Calculators

Every result is a prescriptive estimate you verify with your building department. See the disclaimer.

Early access. Open testing — every calculator is fully available, no account needed. Payments are off.

Wall Framing

Stud takeoff, IRC header sizing, plates, king/jack/cripple studs, drag-and-drop wall builder. Free to use.

R602 (Wall Construction)

Rafter & ridge sizing with snow load analysis, gable and hip.

R802 (Roof-Ceiling) · ASCE 7 Ch.7 (snow)

Joist & beam sizing, span tables, TJI option, deflection check.

R502 (Floors)

Solves backward from your floor-to-floor height. Riser/tread, stringer layout, section drawing, and a plain-language R311.7 code check.

R311.7 (Stairways) · R312 (Guards)

Joists, beam, posts, footings, ledger fasteners, and guards per R507.

R507 (Decks) · R312 (Guards)