Shot Volume Calculator

Convert injection molding shot weight to melt volume. This practical tool is an engineering estimate—validate decisions against machine, material, mold, and process data.

Formula and method

Shot volume = shot weight ÷ melt density.

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

180 g ÷ 0.95 g/cm³ = 189.47 cm³.

Use this for volumetric injection checks

Convert a known shot mass to volume before comparing it with screw stroke or an injection-unit volume. Use melt density, not a finished-part solid density.

What changes the result most

The density basis and processing temperature. Record where the density value came from.

Common mistake

Using a machine PS shot-weight rating as though it were a universal volume rating.

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.