Cost of Quality Calculator
Cost of quality groups prevention and appraisal spending with costs caused by internal and external failures. It can highlight whether failure costs dominate a quality program.
How to use this calculator
- Enter costs for each category from the same reporting period.
- Check that all inputs use the same units, period and population scope.
- Change one assumption at a time when comparing scenarios.
Formula used by defect cost of quality calculator
Total cost of quality = prevention + appraisal + internal failure + external failure.
- Total cost of quality = prevention + appraisal + internal failure + external failure.
- Classify each cost once and keep the time period consistent. Some organizations classify or allocate quality costs differently.
- The tool validates inputs and rounds displayed figures for readability; it does not validate assumptions against external records.
Worked examples
Worked example
Prevention 1,200, appraisal 850, internal failure 2,100 and external failure 900.
Total = 1,200 + 850 + 2,100 + 900 = 5,050.
Total cost of quality is 5,050.
Understanding the result
Cost of quality groups prevention and appraisal spending with costs caused by internal and external failures. It can highlight whether failure costs dominate a quality program.
Classify each cost once and keep the time period consistent. Some organizations classify or allocate quality costs differently.
Important notes
Classify each cost once and keep the time period consistent. Some organizations classify or allocate quality costs differently.
Treat the result as an estimate from the entered assumptions. For commercial, statistical, engineering or health-related decisions, verify relevant specifications and professional guidance.
Frequently asked questions
Are prevention costs always waste?
No. Prevention investment may reduce more expensive failures, which should be assessed over time.
Does the calculator prove quality improvement?
No. It calculates a cost breakdown; process and outcome data are needed to evaluate changes.
How should I interpret this result?
Classify each cost once and keep the time period consistent. Some organizations classify or allocate quality costs differently.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.