Kouzouki Structural calculators
AWC NDS 2018 / 2024 · SDPWS · independently validated

Wood design calculators
that show their work.

Size beams, columns and shear walls to the AWC National Design Specification & SDPWS — every equation, substitution and code clause on screen, with a downloadable validation report. Three are free to use.

Open a free calculator
Show-your-work output Code-referenced Validated · PDF report
Free · no sign-in

Live on Kouzouki.com

Full-featured, validated wood calculators — open one and start designing.

Free

Wood Beam

Bending, shear, deflection & bearing per NDS Ch. 3–4 — continuous multi-support beams, LVL/PSL sections, snow loads & ASD/LRFD.

Open calculator → Free

Wood Column

Axial compression, column stability (CP) and combined axial + bending per NDS 3.7–3.9.

Open calculator → Free

Wood Shear Wall

Segmented or perforated shear-wall design per SDPWS 4.3, with openings and unit-shear / hold-down demand.

Open calculator →
+

More to come

New free calculators are added regularly — or unlock the full engineering suite below.

Coming soon
Members

The full engineering suite

40+ validated calculators across wood, concrete, foundations, geotechnical, hydraulics, HVAC, log (ICC 400), structural panels, metal buildings and contractor tools — plus the whole-building project workspace. Every tool shows its work and ships with an independent validation report.

Concrete Design Foundations Geotechnical Hydraulics & Pipe Networks HVAC · Manual J Log · ICC 400 Structural Panels (SIP) Metal Buildings Contractor tools Diaphragms · connections · hold-downs · ledgers Building project workspace
Enter the full suite

Members sign in once. Not a member? Request access · or ask us to build a custom calculator.