Calculators / Offset
Offset bend calculator
Enter how far the conduit needs to move over and the angle you'll bend. You get the distance between your two marks and how much the run shrinks.
Results
- Make your first mark.
- Make the second mark – from the first.
- Bend both marks to –, rolling the conduit 180° between bends.
- Add – of shrink to any measurement taken past the offset.
Want marks for your exact bender, 1st or 2nd bend critical? iBend Pipe uses your bender's centerline radius.
This depth at every angle
| Angle | Multiplier | Distance between bends | Shrink |
|---|
How the offset formula works
The distance between bends is the offset depth times the angle's multiplier. The multiplier is the cosecant of the bend angle (1 ÷ sin). At 30° it's exactly 2, so a 6″ offset needs marks 12″ apart.
Shrink is how much shorter the run gets because the conduit travels on a diagonal. It equals the offset depth times (cosecant − cotangent) of the angle, about 1/4″ per inch of offset at 30°.
Which angle should I use?
Shallow angles (10° and 22.5°) are easier to pull wire through but need more room between bends. 30° is the most common choice. 45° and 60° fit tight spaces but add more resistance to the pull.
These numbers use the standard multiplier method. Results can differ slightly from your bender's marks, so check the deduct and gain stamped on it.