Cost Of Quality Ratio Calculator

Work out cost of quality ratio instantly with clear inputs, formula shown and shareable results.

About Cost Of Quality Ratio Calculator

The prevention-appraisal-failure model splits quality spend into money spent avoiding defects, money spent finding them and money lost because of them. A failure-to-good-quality ratio above 1 means the organisation is paying more for failures than for prevention and inspection combined — the classic signal to invest upstream.

Formulas

Cost of quality

COQ = prevention + appraisal + failure cost

Balance ratio

Failure to good-quality ratio = failure cost / (prevention + appraisal)

Worked example

With the default values below, Cost Of Quality Ratio Calculator returns Total Cost Of Quality of $6,200,000.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Prevention Costminimum 0: 600,000
Appraisal And Inspection Costminimum 0: 1,400,000
Internal Plus External Failure Costminimum 0: 4,200,000
Annual Revenueminimum 0.01: 180,000,000

Results

Total Cost Of Quality: $6,200,000.00
COQ As % Of Revenue: 3.444%
Failure To Good-Quality Spend Ratio: 2.100
Prevention Share Of Spend: 9.68%

Step by step

1Values used
2Cost of quality
3Balance ratio
4Total Cost Of Quality= 6,200,000.00
5COQ As % Of Revenue= 3.444
6Failure To Good-Quality Spend Ratio= 2.100
7Prevention Share Of Spend= 9.68

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation or tax into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

What is a healthy split?

Mature operations shift towards prevention: roughly 25-30% prevention, 30-35% appraisal and under 40% failure. Struggling operations show 5% prevention and 70% failure.

Can appraisal spend be reduced?

Yes, once processes are capable. Moving from 100% inspection to statistical process control and then to process capability evidence is the normal route, but only after capability is demonstrated.