Pipe Rolling Offset Calculator

Inputs

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Vertical or set direction the pipe centerline must move.
in
Horizontal roll direction perpendicular to the rise or set.
in
Angle of each offset fitting or miter. Common rolling offsets use two equal fittings.
Center-to-end takeout for one fitting. The calculator subtracts two fittings from center-to-center travel.
in
Straight route distance available for the offset advance between nearby tie-in points, hangers, obstructions or spool ends.
in

Results

Default result
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True offset (O_t)
20 in
Pass

True offset = sqrt(rise^2 + roll^2).

Also computed

Center-to-center travel (L_c) Pass 28.284 in

Travel = true offset x 1.414.

Pipe cut length (L_cut) Pass 25.284 in

Cut length = center-to-center travel - 2 x fitting takeout.

Advance along run (A) 20 in

Advance is the projected route distance between fitting centers.

Roll angle (phi) Pass 53.13 °

Roll angle is atan(roll / rise), measured from the vertical set plane.

Offset multiplier (M) Pass 1.4142 x

M = 1 / sin(fitting angle).

Total takeout (2T) 3 in

Two equal fittings: total takeout = 2 x takeout per fitting.

Rolling offset centerline rise advance travel 45 deg fittings True offset combines rise and roll. Cut length subtracts user-entered fitting takeout from center-to-center travel.
Method notes 3 notes
  • Formula: true offset O_t = sqrt(rise^2 + roll^2). Center-to-center travel L_c = O_t / sin(angle).
  • Pipe cut length subtracts user-entered fitting takeout from both ends: L_cut = L_c - 2T.
  • This is centerline layout geometry only. It does not include fitting charts, weld gap, bevel, socket depth, thread engagement, slope, hanger movement, code requirements or manufacturer spool tolerances.

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