DPMO & Sigma Level Calculator
Turn a defect count into defects per million opportunities, an approximate Six Sigma level, and throughput yield. Your numbers stay in your browser.
Defects per million opportunities (DPMO)
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How this is calculated
DPMO normalizes defects by both the number of units and the number of ways each unit can go wrong, so processes of different complexity can be compared on one scale.
DPMO = DPO × 1,000,000
Throughput yield = (1 − DPO) × 100
The sigma level is estimated from DPMO using the widely used Six Sigma approximation, which already bakes in the conventional 1.5 sigma long-term shift:
Reading the result
- An opportunity is a chance to create one defect. Count the distinct, independent ways a single unit can fail inspection. Inflating opportunities flatters your DPMO, so define them honestly and keep the definition stable over time.
- Total defects, not defective units. One unit can carry several defects. Enter the full defect count, otherwise DPMO understates the true rate.
- The 1.5 sigma shift is a convention. Six Sigma reports the long-term sigma level, which subtracts 1.5 sigma from the short-term value to account for process drift. A result near 6.0 corresponds to roughly 3.4 DPMO. Very low DPMO is shown as ≥ 6.0 because the approximation flattens out at the top.
- This is a snapshot. A single sample is not a stable process. Trend DPMO over time before you act on the sigma level.
Defect rates and yield are downstream of how quickly problems are seen on the floor. To connect quality to throughput, see the OEE calculator and the OEE calculation guide, or size the cost of defects that reach customers with the quality escape cost calculator.
Catch defects while they are still cheap
Harmony connects your machines, inspections, and paperwork into one real-time operational layer, no rip-and-replace, so defect signals surface as they happen instead of at the end of the line. Read the CLS case study.
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