Rolling Offset Calculator

When a pipe must shift in both the vertical and horizontal directions at once, that combined diagonal move is called a rolling offset — and this calculator gives you the exact fitting lengths needed to make it work. Enter the vertical offset (rise), horizontal offset, and fitting bend angle to get the Travel Distance (center-to-center). Secondary outputs include the resultant offset, run advance, and the offset and advance multipliers used in the calculation.

in

Vertical distance between pipe centerlines

in

Horizontal distance between pipe centerlines

°

Enter custom angle if selected above

Results

Travel Distance (Center-to-Center)

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Resultant Offset (R)

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Run Advance

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Offset Multiplier

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Advance Multiplier

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Frequently Asked Questions

What is a rolling offset?

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.

How do I calculate the pipe rolling offset?

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).

How to do a 45-degree rolling offset?

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.

What are pipe offset multipliers?

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.

Does this calculator account for shrink?

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.

How do I find the angle of a rolling offset?

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.

Can I use this calculator for conduit and electrical work?

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.

What's the difference between travel and advance?

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.