Conduit Bend Offset Calculator

Inputs

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Perpendicular distance the conduit needs to move around the obstruction.
in
Angle of each bend in the offset. Lower angles use more run but usually pull easier.
Straight route distance available for the offset between nearby boxes, couplings, obstructions or pull points.
in
Sum of other bends already planned between pull points in the same conduit run.
°

Results

Default result
Edit inputs
Distance between bend marks(D)
8in
Pass

Multiplier 2.000 for a 30 deg bend.

Also computed

Shrink allowance(S)Pass1.072in

Subtract from the far-end reference for a two-bend offset layout.

Projected run between bends(R_b)6.9282in

Straight route distance consumed by the offset between bend points.

Straight-run margin(R_margin)Pass11.07in

Available straight run exceeds the projected offset run.

Offset multiplier(M)Pass2x

M = 1 / sin(angle).

Bend angle used(a)30°

Lower angles need more spacing; steeper angles use less run but can pull harder.

Added bend total(B_add)60°

Two equal bends: added bend total = 2 x angle.

Two-bend offset layout offset mark spacing 30 deg bend Shrink moves the far end back by offset x tan(angle / 2). Verify bender marks and field clearances.
Method notes 3 notes
  • Formula: mark spacing D = offset / sin(angle). Offset shrink S = offset x tan(angle / 2).
  • Projected run between bend points is D x cos(angle), which is the straight-route space consumed by the offset geometry.
  • Field accuracy still depends on conduit size, bender shoe radius, the tool mark used for each bend, dogleg control, couplings, supports and the adopted electrical code.

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