Lean Six Sigma Calculators
One workspace. Seven phases. Evidence for every improvement decision.
Cost of Poor Quality (COPQ)
Browser-only calculations · No input data saved
Worked example results
- COPQ
- 32,000
- COPQ / revenue (%)
- 16
- Total cost of quality
- 37,000
Rounded for display only. Export includes the inputs, results, method and assumptions. Refreshing or leaving the tool clears entered data.
Original advanced tool & legacy export options
The original migrated on-site tool is retained below so existing features, industry samples and legacy exports remain available. It is a local page, not another Base44 app. Its older scoring conventions may differ from the transparent native helper above.
How to use Cost of Poor Quality (COPQ)
- Load the worked example to see the required input format.
- Size internal and external failure costs and compare them with revenue. Use consistent units, periods and definitions.
- Select Calculate, review the assumptions and export the result for your project evidence.
Formula and method
COPQ = scrap + rework + warranty + returns + lost contribution. Total quality cost = COPQ + appraisal + prevention.
Interpretation and assumptions
Use mutually exclusive costs from the same period. This tool treats appraisal and prevention as cost of quality, not failure COPQ. Lost contribution is an estimate and must not double count rework or warranty.
Results support professional judgement. They are not a certification of process stability, a financial commitment or a substitute for study design.
Frequently asked questions
How do I use the cost of poor quality (copq)?
Size internal and external failure costs and compare them with revenue. Load the example first, then replace all inputs with consistent process data and select Calculate. COPQ = scrap + rework + warranty + returns + lost contribution. Total quality cost = COPQ + appraisal + prevention.
What assumptions matter for cost of poor quality (copq)?
Use mutually exclusive costs from the same period. This tool treats appraisal and prevention as cost of quality, not failure COPQ. Lost contribution is an estimate and must not double count rework or warranty.
Are my calculator inputs saved or sent to a server?
These native calculations run in this browser tab. Inputs are not sent to a server or saved by this calculator. Download the result if you need a record; leaving or refreshing clears the form.