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Rolling Offset Calculator

Conduit rolling-offset developed length from horizontal and vertical offsets.

Enter horizontal and vertical offsets and select a standard bend angle to get true offset and developed length.

Material List
Set the rolling offset to 10 in of travel.

Rolling offset inputs

True offset is computed from horizontal and vertical offsets, then the bend-angle multiplier table is applied.

Bend angle

Not sure which to pick? 45° is the most common trade bend and gives the shortest travel length for a given offset.

Set the rolling offset to 10 in of travel.

Set offset to

Rolling offset estimate

True offset
10 in
Developed length
14.1 in

Detail values

Assumptions

  • Bend angle: 45°
  • Multiplier: 1.41

Included: true offset, developed length.

Not included: labor, verification against manufacturer or local-code specifics beyond the reference table used, material waste from cutting.

Formula details
  • True offset: sqrt(horizontalOffset^2 + verticalOffset^2)
  • Developed length: trueOffset x multiplier(bendAngle)

    multiplier = 1 / sin(bendAngle), exact trigonometric identity.

FAQ

What is a rolling offset?

A rolling offset combines a horizontal and a vertical offset into a single 'true offset' distance (via the pythagorean relationship), then applies the same bend-angle multiplier used for a standard offset bend.