Available nowO.W.L. Offset Calculator
Square/rectangular O.W.L. math using Offset × Width ÷ Length, plus separate round/spiral pipe-style rolling offset math.
Square / rectangular: Offset × Width ÷ Length, angle, travel, and run/advance.
Round / spiral: true rolling offset, travel, advance/run, and cut length after takeoffs.
Use when: an offset is shown on plan, a trade conflict forces an offset, or you need to ask the foreman with actual numbers.
How to thinkO.W.L. system
O.W.L. = Offset × Width ÷ Length
O = Offset. How far the duct needs to move.
W = Width. The duct width/layout width.
L = Length. The available offset length/run.
Coming nextMore calculators can live here
This page is now the obvious home for field math tools. Future calculators can be added here without hiding them inside search.
Duct area / CFM helper — later
Flex length / support reminder — later
Hanger spacing checklist — later, with project-spec guardrails
Field use: Educational aid only — not job approval. Drawings/specs, manufacturer instructions, employer policy, foreman direction, and AHJ/local code win.
Safety · Terms · Privacy
