Conduit Offset Calculator
When conduit has to jog sideways around an obstacle, two bends at the same angle make an offset. This works out how far apart the bends sit and how much the run shortens.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
The distance between the two bends is the offset height divided by the sine of the bend angle. Shrink, the amount the run gets shorter, is the offset height divided by the tangent of the angle.
Common bend angles are 10, 22.5, 30 and 45 degrees. Each one follows from the same two formulas, so any angle from 1 to 89 degrees works here.
Worked example
An offset of 4 in with a 30 degree bend puts the bends 8 in apart, and the run shrinks by 6.93 in.
Questions
What is shrink used for?
It tells you how far back from the obstacle to make the first bend, so the finished run lands where it should.
Does this allow for the bend radius?
No. It treats each bend as a point. Add the radius and any fitting allowances for the actual bender on the job.
Why does a shallow angle need more room?
A shallow angle stretches the offset over a longer run, so the shrink gets bigger and the bends sit farther apart.
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