Rolling Offset Calculator

A rolling offset is a pipe fitting technique used when you need to connect two parallel pipes that are offset both horizontally and vertically. It combines both horizontal and vertical movements using two angled fittings to create a smooth transition between the pipe runs.

First, calculate the resultant offset using the formula R = √(horizontal² + vertical²). Then calculate the travel distance using T = R / sin(bend angle). The run advance is calculated as A = R / tan(bend angle).

For a 45° rolling offset, measure your horizontal and vertical offsets, calculate the resultant offset, then multiply by 1.414 to get the travel distance. The advance equals the resultant offset since tan(45°) = 1.

Pipe offset multipliers are constants used to quickly calculate travel and advance distances. For common angles: 22.5° = 2.613, 30° = 2.000, 45° = 1.414, 60° = 1.155, 90° = 1.000. Multiply your resultant offset by these values to get travel distance.

This calculator provides center-to-center measurements and does not automatically account for fitting shrink or take-up. You'll need to subtract the appropriate shrink values based on your specific fittings and installation method.

The angle of a rolling offset is determined by the fitting bend angle you choose (22.5°, 30°, 45°, 60°, or 90°). This is typically based on available fittings and space constraints in your installation.

Yes, this rolling offset calculator works for any cylindrical runs including electrical conduit, plumbing pipes, HVAC ducts, and other piping systems that require offset connections.

Travel is the center-to-center distance between the two fittings along the angled pipe section. Advance is how much the pipe run moves forward along its original direction while making the offset.