📉 Quality
Defect Rate Calculator – PPM, DPMO & Sigma Level
Calculate your process defect rate in PPM (Parts Per Million), DPMO and find your equivalent Sigma quality level.
Each unit may have multiple defects
Number of ways a single unit can fail (e.g. 5 inspection criteria = 5 opportunities)
📊 Defect Rate Results
Defect Rate (%)
—
PPM (Parts Per Million)
—
DPU (Defects Per Unit)
—
DPMO
—
Sigma Level
—
How This Calculator Works
PPM = (Defects ÷ Total Units) × 1,000,000
DPU = Total Defects ÷ Total Units
DPMO = DPU ÷ Opportunities × 1,000,000
Sigma Level Reference
| Sigma | DPMO | Yield |
|---|---|---|
| 6σ | 3.4 | 99.9997% |
| 5σ | 233 | 99.977% |
| 4σ | 6,210 | 99.38% |
| 3σ | 66,807 | 93.32% |
🔗 Related Calculators
PPM vs DPMO — When to Use Each
PPM is used when each unit either passes or fails as a whole. DPMO (used in Six Sigma) accounts for the fact that complex products have many opportunities to fail. A circuit board with 200 solder joints has 200 failure opportunities per unit — DPMO normalizes for this complexity and allows fair comparison across different processes and products.
📦 Embed this calculator on your site
Free for any blog, forum or LinkedIn post. Copy this snippet and paste it where you want the calculator to appear. Attribution to Anedya Enterprise is included automatically.
Paste anywhere — the iframe auto-detects context and renders in compact embed mode with the Powered-by Anedya Enterprise attribution.