How do you calculate bag converting cost?

Multiply run quantity by variable cost per thousand, then add setup and overhead. For 250M bags at $12.50/M plus $350 setup and $175 overhead: 250 x 12.50 + 350 + 175 = $3,650 total.

What is the cost per thousand bags?

Divide total run cost by run quantity in thousands. Here $3,650 / 250 = $14.60 per thousand bags, which is $2.10 above the bare variable rate of $12.50 because setup and overhead are spread across the run.

Why does cost per thousand drop on longer runs?

Fixed setup and overhead are the same whether you run 50M or 500M bags, so a longer run spreads that $525 of fixed cost over more units. Double the run to 500M and per-thousand cost falls toward $13.55.

What run length makes a job economical?

It depends on how much per-thousand premium you can accept. With $525 fixed cost, a 50M run adds $10.50/M of setup burden versus only $2.10/M on the 250M example run, so short runs need a setup surcharge.

Does this include resin cost?

Only if you build it into the variable cost per thousand. The $12.50/M rate should already roll in film, ink, and machine time; setup and overhead are tracked separately as fixed charges.

How do I quote a bag job from this?

Run the total cost, divide for cost per thousand, then add your target margin. The $14.60/M figure is your floor; price below it and the run loses money.

Industrial Packaging Materials Manufacturing calculator

Bag Converting Output Calculator

Bag converting cost is the fully loaded cost of running a bag-making job, blending the per-thousand material and machine cost with fixed setup and shared overhead. Converting plant estimators and production managers use it to price poly mailer, pouch, and wicketed-bag runs and to see how setup amortizes across the run length. It matters because converting is a high-throughput, thin-margin business where a short run can carry crippling setup cost per thousand while a long run dilutes it to near nothing. Knowing the true per-thousand cost is what separates a profitable quote from one that loses money on the bindery floor.

What this calculator does

Estimate the total cost per thousand bags on a converting line by combining film cost, labor, setup, and overhead so you can quote jobs or compare run scenarios.
Use this when quoting a bag converting job, comparing material options, or reviewing whether the cost per thousand bags leaves enough margin at the quoted selling price.
It computes the total converting run cost and the resulting cost per thousand bags from variable, setup, and overhead inputs.

Formula used

Total converting cost = run quantity x variable cost per thousand + fixed setup cost + overhead and burden
Cost per thousand bags = total converting cost / run quantity

Inputs explained

Run quantity:
Variable cost per thousand:
Fixed setup cost:
Overhead and burden:

How to use the result

Use it when quoting a bag job or deciding a minimum economical run length before setup overwhelms the per-unit price.
It assumes a single setup and flat variable rate, so it understates cost for jobs with mid-run material changes, multiple makereadies, or scrap-heavy startups.

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 producer price index for paperboard and containers stands at 276.831 (BLS, May 2026), up 8.8% from a year earlier. Quotes priced off last quarter's material cost miss this move.

Common questions

How do you calculate bag converting cost? Multiply run quantity by variable cost per thousand, then add setup and overhead. For 250M bags at $12.50/M plus $350 setup and $175 overhead: 250 x 12.50 + 350 + 175 = $3,650 total.
What is the cost per thousand bags? Divide total run cost by run quantity in thousands. Here $3,650 / 250 = $14.60 per thousand bags, which is $2.10 above the bare variable rate of $12.50 because setup and overhead are spread across the run.
Why does cost per thousand drop on longer runs? Fixed setup and overhead are the same whether you run 50M or 500M bags, so a longer run spreads that $525 of fixed cost over more units. Double the run to 500M and per-thousand cost falls toward $13.55.
What run length makes a job economical? It depends on how much per-thousand premium you can accept. With $525 fixed cost, a 50M run adds $10.50/M of setup burden versus only $2.10/M on the 250M example run, so short runs need a setup surcharge.
Does this include resin cost? Only if you build it into the variable cost per thousand. The $12.50/M rate should already roll in film, ink, and machine time; setup and overhead are tracked separately as fixed charges.

Last reviewed 2026-05-12.