Materials calculator

STEP File Weight Calculator

Upload a STEP file to calculate modeled solid volume, surface area, and part weight locally in your browser with no software installation.

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 file weight calculator works

A STEP file can provide the closed-solid volume needed to estimate part weight. This tool parses supported solids locally in your browser, includes modeled holes and cutouts, and multiplies volume by the selected material density.

How to use the calculator

  1. 1Drop a .stp or .step file containing at least one supported closed solid into the browser uploader.
  2. 2Choose a Fabworks material, search the engineering material catalog, or enter a custom density.
  3. 3Select the weight, volume, and surface-area units needed for the result.
  4. 4Review each detected body and the total, then verify critical values against the CAD system and certified material data.

Worked example

Steel STEP part with cutouts

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

Because volume comes from the closed solid, modeled holes, cutouts, pockets, and formed geometry are already reflected in the result.

Common questions

What to know before using the result

Is my STEP file uploaded to calculate its weight?
No. Solid parsing and weight calculation run locally in the browser. Sending the part to a Fabworks quote is a separate action you control.
Why does a STEP file fail to calculate?
Surface-only models, open shells, malformed exports, unsupported entities, or files without a supported closed solid may not contain usable volume.
Are holes, cutouts, and bends included?
Yes, when they are represented in a successfully parsed closed solid. Coatings, hardware, and other unmodeled details remain excluded.

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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