Rolling Offset Calculator

Last updated: 27 Jun 2026 | Author: Brij | Review By: Irshad

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Calculate rolling offsets for conduit and piping systems with our Rolling Offset Calculator. Find true offset, travel, run, multiplier, and shrink using roll offset, set offset, and bend angle.

Roll Offset (H):

Horizontal offset distance

Set Offset (V):

Vertical offset distance

Fitting Bend Angle:

Typical: 45°, 60°, 90°

Travel (T) (Optional):

Leave empty to calculate automatically

Bend Type: Affects shrink calculation

Rolling Offset Calculation Results

True Offset (C):

√(H² + V²)

Travel (T):

C × Csc(θ) — diagonal pipe length along offset

Run (R):

T × Cos(θ) — horizontal advance along pipe run

Offset Multiplier:

factor

1 / Sin(θ)

Shrink:

T − R — straight pipe saved due to offset

Cosecant (Csc θ):

value

1 / Sin(θ)

A Rolling Offset Calculator helps electricians, pipefitters, plumbers, and conduit installers calculate the dimensions needed when a pipe or conduit must move both horizontally and vertically. A rolling offset occurs when an obstruction requires the pipe to change direction in two planes at the same time.

Instead of calculating the measurements manually, this calculator quickly determines the True Offset, Travel, Run, Multiplier, and Shrink required for accurate installation.

What Is a Rolling Offset?

A rolling offset is a pipe or conduit offset that combines:

A horizontal displacement (Roll Offset)
A vertical displacement (Set Offset)

Because the pipe moves in two directions simultaneously, the actual offset distance is longer than either individual offset. This distance is known as the True Offset.

Rolling offsets are commonly used in:

Electrical conduit installations
HVAC ductwork
Plumbing systems
Industrial piping
Mechanical construction projects

Formula 1: True Offset

The True Offset is calculated using the Pythagorean Theorem.

Formula

$C=\sqrt{H^2+V^2}$

Where:

(C) = True Offset
(H) = Roll Offset
(V) = Set Offset

Formula 2: Offset Multiplier

The multiplier depends on the fitting bend angle.

Formula

$\text{Multiplier}=\frac{1}{\sin(\theta)}$

Where:

( $\theta$ ) = Bend Angle

Formula 3: Travel

Travel is the actual length measured along the pipe between bends.

Formula

$T=C\times\text{Multiplier}$

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

Formula 4: Run

Run is the horizontal distance along the conduit path.

Formula

$R=T\times\cos(\theta)$

Formula 5: Shrink

Shrink represents the amount the conduit shortens because of the offset.

Formula

$\text{Shrink}=R-C$

Example Calculation

Suppose a conduit installation requires:

Roll Offset (H) = 20 cm
Set Offset (V) = 15 cm
Bend Angle = 45°

Step 1: Calculate True Offset

$C=\sqrt{20^2+15^2}$

$C=\sqrt{400+225}$

$C=\sqrt{625}$

$C=25\text{ cm}$

Step 2: Calculate Multiplier

$\text{Multiplier}=\frac{1}{\sin(45^\circ)}$

$\text{Multiplier}=1.414$

Step 3: Calculate Travel

$T=25\times1.414$

$T=35.36\text{ cm}$

Step 4: Calculate Run

$R=35.36\times\cos(45^\circ)$

$R=35.36\times0.7071$

$R=25.00\text{ cm}$

Step 5: Calculate Shrink

$\text{Shrink}=25-25$

$\text{Shrink}=0\text{ cm}$

Final Results

Measurement	Value
True Offset	25 cm
Multiplier	1.414
Travel	35.36 cm
Run	25.00 cm
Shrink	0 cm

Why Use a Rolling Offset Calculator?

A Rolling Offset Calculator eliminates manual calculations and reduces installation errors. It helps contractors, electricians, and pipefitters determine the exact measurements needed for conduit and piping systems, saving both time and material costs.

Whether you are installing electrical conduit, plumbing lines, or industrial piping, this calculator provides accurate results for planning and field work.

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