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Free casting weight calculator

Read your model’s volume and compare its weight in common casting alloys. Add a yield allowance for the melt and review a riser starting point.

Runs in your browser. Your file is never uploaded.

Your model

Drop an STL, OBJ, or 3MF here.

Up to 250 MB. All processing stays on your device.

Files stay on your device.

Options

Used for the custom choice.
Covers the sprue, runners, and risers.
Green sand is usually 2–4. Calibrate it for your process.

Result

Choose a file or try the example.

How it works

  1. 1

    Read your model

    Drop a mesh and confirm its units. Open meshes are labeled as estimates.

  2. 2

    Compare alloys

    Choose your alloy and casting yield to include runners, sprues, and risers.

  3. 3

    Check the report

    Review volume, surface area, weight, and the whole-part riser calculation.

Riser starting point
This treats the whole part as one block. Foundries size risers from the heaviest section.
Melt yield
Casting weight divided by yield gives the melt to pour. A 60% yield reserves 40% for the gating system.
Typical values
Casting numbers are estimates. Check alloy density, pour temperatures, and burnout schedules with your alloy supplier or investment maker.

Questions

Can I trust the volume of an open mesh?

Only as an estimate. Missing faces, overlapping shells, and inconsistent winding can distort the signed-volume calculation.

How is the riser derived?

The required modulus is 1.2 times casting volume divided by area. A cylinder with H = 1.5D cools from its top and sides. The calculation excludes its contact face.

Is my file uploaded anywhere?

No. The conversion runs in your browser with the JavaScript on this page. Your data never leaves your computer, and nothing is kept after you close the tab.

Quoting castings or patterns every week?

I build quoting tools that read a customer's CAD file, work out weight and metal cost, and price the job automatically.

Ask about automating itSee custom software work

Source code and license

You can inspect the code and the licenses here. Models are parsed and measured on your device.