STEP File Weight Calculator

Upload a STEP file to get its weight in your browser, without opening CAD.

Upload a STEP part for its actual modeled weight

We read exact solid volume from the model, so holes, cutouts, and bends are included. Choose a material to calculate its weight.

Drop a STEP file here

.stp or .step, up to 24 MB. Nothing is uploaded.

Part weight

Upload a part to see its modeled weight and a body-by-body breakdown.

Ready to manufacture this part? Upload the STEP file in the quote builder for Fabworks manufacturability feedback, pricing, and lead time.

How it works

A STEP file stores geometry, not weight. This tool reads the volume of the solids in the file and multiplies it by the density of the material you pick. You can weigh a customer or vendor model without CAD installed. The material stored in the file, if any, is ignored.

How to use the calculator

  1. 1Drop in a .stp or .step file. For STL, IGES, or native CAD files, export a STEP solid first.
  2. 2Choose the material. If you do not know the alloy, weigh it twice. The same part in steel is about 2.9 times heavier than in aluminum.
  3. 3For an assembly, read the weight of each body in the list as well as the total.

A vendor bracket

Inputs
A STEP file with 4.20 in³ of solid, weighed as 5052-H32 aluminum (2,680 kg/m³) and as A36 steel (7,861 kg/m³).
Result
Aluminum = 0.407 lb. Steel = 1.193 lb.

The volume is the same, so only the density changes. 4.20 × 0.0968 lb/in³ = 0.407 lb, and 4.20 × 0.284 lb/in³ = 1.193 lb.

What to know before using the result

Does it work on assemblies?
Yes, it weighs every solid in the file and adds them. All of them get the same density, so a steel frame with aluminum panels will be wrong. Export each material group as its own STEP file.
Why does SolidWorks or Fusion show a different weight?
Start with density. Your CAD program weighs with the material assigned in that file, and this tool uses the one you pick. If the weights still differ by a large factor, the export used the wrong units.
Can I weigh an STL or mesh file?
No, only .stp and .step files are read. Export the model from your CAD program as a STEP solid.

Formula

m = V × ρ

Your browser reads the volume of each solid in the STEP file and multiplies it by the density you pick.

Assumptions and limits

  • The file needs at least one closed solid. Surface models and open shells have no volume.
  • One density is applied to every body in the file.
  • Coating, paint, and hardware that is not modeled are not counted.
  • Densities are typical values for each alloy. Use Custom if you have a mill cert.

Keep designing

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STEP / DXF up to 24MB

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