About the Defect Rate Calculator (DPMO)
Defect rate, defects per million opportunities (DPMO) and the approximate Six Sigma level.
Also known as: dpmo calculator, six sigma level, defects per million, ppm defects.
How to use this calculator
- Enter defects found, units inspected, opportunities per unit.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
DPMO = defects ÷ (units × opportunities) × 1,000,000
Worked example
Using the values pre-filled in the calculator above:
- Defects found = 23
- Units inspected = 1,200
- Opportunities per unit = 1
the calculator returns:
- Defect rate: 1.92%
- DPMO: 19,167
- Sigma level: 3.57 σ
- Yield: 98.0833%