FlowLine Isometric vs SM Offset

Flowline is a professional isometric piping diagram tool built for pipefitters, plumbers, mechanical engineers, and contractors who need to sketch and document pipe runs quickly on site or in the office. Draw in true isometric projection with a snap grid that keeps every line on axis. Flowline handles the geometry so you can focus on the layout.

SM Offset is a field calculator for sheet metal workers, HVAC fabricators and pipefitters, built by a working sheet metal tradesman. Every calculator is free, it works with no signal, and answers come out in real tape-measure fractions. ROUND • Two-elbow offset: cut joint, travel and multiplier for a flat offset • Rolling offset: rise and roll combined into one true offset, with the cut length to match RECTANGULAR • Radius elbows: two radius elbows plus a straight joint, with cut joint, travel and multiplier • Mitered offset: square-throat elbows, with cheek length and miter setback • Offset in a length: drop in the run you have, and the app works out the angle TOOLS • Duct resizer: something in the way? Shrink a side, keep the airflow • Equivalent duct: round to rectangular and back (ASHRAE equal-friction and equal-area) • Fraction ⇄ decimal, right triangle (any two values), arc length SEND IT TO THE CREW • Share any offset result as a text, with every size, angle and cut length WHY TRADES TRUST IT • Every offset is exact trig, cross-checked two independent ways • A live drawing of the fitting as you type • Fractions to 1/16" (or 1/32"), decimals, or metric • Your shop's connection allowance, set once • Recent calculations saved automatically • Fast, dark, glove-friendly Whether you're laying out ductwork in the shop or solving an offset on the roof, SM Offset gives you numbers you can cut to.