Material Cost Per Part Calculator

Estimate resin material cost per molded part. This practical tool is an engineering estimate—validate decisions against machine, material, mold, and process data.

Formula and method

Allocated resin mass × resin price, adjusted for unrecovered scrap.

Inputs and units

Enter measured or specified values in the displayed units. Keep units consistent; results are rounded for practical planning. This first release uses the displayed engineering units rather than a unit-switcher.

Worked example

(45 g + 12 g ÷ 2 cavities) ÷ 1,000 × $2.40/kg × 1.03 scrap = $0.13 per part.

Use this for material-only planning

Allocate part and runner mass across cavities, then apply resin price and unrecovered scrap. Add conversion, quality, packaging, and logistics separately.

What changes the result most

Purchased resin price, runner policy, cavity count, regrind policy, and scrap.

Common mistake

Presenting material cost as a full molded-part quotation.

Interpretation, assumptions, and limitations

This tool provides an estimate for planning and education. It does not replace machine maker limits, material data sheets, mold trials, cavity-pressure data, process validation, or qualified engineering review.

FAQ

Can I use this as a final production setting?

No. Confirm with validated process data and the applicable machine and material documentation.

Why can the real result differ?

Geometry, melt behavior, pressure loss, material lot, temperature, cooling layout, and operating practice can materially affect results.