Engineering Calculations
Wood design to the NDS & SDPWS, and mechanical HVAC loads to ACCA Manual J — every equation, substitution and code reference shown in full, with a printable calculation package.
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Wood Design
Structural sizing to the AWC National Design Specification (NDS) and the Special Design Provisions for Wind & Seismic (SDPWS).
- Beams, columns & combined loading
- Diaphragms, shear walls & connections
- Whole-building lateral force distribution
Structural Panels
Structural insulated panels (SIPs) by sandwich theory — facings, core shear, wrinkling, deflection and buckling.
- Roof / floor and wall panels
- Facing & core checks with code references
- Validated against sandwich-panel mechanics
Foundations
Reinforced-concrete footings to IBC Ch. 18 & ACI 318 — soil bearing, shear and flexure with full code references.
- Spread (isolated) & continuous (wall) footings
- Combined two-column footings
- One-way / punching shear & reinforcement
Geotechnical
Soil capacities behind the foundation tools — bearing capacity, pile & pier axial, lateral pier embedment and earth pressure.
- Shallow bearing capacity (Vesić)
- Pile / pier skin friction + end bearing
- Lateral pier (IBC 1807) & earth pressure
Hydraulics
Open-channel and pressure-pipe flow — Manning, Bernoulli energy, pipe head loss, and specific-energy / critical depth.
- Manning flow (rect / trap / triangular / circular)
- Bernoulli energy & pipe head loss (Darcy / Hazen-Williams)
- Critical & normal depth, Froude, hydraulic jump
Concrete Design
Reinforced concrete & steel base plates to ACI 318-19 and AISC DG1 — columns, beams, walls, headers, footings & connections.
- Column P-M, beams, slender beam-columns
- Shear walls with openings & opening headers
- Footing + moment & steel base plate + moment
Mechanical
Residential heating & cooling load calculations by the ANSI/ACCA Manual J method, with equipment sizing.
- Whole-house or room-by-room loads
- Design-condition & U-value libraries
- Code-referenced, printable calc package
Wood design tools
Individual calculators
Size a single beam, column, diaphragm, shear wall or connection with your own inputs — no project required.
- Beam & column design
- Diaphragm & shear wall (segmented / perforated)
- Connections incl. Simpson hardware
Building project
Lay out shear walls in plan on each floor, distribute story forces (rigid or flexible), then design every wall and diaphragm — all in one workspace.
- Custom diaphragm shapes (rectangle, L, T, U, polygon)
- Auto-uploads shear into a calculator per element
- Toggle element tabs · 3D model of the finished building