Quality Control Cost Calculator

Quality Cost of Quality (COQ) = Prevention (training, process design, supplier qualification) + Appraisal (inspection, testing, calibration) + Internal Failure (scrap, rework, downtime) + External Failure (returns, warranty, reputation damage, penalties). Industry benchmark: COQ should be 3–5% of revenue. Above 10% indicates systemic quality problems.

For every ₹1 spent on prevention, companies typically save ₹8–10 in failure costs. Investing ₹1 lakh in quality training and process improvement saves ₹5–8 lakhs in rework, rejection, and customer returns annually. Quality improvement investment has among the highest ROI of any operational improvement — yet it is consistently underfunded in Indian SMBs.

Six Sigma targets 3.4 defects per million opportunities. Full Six Sigma implementation with Black Belt certification requires significant investment. However, the DMAIC methodology (Define, Measure, Analyse, Improve, Control) and basic Statistical Process Control (SPC) using control charts are highly valuable for any manufacturing SMB and can be implemented at low cost.

Basic QC system: incoming material inspection (acceptance sampling using AQL tables), in-process checks at critical operations (control charts for key dimensions), final inspection before dispatch, customer complaint tracking, and monthly quality review meeting. Cost: ₹50,000–2,00,000 to implement. Immediate ROI typically covers implementation cost within 3 months.

AQL is the maximum percentage of defective items considered acceptable in a batch for sampling inspection. Common AQL levels: 0.65% for critical components, 1.0% for major characteristics, 2.5% for minor characteristics. Use AQL tables (IS 2500) to determine sample size and acceptance/rejection numbers. Higher AQL means accepting more defects — use lower AQL for higher-risk items.