Rolling Offset Calculator

What is a Rolling Offset?

A rolling offset is a pipe fitting technique used when two pipelines need to be connected that are offset in both horizontal and vertical directions. Imagine a pipe entering one corner of an imaginary box and exiting the opposite diagonal corner. The rolling offset calculator helps determine the travel length, true offset, and run needed to complete this connection using bent pipe fittings.

Whether you are working on plumbing, HVAC, or industrial piping systems, understanding rolling offset calculations is essential for proper pipe installation. Our pipe offset calculator eliminates guesswork and provides accurate measurements for any bend angle.

How to Use the Rolling Offset Calculator

Using our pipe rolling offset calculator is straightforward. Enter the horizontal offset and vertical offset measurements for your pipeline. Then select your preferred fitting bend angle (22.5°, 45°, 60°, 90°, or a custom angle). The calculator instantly computes the true offset, travel length, run, and the offset multiplier.

For standard pipe fittings, the 45-degree bend is most commonly used. If you are bending your own pipe or using custom-angle fittings, select "Custom" and enter your desired bend angle.

Rolling Offset Formulas

The rolling offset calculation involves two right triangles. First, the true offset ($c$) is the hypotenuse of the triangle formed by the horizontal ($h$) and vertical ($v$) offsets:

$$c = \sqrt{h^2 + v^2}$$

The travel length ($T$) is then calculated using the true offset and the bend angle ($\theta$):

$$T = \frac{c}{\sin(\theta)}$$

The run ($R$) can be found using the tangent function:

$$R = \frac{c}{\tan(\theta)}$$

Pipe Offset Multiplier Chart

For quick calculations in the field, pipe fitters often use offset multipliers. These constants allow you to find the travel length by multiplying the true offset by the appropriate multiplier:

• 22.5° - Multiplier: 2.6131
• 45° - Multiplier: 1.4142
• 60° - Multiplier: 1.1547
• 90° - Multiplier: 1.0000