CalculationInspection costs
Free inspection cost calculator
Calculates inspection time and costs from sample size, preparation and documentation.
How to use the result
Defaults are a worked example. Use your own measured times and cost rates.
This calculator does not define a sampling plan or estimate acceptance probabilities. Use the inspection scope agreed in your drawing, inspection plan and customer requirements.
Include first-article inspection either in one-off preparation or in the inspected quantity. Do not count inspection already included in machining time twice.
Formulas
T = preparation + documentation + inspected quantity × time per inspected partbatch cost = T / 60 × hourly rate + additional costcost per part = batch cost / batch quantity Sources: ASQ: Cost of Quality, appraisal costs. https://asq.org/quality-resources/cost-of-quality; Datar/Rajan: Horngren’s Cost Accounting, cost behaviour and quality costs; time valued at your own cost rates.