Can I use rejected sample units over total received units?

No, the counts would describe different populations. Use the actual inspected population for a sample statistic and apply the approved sampling plan separately.

Do several defects on one received unit count separately?

No, the numerator counts rejected physical units. Maintain a separate event log when multiple nonconformities need analysis.

Is the agreed limit an acceptance quality limit?

Not necessarily. This input is a maximum observed rejected-unit percentage; a formal acceptance sampling plan has additional sample-size and acceptance-number rules.

What if some received units remain on hold?

Finish their disposition before using this complete-cohort model. Treating unresolved units as accepted understates the rejected share.

Quality & Metrology calculator

Supplier Defect Rate Calculator

Check a received lot after every unit has a disposition. Use distinct rejected units, the fully inspected received count and the supplier’s agreed maximum rejection percentage.

What this calculator does

Compare rejected units with a fully inspected received lot and its agreed maximum defect rate.

Formula used

Supplier defect rate = rejected received units ÷ fully inspected received units × 100
Rejected units per million = rejected received units ÷ received units × 1,000,000
Accepted received units = received units − rejected units
Rate margin = agreed maximum defect rate − supplier defect rate

Inputs explained

Rejected Received Units: Distinct rejected units from the fully inspected received cohort.
Fully Inspected Received Units: Received cohort units with completed inspection and disposition.
Agreed Maximum Defect Rate: Maximum rejected-unit percentage agreed for this receiving scope.

How to use the result

Best suited to fully sorted receiving Lot, supplier quality review.
A sampled inspection result cannot be divided by the entire shipment count. This observed rate does not implement an acceptance sampling plan.

Current U.S. benchmarks

U.S. manufacturing runs at 75.7% of capacity (Federal Reserve, Aug 2026). New factory orders are up 8.5% year over year (Census).

Common questions

Can I use rejected sample units over total received units? No, the counts would describe different populations. Use the actual inspected population for a sample statistic and apply the approved sampling plan separately.
Do several defects on one received unit count separately? No, the numerator counts rejected physical units. Maintain a separate event log when multiple nonconformities need analysis.
Is the agreed limit an acceptance quality limit? Not necessarily. This input is a maximum observed rejected-unit percentage; a formal acceptance sampling plan has additional sample-size and acceptance-number rules.
What if some received units remain on hold? Finish their disposition before using this complete-cohort model. Treating unresolved units as accepted understates the rejected share.

Last reviewed 2026-10-06.