Materials calculator

3D Part Weight Calculator

Upload a STEP file to calculate its modeled solid volume and weight from a Fabworks material, engineering material, or custom density—all in your browser.

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.

Quick answer

How this step part weight calculator works

STEP part weight equals the solid volume stored in the model multiplied by material density. This calculator reads supported closed solids locally in your browser, so modeled holes, cutouts, and bends are included without installing software.

How to use the calculator

  1. 1Drop a .stp or .step file into the uploader.
  2. 2Select a Fabworks alloy, a general engineering material, or enter a custom density.
  3. 3Choose the volume, surface-area, and weight units you want to see.
  4. 4Use the result for quoting and handling estimates, then verify critical values against certified material density and finished-part details.

Worked example

A36 steel STEP part

Inputs
A closed STEP solid with 10 in³ of modeled volume using 0.283 lb/in³ steel.
Result
Estimated part weight = 2.83 lb.

The browser reads the modeled solid volume, then multiplies it by the selected density.

Common questions

What to know before using the result

Does STEP weight calculation happen in the browser?
Yes. The file is parsed locally in the browser to find solid volume, and the selected density is applied there. The calculator does not require a software download.
Does the estimate include holes and cutouts?
A successfully parsed solid STEP model includes modeled holes, cutouts, and formed geometry.
Why might a STEP file fail to calculate?
The file must contain a supported closed solid. Surface-only geometry, open shells, malformed exports, or unsupported STEP entities may not provide a usable solid volume.

Formula

m = V × ρ

The browser reads the solid volume from the STEP model and multiplies it by the selected material density.

Engineering references

Assumptions and limits

  • The STEP file must contain at least one supported closed solid body.
  • Modeled holes, cutouts, bends, and other solid geometry are included in the volume.
  • Coatings, hardware, protective film, and unmodeled manufacturing features are excluded.
  • Published density values are representative; verify alloy certificates when tolerances matter.
Educational estimate
Use this result for learning and early design exploration. Verify safety-critical or production decisions with the governing standard, material data, real tooling, and a qualified engineer.

Keep designing

Order Sheet Metal Parts

Upload a 2D DXF or 3D STEP file for an instant laser cutting quote. Quote in seconds, order in minutes, receive parts in days.

STEP / DXF up to 24MB

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