How does cost of quality differ from poor quality?

This total includes prevention and routine appraisal as well as failure costs. The failure subtotal is the recorded cost of poor quality.

Where should repeat inspection be recorded?

When a failure causes the repeat work, classify it with the related internal or external failure expense instead of routine appraisal.

Should warranty reserves and payments both be entered?

No. Follow your accounting policy so the same expense is recognized once rather than counted at provision and settlement.

Can this prove a prevention investment will pay back?

No. It summarizes entered costs; an investment decision needs independently supported future changes in costs and benefits.

What is a good cost of quality?

Typical Cost of quality runs 10-20% (% of revenue); 5-10% is good, and under 5% is world-class. Total of prevention, appraisal, and internal/external failure costs. Most shops undercount it; a rising prevention share with falling failure share is the healthy signature.

Quality & Metrology calculator

Cost of Quality Calculator

Summarize the full recorded quality cost for one period. Enter nonoverlapping prevention, routine appraisal, internal failure and external failure charges.

What this calculator does

Combine four quality cost categories while distinguishing planned prevention and appraisal from recorded failures.

Formula used

Prevention and appraisal cost = prevention cost + appraisal cost
Total failure cost = internal failure cost + external failure cost
Total cost of quality = prevention and appraisal cost + total failure cost

Inputs explained

Prevention Cost: Recorded quality planning and prevention charges for this period.
Appraisal Cost: Routine inspection, testing and audit charges for this period.
Internal Failure Cost: Failure charges identified before delivery, excluding routine appraisal.
External Failure Cost: Failure charges identified after delivery, counted once.

How to use the result

Best suited to quality cost reporting, prevention budget review.
Unrecorded reputational effects and future losses are excluded. This summary does not calculate an optimal prevention budget.

Current U.S. benchmarks

U.S. manufacturing runs at 75.7% of capacity (Federal Reserve, Aug 2026). New factory orders are up 8.5% year over year (Census).

Common questions

How does cost of quality differ from poor quality? This total includes prevention and routine appraisal as well as failure costs. The failure subtotal is the recorded cost of poor quality.
Where should repeat inspection be recorded? When a failure causes the repeat work, classify it with the related internal or external failure expense instead of routine appraisal.
Should warranty reserves and payments both be entered? No. Follow your accounting policy so the same expense is recognized once rather than counted at provision and settlement.
Can this prove a prevention investment will pay back? No. It summarizes entered costs; an investment decision needs independently supported future changes in costs and benefits.
What is a good cost of quality? Typical Cost of quality runs 10-20% (% of revenue); 5-10% is good, and under 5% is world-class. Total of prevention, appraisal, and internal/external failure costs. Most shops undercount it; a rising prevention share with falling failure share is the healthy signature.

Related guides

Last reviewed 2026-10-06.