🏭 Quality Control & Six Sigma

Defect Rate Calculator

Calculate defective rate, good rate and defects per million from inspected and defective units.

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Result

Enter values and calculate.
Results are estimates based on the values entered. Verify measurement definitions and sampling assumptions before operational decisions.

How to use this calculator

What to enter

Enter or select the following as requested: Total units inspected; Defective units. Follow the units, valid ranges, examples, and options displayed beside each field.

What the result means

The production or reliability metric is calculated from the operating time, output, defects, failures, or capacity values entered. Check the time basis, planned versus unplanned downtime, and whether the metric follows the definitions used by your operation.

When to use it

Use this to compare production performance, equipment reliability, quality, or capacity over consistent periods. Validate definitions against plant records before using the result for operational targets.