Runner Weight Calculator

Cold-runner mass from runner volume and the stated material density. Use this as a documented planning estimate, then validate it against the actual machine, mold, resin, and process.

Formula and method

Runner mass = runner volume x density.

Use a solid-density value for a cooled runner mass estimate, or weigh a stable runner sample.

Inputs and units

Use controlled records, CAD, measured production data, the exact resin data sheet, or machine-maker specifications. Keep the material and time basis with the result.

Worked example

22.62 cm3 x 1.05 g/cm3 = 23.75 g.

What the result supports

This result is a first-pass screen for materials planning. Use it to identify the next record or engineering check, not as a release decision.

Sanity check

Check the unit basis and whether all quantities describe the same cavity, shot, machine, or production window before comparing values.

Important limitation

Do not use a finished-part density for a barrel-volume comparison.

Reference: Autodesk: runner layout.

Next calculation

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FAQ

What must be checked after using runner weight calculator?

Retain the input source and compare this estimate with the applicable machine, mold, supplier, or production record before relying on it.