CalculusThe structural & analytical model editor in your browser.

Build BIM models, run FEM analysis, and exchange with IFC and Tekla Structures — without installing anything.

🏗️

Structural (BIM) Modeling

Beams, plates, bolts, welds, rebars, cuts, grids, and annotations with parametric profiles, materials.

📐

Build a separate analytical model with nodes, 1D members, hinges, supports, point and line loads.

📊

Run a linear static FEM analysis in the browser. Inspect displacements, member forces, and reactions in the FEM Results pane.

🔁

Import IFC, glTF, PLY, OBJ as references. Export to IFC 4x3. Round-trip with Tekla Structures via the CalculusTeklaLink plugin.

📚

European steel sections, concrete grades, DIN bolt assemblies, and B500 rebar grades — extend or replace with your team's libraries.

🌐

Runs in any modern browser. Installs as a PWA, autosaves to your browser, and works offline. No license, no install.