How do you calculate lot size economic impact?

Multiply the per-unit cost impact by the lot size for the gross figure, then multiply by usable yield and by the share captured in price. With $3.25/unit over 1,800 units at 97% yield and 100% capture, the realized impact is $3.25 × 1,800 × 0.97 × 1.00 = $5,674.50.

Why does yield reduce the lot-size impact?

Because only good parts carry value. At 97% usable yield on an 1,800-unit lot, roughly 54 parts are lost, which trims $175.50 off the $5,850 gross impact even before pricing decisions.

What does 'cost impact captured in price' mean?

It is the fraction of the economic benefit you actually fold into the customer's price versus keeping as margin or giving away. At 100% capture the full $5,674.50 flows through; at 70% you would only realize about $3,972.

Is a bigger lot always more economical?

Not automatically. A bigger lot multiplies the per-unit impact, but if yield drops on long runs or you cannot capture the savings in price, the realized benefit shrinks. Run both lot sizes through the calculator before committing.

What is the difference between gross and captured impact?

Gross impact is per-unit times lot size with no discounts — here $5,850. Captured impact applies yield and price-capture, landing at $5,674.50. The $175.50 gap is the value lost to scrap in this example.

How do I use this when quoting a volume discount?

Set the per-unit impact to your cost reduction at the larger lot, then set the capture percentage to how much of that you intend to pass on. The captured figure tells you the discount's real cost to your margin.

Contract Manufacturing, Job Shop Quoting & Make-to-Order calculator

Lot Size Economics Calculator

Lot Size Economics quantifies how much money a given lot size moves — for better or worse — once you account for yield loss and how much of that impact actually lands in your quoted price. Cost estimators and operations managers in contract shops use it to see whether running a bigger or smaller lot is genuinely worth the dollars, rather than relying on gut feel about 'economies of scale.' It matters because lot-size decisions silently shift thousands of dollars per order, and a per-unit advantage of a few cents looks trivial until you multiply it across 1,800 parts. This calculator takes a per-unit impact, scales it by lot size, then discounts it for scrap and for the share you can actually capture in price.

What this calculator does

Estimate lot-size economic benefit or cost impact for a quoted run.
comparing small lots, economic lots, blanket releases, and production batch sizes
It multiplies a per-unit lot-size cost impact by the quoted lot size to get gross dollar impact, then applies usable yield and the share captured in price to get the realized economic impact.

Formula used

gross lot-size economic impact = lot-size cost impact per unit × quoted lot size
lot-size economic impact captured = gross lot-size economic impact × usable lot yield × cost impact captured in price

Inputs explained

Lot-size cost impact per unit:
Quoted lot size:
Usable lot yield:
Cost impact captured in price:

How to use the result

Use it when comparing lot-size options on a quote, or when deciding whether a volume break or a tooling-driven cost reduction is worth offering the customer.
It assumes the per-unit impact is constant across the lot; in reality unit cost often steps down nonlinearly with quantity, so for large lot-size swings you should re-derive the per-unit figure at each quantity.

Current U.S. benchmarks

The U.S. prime lending rate is 6.75% (Federal Reserve via FRED, 2026-07-02). Payback and financing math should start from today's rate, not a remembered one.

Common questions

How do you calculate lot size economic impact? Multiply the per-unit cost impact by the lot size for the gross figure, then multiply by usable yield and by the share captured in price. With $3.25/unit over 1,800 units at 97% yield and 100% capture, the realized impact is $3.25 × 1,800 × 0.97 × 1.00 = $5,674.50.
Why does yield reduce the lot-size impact? Because only good parts carry value. At 97% usable yield on an 1,800-unit lot, roughly 54 parts are lost, which trims $175.50 off the $5,850 gross impact even before pricing decisions.
What does 'cost impact captured in price' mean? It is the fraction of the economic benefit you actually fold into the customer's price versus keeping as margin or giving away. At 100% capture the full $5,674.50 flows through; at 70% you would only realize about $3,972.
Is a bigger lot always more economical? Not automatically. A bigger lot multiplies the per-unit impact, but if yield drops on long runs or you cannot capture the savings in price, the realized benefit shrinks. Run both lot sizes through the calculator before committing.
What is the difference between gross and captured impact? Gross impact is per-unit times lot size with no discounts — here $5,850. Captured impact applies yield and price-capture, landing at $5,674.50. The $175.50 gap is the value lost to scrap in this example.

Last reviewed 2026-05-12.