Calculator Inputs
This calculator uses a three-column layout on large screens, two columns on smaller screens, and one column on mobile.
Example Data Table
This sample scenario uses the built-in default values from the calculator.
| Scenario Item | Sample Value | Interpretation |
|---|---|---|
| Units Produced | 10,000 | Total output measured in the review period. |
| Defect Rate | 6.5% | Share of produced units that fail internal quality expectations. |
| Escaped Defect Rate | 1.2% | Defects that still reach the customer after inspection. |
| Extra Inspection Hours | 45 | Added effort required to contain and sort suspect output. |
| Total Cost of Poor Performance | $13,523.00 | Combined internal and external cost burden. |
| COPP as % of Sales | 3.01% | Financial drag relative to total sales value. |
Formula Used
= Internal Failure Costs + External Failure Costs
= Scrap Cost + Rework Cost + Downtime Cost + Inspection Cost + Expedite or Containment Cost
= Warranty Cost + Return Handling Cost + Complaint Cost + Penalty Cost + Lost Contribution Margin
Cost per Unit = Total COPP ÷ Units Produced
COPP % of Sales = (Total COPP ÷ Total Sales Value) × 100
First Pass Yield = 100 − Defect Rate
This structure helps quality teams separate internal process losses from customer-facing failures, which makes prioritization easier during continuous improvement reviews.
How to Use This Calculator
- Enter the total units produced and the average selling price per unit for the period you want to evaluate.
- Add the defect rate, then split those defects into scrap share and rework share.
- Enter your direct cost assumptions for scrap, rework, warranty, returns, and complaint handling.
- Include operational burden values such as extra inspection hours, labor rate, downtime, and expedite costs.
- Add penalty costs, lost sales units, and lost contribution margin to capture downstream business impact.
- Press the calculate button to show the results above the form, inspect the breakdown table, and export the summary as CSV or PDF.
FAQs
1. What does cost of poor performance mean?
It is the money lost because a process fails to deliver the expected quality level. It usually includes scrap, rework, downtime, warranty, returns, complaints, penalties, and missed margin from lost sales.
2. Why separate internal and external failure costs?
Internal failures happen before shipment, while external failures appear after customers receive the product. Separating them shows whether the main issue is factory control, containment effectiveness, or customer-facing reliability.
3. Should lost sales be included?
Yes, when poor quality reduces repeat orders, cancellations, or conversions. Using contribution margin instead of full revenue keeps the estimate more realistic because it focuses on profit impact rather than gross sales alone.
4. How accurate is the result?
The result is only as accurate as the assumptions entered. Teams usually get better accuracy by updating labor rates, return costs, downtime values, and escape rates with recent operational and customer-service data.
5. Can service businesses use this calculator?
Yes. Replace units with service transactions, defects with service failures, and warranty or return costs with credits, rework labor, escalations, or churn-related losses. The same logic still works.
6. What is escaped PPM?
Escaped PPM means escaped defects per million produced units. It helps compare customer-facing quality performance across time periods, plants, or product lines with a standardized scale.
7. Why include extra inspection hours?
Extra inspection often appears after a quality issue is discovered. Although it feels like protection, it still represents added cost caused by poor process performance, so it belongs in the total burden.
8. How can managers reduce this cost fastest?
Start with the biggest cost driver in the breakdown chart. Many teams reduce COPP fastest by cutting repeat defects, improving first pass yield, lowering escape rates, and shortening downtime from recurring root causes.