STL Volume Calculator

Calculate exact cubic volume (cm³), surface area, and mass weight (grams) of STL 3D models locally in your browser. 100% private STL file analyzer.

⚡ Interactive Calculation Engine Active

Please enable JavaScript in your browser to run live computations, 2D envelope diagrams, and export PDF reports.

How to Use STL Volume Calculator

  1. Drag and drop or select your 3D STL model (.stl binary or ASCII).
  2. File parses 100% locally in browser memory using HTML5 ArrayBuffers (no files uploaded).
  3. Select your target material (PLA, PETG, ABS, Resin, Aluminum, Steel).
  4. Instantly view total volume in cm³ and mm³, surface area, triangle count, and solid mass in grams.

What is the STL Volume Calculator?

A high-performance in-browser 3D file analyzer that calculates the exact cubic volume (cm³ and mm³), surface area, triangle count, and mass of 3D models without server uploads.

Formula Used

• Signed Tetrahedron Volume = (v1 · (v2 × v3)) / 6 • Total Mesh Volume = Sum of all signed tetrahedron volumes for all mesh facets • Mass (grams) = Mesh Volume (cm³) × Infill % × Material Density (g/cm³)

Real-World Example

An STL model of a custom drone arm has a calculated solid mesh volume of 42.5 cm³: • 100% Solid PLA (1.24 g/cm³) = 42.5 × 1.24 = 52.7 grams • 20% Infill Estimate = 52.7 × 0.20 + Shell Perimeter Weight (~8g) = ~18.5 grams.

Accuracy and Limitations

Calculates 100% solid watertight manifold volume. For sliced hollow prints, combine with infill percentage estimators.

Who It Is For

Designers estimating raw production cost directly from exported CAD STLs before opening slicers.

Frequently Asked Questions

What is an STL Volume Calculator?
An STL Volume Calculator is a browser-based 3D mesh analyzer that reads triangular facet coordinates in an STL file to calculate its exact cubic volume (cm³) and projected weight.
Are my proprietary STL 3D models uploaded to your server?
No! Toolique processes 100% of STL files locally in your browser's WebAssembly and JavaScript sandbox. Your CAD designs never leave your device.
How is 3D mesh volume calculated from triangles?
Volume is computed using the Divergence Theorem (Signed Tetrahedral Volume Method) by summing the signed volume of tetrahedrons formed by each triangle and the coordinate origin.