Part Cost Calculator

Calculate per-part injection molding cost from material, machine time, and amortized mold cost.

Inputs

Part Weight

Material Price

$/kg

Cycle Time

sec

Machine Rate

$/hr

Number of Cavities

Scrap Rate

Mold Cost

Lifetime Quantity

parts

Tab to move between fields

Results

Total Cost per Part

$0.29

Material Cost per Part$0.08

Machine Cost per Part$0.15

Mold Cost per Part$0.07

Parts per Hour576

Parts per 8-hr Shift4,608

Annual Capacity (24/7)3,456,000 parts

How to Use This Calculator

Enter part weight (g) and material price per kg for your resin.
Set cycle time (sec), press hourly machine rate ($), and number of cavities.
Enter expected scrap rate (%) for your process.
Review total cost per part broken down into material, machine, and mold amortization components.
Use parts-per-hour output to validate production throughput against your order volume.

How the result changes with Number of Cavities

Number of Cavities	Total Cost per Part
7.3	$0.22
23	$0.17
42	$0.16
58	$0.15

What each input means

Part Weight: Weight of a single finished part.
Material Price: Resin price per kilogram (e.g., PP: $1.50, ABS: $2.50, PC: $4.00).
Cycle Time: Total cycle time per shot.
Machine Rate: Fully loaded machine hourly rate (machine + operator + overhead).
Number of Cavities: Number of cavities producing parts per cycle.
Scrap Rate: Percentage of parts rejected plus runner regrind loss.
Mold Cost: Total mold tooling cost to amortize.
Lifetime Quantity: Total expected part quantity over the mold's lifetime.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Part Weight = 30, Material Price = 2.5, Cycle Time = 25, Machine Rate = 85 = 8 input(s) provided
Calculate Total Cost per Part
Total Cost per Part
0.2891 = $0.289
Calculate Material Cost per Part
Material Cost per Part
0.0765 = $0.077
Calculate Machine Cost per Part
Machine Cost per Part
0.1476 = $0.148

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