# Cost of Quality Calculator

> Total prevention, appraisal, internal and external failure costs.

Page: https://freecalculator.tech/tools/cost-of-quality-calculator
Last reviewed: 2026-09-16

## Formula

CoQ = (Prevention + Appraisal) + (Internal failure + External failure)

- CoQ = (Prevention + Appraisal) + (Internal failure + External failure).
- Inputs used: Currency, Prevention costs (optional), Appraisal costs (optional), Internal failure costs (optional), External failure costs (optional), Revenue for the same period (optional).
- Edge handling: Prevention costs (optional) is required.; Prevention costs (optional) cannot be negative.; Prevention costs (optional) must be no more than 1000000000000.; Appraisal costs (optional) is required.; Appraisal costs (optional) cannot be negative..

## Inputs

- Currency
- Prevention costs (optional)
- Appraisal costs (optional)
- Internal failure costs (optional)
- External failure costs (optional)
- Revenue for the same period (optional)

## Worked example: Four categories recorded for one quarter

Conformance and non-conformance are totalled separately.
1. Start with Currency: USD, Prevention costs (optional): 42000, Appraisal costs (optional): 68000, Internal failure costs (optional): 115000, External failure costs (optional): 84000, Revenue for the same period (optional): 6200000.
2. Apply the method: CoQ = (Prevention + Appraisal) + (Internal failure + External failure).
3. Conformance and non-conformance are totalled separately.

## Common questions

### Where does this formula come from?

ASQ cost of quality: quality costs are grouped as prevention, appraisal, internal failure and external failure. See the source link on this page.

### What kind of calculation is this?

The prevention-appraisal-failure model: conformance costs plus non-conformance costs, each category reported separately. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### What are its limits?

Only the costs entered are included; costs not recorded by the organisation are absent from the total. Category boundaries vary between organisations, which limits comparison with anyone else's figures. A measured cost of quality, an industry benchmark and an organisation's target are three different things.

### How do I use the Cost of Quality Calculator?

Enter the required values for Currency, Prevention costs (optional), Appraisal costs (optional), Internal failure costs (optional), External failure costs (optional), and the other fields shown. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the Cost of Quality Calculator use?

CoQ = (Prevention + Appraisal) + (Internal failure + External failure) The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### Can the Cost of Quality Calculator be used for exact decisions?

Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.

## Limitations and assumptions

- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this cost of quality calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- American Society for Quality — https://asq.org/quality-resources/cost-of-quality

## Cite this page

- APA: Free Calculator. (2026, September 16). Cost of Quality Calculator. https://freecalculator.tech/tools/cost-of-quality-calculator
- MLA: "Cost of Quality Calculator." Free Calculator, 16 Sept. 2026, https://freecalculator.tech/tools/cost-of-quality-calculator.
- Link: Cost of Quality Calculator — Free Calculator, https://freecalculator.tech/tools/cost-of-quality-calculator