Skip to content
ENExplore Calculators

Defect Rate (DPMO) Calculator

Work out defect rate (dpmo) instantly with clear inputs, formula shown and shareable results.

About Defect Rate (DPMO) Calculator

DPMO normalises defect counts by complexity. Counting opportunities per unit — solder joints, dimensions, data fields — lets you compare a simple bracket with a complex assembly on the same scale, which is why Six Sigma programmes standardise on it.

Formulas

Defects per opportunity

DPO = Defects / (Units x Opportunities per unit)

DPMO

DPMO = DPO x 1,000,000

Worked example

With the default values below, Defect Rate (DPMO) Calculator returns Defects per million opportunities of 2,250. Change any input above and every figure here is recalculated in your browser.

Inputs used

Units inspected
1,500
Defects found
27
Defect opportunities per unit
8

Results

Defects per million opportunities
2,250
Defects per unit
0.0180
Defect rate per opportunity
0.2250%
Opportunity-level yield
99.7750%

Step by step

  1. 1Values used
  2. 2Defects per opportunity
  3. 3DPMO
  4. 4Defects per million opportunities= 2,250
  5. 5Defects per unit= 0.0180
  6. 6Defect rate per opportunity= 0.2250
  7. 7Opportunity-level yield= 99.7750

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How do I count opportunities?

Count the independent ways a unit can fail inspection, and then keep the definition fixed. Inflating opportunities is the easiest way to fake an improvement.

Is DPMO the same as PPM defective?

No. PPM counts defective units; DPMO counts defects against opportunities, so a unit with three defects contributes three.

Related Calculators

Defect Rate (DPMO) Calculator | Calcrivo