How do you calculate the cost of a thermoformed part?

Multiply the batch quantity by variable cost per part by the truly-variable share, add fixed setup and tooling, then divide by the batch. At 100 parts, $45 each, 80% variable and $250 fixed you get $3,850 total, or $38.50 per part.

What does the variable share percentage do?

It scales how much of the per-part cost genuinely flexes with volume. At 80%, $3,600 of the $4,500 raw variable cost is treated as truly variable, and the remaining fixed $250 is added on top.

Why does batch size change formed part cost so much?

Fixed setup and tooling are spread over the batch. The $250 here adds $2.50 to each of 100 parts but only 25 cents across 1,000, which is why short runs quote higher per part.

What is a good per-part cost for a formed tray?

It depends entirely on gauge, material and complexity, so benchmark against your own quotes and the sell price. The point of the number is that $38.50 per part must sit comfortably below what the customer pays.

Formed part cost vs material cost — what is the difference?

Material cost is only the sheet; formed part cost adds forming, trim, scrap, energy and amortized setup, giving the total you actually need to recover in price.

How do I lower per-part cost on short runs?

The fastest lever is the fixed adjustment: reduce changeover time and tooling amortization per run, or consolidate orders so the $250-type setup spreads over more parts.

Thermoforming & Vacuum Formed Products calculator

Formed Part Cost Calculator

Formed Part Cost builds the fully-loaded cost of a thermoformed part by combining a variable per-part cost, the share of that cost that genuinely flexes with volume, and the fixed setup and tooling that must be amortized across the run. Estimators and program managers use it to quote formed trays, clamshells and technical parts with a number that survives audit. It matters because thermoforming economics hinge on batch size: the same part is cheap at 100,000 and expensive at 500 once setup is spread. This gives you the per-unit figure that anchors a defensible price.

What this calculator does

Formed Part Cost builds the fully-loaded cost of a thermoformed part by combining a variable per-part cost, the share of that cost that genuinely flexes with volume, and the fixed setup and tooling that must be amortized across the run.
Use it when formed part cost in thermoforming and vacuum formed products is being put through a thermoforming and vacuum formed products weighted-cost review.
It weights per-part variable cost by the truly-variable share, adds fixed setup and tooling, and divides by the batch to give cost per formed part.

Formula used

Formed Part Cost cost = quantity × rate × capture factor + fixed cost
Per-unit formed part cost = total cost ÷ quantity

Inputs explained

Formed parts in the costed batch:
Variable cost per formed part:
Share of cost that is truly variable:
Fixed setup and tooling amortization:

How to use the result

Use it when quoting a run, comparing batch sizes, or checking whether a short order still clears cost after setup.
The variable-share percentage is a modelling choice; misclassifying semi-fixed costs like changeover labor will skew the per-unit result, so validate it against actuals.

Current U.S. benchmarks

The producer price index for plastic resins and materials stands at 319.371 (BLS, May 2026), up 19.5% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 9,635 plastics product manufacturing establishments employing about 677,302 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate the cost of a thermoformed part? Multiply the batch quantity by variable cost per part by the truly-variable share, add fixed setup and tooling, then divide by the batch. At 100 parts, $45 each, 80% variable and $250 fixed you get $3,850 total, or $38.50 per part.
What does the variable share percentage do? It scales how much of the per-part cost genuinely flexes with volume. At 80%, $3,600 of the $4,500 raw variable cost is treated as truly variable, and the remaining fixed $250 is added on top.
Why does batch size change formed part cost so much? Fixed setup and tooling are spread over the batch. The $250 here adds $2.50 to each of 100 parts but only 25 cents across 1,000, which is why short runs quote higher per part.
What is a good per-part cost for a formed tray? It depends entirely on gauge, material and complexity, so benchmark against your own quotes and the sell price. The point of the number is that $38.50 per part must sit comfortably below what the customer pays.
Formed part cost vs material cost — what is the difference? Material cost is only the sheet; formed part cost adds forming, trim, scrap, energy and amortized setup, giving the total you actually need to recover in price.

Last reviewed 2026-05-12.