Find a calculator ↗Incoming Inspection Rejection Rate Calculator
Calculate the share of inspected units rejected at incoming inspection. Report accepted units and rejected units per 1,000 inspected.
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What is this incoming inspection rejection rate calculator?
This calculator measures rejected units as a share of the units actually inspected. It is a simple incoming-quality reporting tool for a defined receipt group. One rejected unit counts once even when it has several observed defects.
How to use the calculator
Use inspected-unit and rejected-unit counts from the same inspection group. Apply a consistent rejection rule and count unique units. If only a sample was inspected, enter the sample size rather than the entire shipment quantity.
Check the input assumptions
Review the help text beneath each field before calculating. Enter amounts in US dollars where shown and use consistent units. Change one assumption at a time to understand which inputs affect your result.
Formula and worked example
Example calculation
Sixty rejected units among 4,000 inspected units give a 1.5% rejection rate. The other 3,940 units represent 98.5% of the inspected group. That is 15 rejected units per 1,000 inspected.
These numbers illustrate the calculation; they are not recommended rates or industry benchmarks.
How to interpret your result
Compare like-for-like inspection rules, product types, and sampling approaches. Review defect severity separately because a cosmetic issue and a functional failure receive the same unit weight in this ratio.
What the estimate leaves out
A sample result does not automatically represent the full shipment. The calculator does not select a sampling plan, estimate statistical confidence, or determine whether a batch should be accepted.
Frequently asked questions
Do I enter total defects or rejected units?
Enter rejected units. If one unit has three defects, it still contributes one rejected unit.
What if only 100 of 5,000 units were inspected?
Use 100 as the inspected count and the rejected count from those same 100 units.
Does zero rejection prove the shipment is perfect?
No. It means no inspected units were rejected under the rules used. Uninspected units and missed defects remain outside this measure.
Should reworked units be counted as accepted?
Record the status at the reporting stage you chose. Track initial rejection and post-rework acceptance separately to avoid hiding first-pass problems.
Can this tell me whether to reject an entire lot?
No. Lot decisions depend on your agreed quality requirements and inspection plan, which are outside this simple ratio.
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