HVAC ductwork takeoff and sheet-metal calculator. Enter a fitting's dimensions and get its surface area, GI sheet weight, SMACNA gauge and a bill of materials you can export.
Live: https://ductforge.debugswift.com · free, no sign-up, works offline once installed
- Ten fittings: straight duct, transition, elbow, offset, collar and Y-piece in rectangular, plus round duct, gored round elbow, concentric cone and square-to-round
- Eight flat pieces: rectangle, circle, ring, holed plate, frame, flat oval, triangle and trapezoid
- Two measuring standards: commercial billing (what goes on an invoice) and shop fabrication (the true unfolded blank a fabricator cuts)
- Three drawings of every fitting: a dimensioned blueprint, a flat pattern with cut and fold lines, and an isometric view you can turn
- Beyond the sheet: insulation area, flanges, hangers, zones, extras (dampers, grilles, labour), and your own rates per kg or per m²
- Metric or imperial, switchable at any time with no rounding
- A printable takeoff sheet, every part switchable, previewed live and saved as PDF
Takeoffs stay on your device. Nothing is uploaded.
- How to take off a duct job: the workflow, step by step
- Standards, formulas and constants: every formula for both standards, the gauge table, materials, allowances, and what each one simplifies
- Changelog: what changed, and when
The guide is also live in English, বাংলা and हिन्दी.
Report it here. A wrong result is the most useful thing you can send. Please include the dimensions you typed.
DuctForge's source is private. This repository is its public home: documentation, changelog and issue tracker.
Built by DebugSwift.