Rolling Offset Calculator

Find the diagonal pipe length (travel) and horizontal run to route around an obstacle.

How the Math Works

The Rolling Offset Calculator uses trigonometric principles to determine the required lengths of pipe segments when changing direction. The formula 'travel = offset ÷ sin(angle)' calculates the diagonal length (hypotenuse) of the offset triangle, where the offset is the perpendicular distance between the start and end points. Similarly, 'run = offset ÷ tan(angle)' computes the horizontal or vertical distance along the direction of the pipe. These formulas assume a right triangle formed by the offset, travel, and run, with the angle representing the bend's slope relative to the horizontal plane.

Practical Applications

To use this calculator, first measure the vertical or horizontal offset between the start and end points of your pipe run, then determine the angle of the bend (e.g., 45° for a standard elbow). Input these values into the calculator to instantly find the travel distance (for cutting the pipe's diagonal segment) and the run (for aligning the offset horizontally or vertically). This ensures precise cuts and proper alignment, eliminating guesswork when routing pipes around obstacles like walls, columns, or structural elements in plumbing, HVAC, or industrial systems.

Day-to-Day Use

Whether you're a professional contractor or a DIY enthusiast, this tool simplifies complex pipe installations by providing exact measurements. For example, if rerouting a water line behind a cabinet or adjusting a drainage pipe around a beam, you can quickly calculate the correct lengths needed to avoid misalignment or material waste. It saves time, reduces costly rework, and ensures a clean, professional fit—whether you're working on a home renovation, commercial project, or maintaining industrial equipment.

Worked example

12 in offset with 45° fittings → 16.97 in travel.

FAQ