Conduit Bending Calculator
Get precise measurements for bending pipe around any obstacle.
1SELECT BEND TYPE
2ENTER MEASUREMENTS
Steps
- 01
Measure Distance
Measure distance to obstruction (e.g. 40"). Add Shrink 3 3/16" to find the Far Mark.
- 02
Mark Travel
Measure back the Travel distance 24" from the Far Mark to find the Near Mark.
- 03
Bend Sequence
Align arrow to Near Mark, bend 30°. FLIP PIPE 180°. Align arrow to Far Mark, bend 30°.
Popular conduit Configurations
Offset Multiplier Formula
Where D is distance, O is offset depth, and M is the multiplier.
NEC Conduit Bending Rules
NEC Article 358.26 states that there shall not be more than the equivalent of four quarter bends (360 degrees total) between pull points, for example, conduit bodies and boxes.
Frequently Asked Questions
What is the multiplier for a 30 degree offset?
The multiplier for a 30-degree bend is 2. This means for every 1 inch of offset, you measure 2 inches between your marks.
How do I calculate shrink?
Shrink is the amount of length "lost" in the bend. For a 30° bend, the shrink is 1/4" per inch of offset depth.
What is the maximum number of bends allowed?
The NEC allows a maximum of 360 degrees of bends (e.g., four 90° bends) between pull points.