Conduit bending calculators
Conduit bending math, one page per bend. Start with the offset — or, if you are new to it, start from zero →
Conduit offset calculator
Enter the height you need to clear and your bend angle. The marks and the shrink update as you type, the diagram redraws with them, and the "Do it" list under the number is what to do at the bender. Every other bend has its own page below.
Your most-used
Every bend, one page each
- Conduit offset Rise and angle to the distance between marks and shrink.
- Three-point saddle Clear a round obstruction: centre and outer marks.
- Four-point saddle Clear a flat obstruction with two offsets.
- 90° stub-up Height and take-up to the mark from the end.
- Rolled offset Rise and roll to the true offset and roll angle.
- Conduit shrink The length an offset pulls out of the run.
- Back-to-back bend Two 90s a set distance apart, as a squared U.
- Kick 90 A 90 stub with a kick in the tail to lift the run.
- Box offset The small step that seats a connector in a knockout.
- Parallel offsets Keep a rack of conduits even through the jog.
- Segmented bend A large-radius sweep from many small bends.
- Concentric bends Parallel runs kept even around a corner.
- Bending multipliers Every angle: exact multiplier and the shop rule.
- Bender take-up Find your own take-up from a test bend.
Guides and reference
- Bending, from zero Six short lessons for a first-week apprentice, each with a drill.
- How to bend conduit The guide, in the order you learn the bends, as procedures.
- Conduit bending formulas Every formula on the site, from one triangle.
- Tape measure fractions Decimals to sixteenths, and a drill that keeps going.
- Conduit bending glossary Shrink, gain, take-up and the rest defined.
A bend a month
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