Enter Quality Cost Inputs
Use all direct quality-related costs for the same period, such as one month, quarter, or year.
Example Data Table
| Example Metric | Sample Value |
|---|---|
| Revenue | $250,000.00 |
| Units Produced | 10,000 |
| Prevention Cost | $11,000.00 |
| Appraisal Cost | $10,500.00 |
| Internal Failure Cost | $13,700.00 |
| External Failure Cost | $12,600.00 |
| Cost of Conformance | $21,500.00 |
| Cost of Poor Quality | $26,300.00 |
| Total Cost of Quality | $47,800.00 |
| COQ % of Sales | 19.12% |
| COQ per Unit | $4.78 |
Formula Used
Prevention Cost = Training + Quality Planning + Process Control + Supplier Development + Preventive Maintenance
Appraisal Cost = Inspection + Testing + Calibration + Audits + Field Trials
Internal Failure Cost = Scrap + Rework + Downtime + Yield Loss + Retest + Failure Analysis
External Failure Cost = Warranty + Returns + Complaints + Recalls + Liability + Lost Sales
Cost of Conformance = Prevention Cost + Appraisal Cost
Cost of Poor Quality = Internal Failure Cost + External Failure Cost
Total Cost of Quality = Cost of Conformance + Cost of Poor Quality
COQ % of Sales = (Total Cost of Quality ÷ Revenue) × 100
COPQ % of Sales = (Cost of Poor Quality ÷ Revenue) × 100
COQ per Unit = Total Cost of Quality ÷ Units Produced
Gap to Target Value = Total Cost of Quality − Target COQ Value
How to Use This Calculator
- Choose one accounting period, such as monthly, quarterly, or yearly.
- Enter the sales value and total units produced for that same period.
- Fill all prevention, appraisal, internal failure, and external failure fields.
- Add a target COQ percentage if you want variance tracking.
- Click the calculate button to show results above the form.
- Review total COQ, COPQ, shares, ratios, and management insight.
- Use the export buttons to download your results as CSV or PDF.
FAQs
1. What is total cost of quality?
Total cost of quality is the complete amount spent to achieve, measure, and recover from quality performance. It includes prevention, appraisal, internal failure, and external failure costs.
2. What is the difference between conformance and nonconformance costs?
Conformance costs include prevention and appraisal spending. Nonconformance costs include internal and external failures. Strong systems usually move money from failure toward prevention and control.
3. Why is lost sales included in external failure?
Defects can reduce repeat purchases, referrals, and brand trust. Those missed revenues are indirect external failure costs and often make the real quality impact much larger.
4. What does COQ percentage of sales show?
It shows how much of revenue is consumed by quality-related spending. Lower values often indicate better cost efficiency, especially when failure costs are falling over time.
5. Is a higher prevention cost always bad?
No. Higher prevention cost can be beneficial if it reduces scrap, rework, claims, and returns. The goal is not minimum prevention spending, but lower total quality cost.
6. How often should I calculate total cost of quality?
Most teams calculate it monthly or quarterly. Frequent tracking makes trends visible and helps management see whether process improvement projects are actually reducing poor quality costs.
7. Can service businesses use this calculator?
Yes. Replace production-related items with service equivalents such as training, audits, complaint handling, rework hours, service credits, and customer churn estimates.
8. What should I do if failure costs dominate the results?
Investigate root causes, tighten process controls, improve supplier quality, strengthen training, and review customer feedback. The main aim is shifting recurring losses into preventive action.