 0.5%. Food manufacturing targets near zero for safety reasons. Even within an industry, tolerance varies by criticality of the defect.
How do I reduce defect rates?
Implement statistical process control, conduct root cause analysis on defects, train operators, standardize procedures, use mistake-proofing (poka-yoke) devices, and invest in quality inspection at critical process steps.
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