5 Why Analysis Score Calculator
Score your 5 Why root cause analysis by depth and evidence strength. Determine if your investigation reaches actionable root causes.
Free Quality Calculators
24 toolsDefect rate, yield, FMEA, and cost of quality calculators. Browse our free quality tools below — no sign-up required.
COPQ Calculator (Cost of Poor Quality)
Calculate total cost of poor quality including internal and external failure costs. Quantify the financial impact of quality problems in manufacturing.
Cost of Poor Quality (COPQ) Calculator
Calculate cost of poor quality by summing internal failure and external failure costs. Identify waste reduction opportunities in manufacturing.
Customer Complaint Rate Calculator
Calculate customer complaint rate per units shipped or per million. Track quality escapes and benchmark against industry complaint rate targets.
Defect Rate Calculator
Calculate manufacturing defect rate by dividing defective units by total units produced. Track quality performance and reduce scrap costs.
Defects Per Million Opportunities (DPMO) Calculator
Calculate DPMO by dividing total defects by units times opportunities and multiplying by one million. Essential Six Sigma quality metric.
Failure Rate Calculator (Lambda)
Calculate failure rate (λ) from total operating time and number of failures. Determine reliability metrics for equipment and product analysis.
Final Yield Calculator
Calculate final yield — the ratio of good units shipped to total units started. Measure end-to-end manufacturing output including rework.
First Pass Yield (FPY) Calculator
Calculate first pass yield — the percentage of units that pass inspection without rework. Measure true process efficiency in manufacturing.
Fishbone Diagram Scoring Calculator
Score and prioritize causes from your Ishikawa fishbone diagram. Weight cause categories and rank potential root causes by total score.
FMEA RPN Calculator
Calculate Risk Priority Numbers (RPN) for Failure Mode and Effects Analysis. Prioritize failure modes by severity, occurrence, and detection ratings.
ISO Document Control Cost Calculator
Calculate annual ISO document control cost including creation, review, training, and audit hours at your hourly rate. Budget quality system overhead.
Pareto Analysis Calculator
Rank defect types by frequency and cumulative percentage for 80/20 Pareto analysis. Identify the vital few quality issues driving most defects.
PPM Calculator (Parts Per Million)
Calculate parts per million defect rate for manufacturing quality. Convert defect counts to PPM to benchmark supplier and process performance.
Reliability MTBF Calculator
Calculate Mean Time Between Failures by dividing total operating hours by number of failures. Essential reliability and maintenance metric.
Reliability MTTR Calculator
Calculate Mean Time To Repair by dividing total repair hours by number of repairs. Track maintenance efficiency and improve equipment uptime.
Return Rate Calculator
Calculate product return rate as a percentage of units shipped. Track customer returns to identify quality issues and reduce reverse logistics.
Rolled Throughput Yield (RTY) Calculator
Calculate rolled throughput yield by multiplying first pass yields across process steps. Measure total process quality for multi-step manufacturing.
Scrap Rate Calculator
Calculate manufacturing scrap rate as a percentage of total production. Monitor material waste, reduce cost, and improve process efficiency.
SPC Implementation Cost Calculator
Estimate the total cost of implementing Statistical Process Control including training, software, gages, and labor. Calculate ROI from reduced scrap.
Supplier Quality Rating Calculator
Calculate weighted supplier quality score from PPM, on-time delivery, corrective actions, and audit results. Rank and compare supplier performance.
Warranty Claim Rate Calculator
Calculate warranty claim rate per units in warranty population. Estimate warranty costs and project financial liability from field failure data.
Weibull Analysis Calculator
Calculate Weibull reliability with shape (β) and scale (η) parameters. Determine failure probability, reliability, and hazard rate at any time.
Weibull Reliability Calculator
Calculate Weibull reliability R(t) using shape and scale parameters. Predict product survival probability at any time for maintenance planning.