How do you calculate supplier lot acceptance rate?

Divide accepted lots by lots received, then multiply by 100. With 86 accepted out of 94 received, that is 86 ÷ 94 × 100 = 91.49% lot acceptance.

What is a good supplier lot acceptance rate in aerospace?

Approved aerospace suppliers are typically held to 95% or higher, with critical-part and flight-safety suppliers expected to be at or near 98-99%. At 91.49% against a 98% target, this supplier is 6.51 points short and would normally trigger an SCAR.

What does the acceptance gap to target mean?

It is your actual rate minus the contractual target. Here 91.49% minus 98% gives a 6.51 percentage-point shortfall, quantifying exactly how much improvement is needed to satisfy the contract.

Lot acceptance rate vs PPM — which should I track?

Lot acceptance rate measures how often whole lots pass and drives inspection and disposition decisions; PPM (defective parts per million) measures escaped-piece quality. Aerospace scorecards usually track both because a supplier can pass most lots yet still ship out-of-tolerance pieces.

Why use lot acceptance rate instead of piece-level yield?

Receiving inspection accepts or rejects by lot, so lot-level data matches the actual gate you control. It directly informs whether to tighten sampling, demand source inspection, or move the supplier to skip-lot.

How can a supplier improve a low lot acceptance rate?

Common levers are a formal corrective action (8D), a more robust First Article (AS9102), in-process SPC at the supplier, and pre-shipment functional checks so out-of-tolerance lots never leave the supplier's dock.

Aerospace & Defense Manufacturing calculator

Supplier Lot Acceptance Rate Calculator

Supplier lot acceptance rate is the percentage of incoming supplier lots that clear receiving inspection without rejection. In aerospace and defense supply chains it is a core supplier scorecard metric tied to AS9100 supplier performance monitoring and First Article requirements. Quality engineers and supplier development teams use it to decide who stays on the approved vendor list, who needs corrective action, and where to tighten or loosen incoming inspection sampling. A rate that drifts below target is an early warning of supplier process drift long before it shows up as a line stoppage or an escape to a build.

What this calculator does

Calculate supplier lot acceptance from accepted lots, received lots, and the required supplier quality target.
a supplier quality manager needs to compare accepted incoming lots against the supplier performance target
It computes the percentage of received supplier lots that were accepted at receiving inspection and how far that sits from your contractual acceptance target.

Formula used

Supplier lot acceptance rate = accepted supplier lots ÷ supplier lots received × 100
Acceptance gap to target = supplier lot acceptance rate - supplier acceptance target

Inputs explained

Supplier lots accepted at receiving inspection:
Supplier lots received for inspection:
Contractual supplier acceptance target:

How to use the result

Use it during quarterly supplier reviews, source reduction decisions, and when deciding whether to move a supplier to skip-lot or tightened inspection.
Lot count alone ignores lot size and defect severity — one rejected 5,000-piece lot of flight-critical fasteners is not equivalent to one rejected 12-piece lot of brackets.

Current U.S. benchmarks

Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).
The U.S. has 11,691 transportation equipment establishments employing about 1,682,910 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate supplier lot acceptance rate? Divide accepted lots by lots received, then multiply by 100. With 86 accepted out of 94 received, that is 86 ÷ 94 × 100 = 91.49% lot acceptance.
What is a good supplier lot acceptance rate in aerospace? Approved aerospace suppliers are typically held to 95% or higher, with critical-part and flight-safety suppliers expected to be at or near 98-99%. At 91.49% against a 98% target, this supplier is 6.51 points short and would normally trigger an SCAR.
What does the acceptance gap to target mean? It is your actual rate minus the contractual target. Here 91.49% minus 98% gives a 6.51 percentage-point shortfall, quantifying exactly how much improvement is needed to satisfy the contract.
Lot acceptance rate vs PPM — which should I track? Lot acceptance rate measures how often whole lots pass and drives inspection and disposition decisions; PPM (defective parts per million) measures escaped-piece quality. Aerospace scorecards usually track both because a supplier can pass most lots yet still ship out-of-tolerance pieces.
Why use lot acceptance rate instead of piece-level yield? Receiving inspection accepts or rejects by lot, so lot-level data matches the actual gate you control. It directly informs whether to tighten sampling, demand source inspection, or move the supplier to skip-lot.

Last reviewed 2026-05-12.