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Rolling Pipe-Offset Travel Calculator

Calculate true offset, ideal travel, and setback from two perpendicular offsets and fitting angle.

Why it matters: Visible geometry and quantity arithmetic improves field coordination and makes allowances available for review.

User inputs

Enter field measurements

4 inputs
Select I-P or SI units for the entire input set.
in or mmFirst offset component.
in or mmSecond offset component.
degreesAngle above zero and below 90 degrees.

Calculated result

Engineering evaluation

Calculation complete—verify project criteria
Rolling-offset travel (L_t)18.385 in
True offset (O_t)
13 in
Ideal setback (S)
13 in

Engineering interpretation

The entered offset geometry requires 18.38478 in ideal centerline travel.

Important limitations

  • Geometric centerline screen only. Fitting takeouts, engagement, bend radius, field tolerances, thermal movement, slope, and fabrication standards remain separate.

Engineering knowledge center

Understand the calculation—not just the answer

2026-08-07 · Free Library
Governing relationships
O_t=√(O_1²+O_2²)
L_t=O_t/sinθ
S=O_t/tanθ
Current substitution

O_t=13; L_t=13/sin(45°)=18.38478; S=13.

Calculation sequence

Step-by-step method

  1. Confirm dimensions, formula symbols, unit system, and measurement sources.
  2. Apply the displayed geometry, quantity, or field-control equation.
  3. Review allowances, tolerances, constructability, and governing project requirements.

Equation legend

Inputs and calculated quantities

O_1
First perpendicular offset — in or mm
O_2
Second perpendicular offset — in or mm
θ
Fitting angle — degrees
L_t
Rolling-offset travel — in
O_t
True offset — in
S
Ideal setback — in

Continue the evaluation

Related calculators

Pipe Offset Travel Pipe Cut Length

Engineering calculation disclaimer

These engineering tools are provided for educational, preliminary evaluation, field verification, and commissioning support. Results depend on the accuracy of user-entered information and the assumptions stated for each calculation. Every colored status and comparison is a screening indicator only; project criteria, contract requirements, applicable codes, manufacturer instructions, measurement uncertainty, and authorized engineering judgment govern. The tools do not replace project-specific engineering analysis or the judgment of a licensed professional engineer.

Read the full use and limitation statement