Last Updated: March 23, 2026
What You’ll Need
- Conduit bender (1/2″, 3/4″, or 1″ to match your conduit size)
- EMT conduit (or rigid conduit)
- Tape measure
- Permanent marker
- Conduit cutter or hacksaw
- Deburring tool or file
Safety Precautions
- Work on de-energized systems: Even when running new conduit, confirm existing circuits in the area are off before drilling, anchoring, or cutting near existing wiring
- Wear gloves: Fresh-cut conduit ends are sharp. Deburr all cut ends before handling
- Support the conduit: Long conduit sections can whip unexpectedly when the bend is released. Keep a firm grip through the complete bend
- Check local electrical code: Number of bends allowed per conduit run, minimum bend radius, and fill capacity are regulated by NEC and local codes
Understanding Your Conduit Bender
Key Markings on the Bender Head
- Arrow (→): The main reference mark. Used to align the conduit for 90-degree bends. Place the conduit mark at the arrow to hit your stub height.
- Star (✦) or “Gain” mark: Used to account for the shrink (gain) when making 90-degree bends. Moves the mark forward by the gain value (typically 5″ for 1/2″ EMT).
- Degree markings (10°, 22.5°, 30°, 45°, 60°, 90°): Guide lines on the bender head for making specific bend angles.
- Back of bend: The flat area on the bender head used to reference saddle bends.
Gain / Shrink
When you bend conduit 90°, the arc of the bend consumes some length that you’d otherwise count as straight conduit — this is called gain (or shrink). For 1/2″ EMT, gain is approximately 5″. This means if you need a 12″ stub-up, mark the conduit at 12″ minus 5″ = 7″ from the end and align that mark to the bender arrow.
Step-by-Step: 90-Degree Stub-Up Bend
Measure the stub height needed
Determine how high the conduit needs to rise (the “stub”). For example, 12 inches above the floor to a junction box.
Calculate the mark location
Subtract the bender’s gain from the stub height. For 1/2″ EMT with a Klein or Greenlee bender, gain = 5″. So for a 12″ stub: mark the conduit at 12″ – 5″ = 7″ from the end.
Mark the conduit
Measure 7″ from the end of the conduit and make a clear mark with a permanent marker, going all the way around the conduit for easy visibility.
Position the conduit in the bender
Insert the conduit into the bender with the mark aligned to the bender’s arrow reference mark. The conduit should sit firmly in the bender’s hook with the end facing up.
Apply the bend
Place one foot on the bender footpad to stabilize it. Apply steady downward force on the bender handle while maintaining light inward pressure to keep the conduit from rolling in the hook. Watch the degree indicator and stop at 90°. Conduit springs back slightly, so bend to about 92–93° and allow it to spring back to 90°.
Check the angle
Use a square or level to check the angle. The stub should be perfectly vertical and the run horizontal. Adjust if needed — small corrections can be made by hand.
Step-by-Step: Offset Bend
An offset lets conduit navigate a change in elevation — such as going from a wall surface to a surface that’s 2″ deeper. Two equal bends in opposite directions create a parallel offset.
Determine the offset rise
Measure how much the conduit needs to shift — for example, 2 inches around a structural beam.
Calculate mark spacing for your bend angle
Use the offset multiplier: For 30° bends, spacing = offset rise × 2.0. For 22.5° bends, spacing = offset rise × 2.6. For a 2″ offset using 30° bends: spacing = 2″ × 2.0 = 4 inches between marks.
Mark two points on the conduit
Make the first mark at your starting point, the second mark 4″ further along the conduit.
Bend the first mark to 30°
Align the first mark to the bender arrow, bend to 30°.
Rotate conduit 180° and bend the second mark
Flip the conduit 180° in the bender (so the first bend goes the other way), align the second mark to the arrow, and bend to 30°. The two bends should be parallel — hold the bent section up and check that both bends match.
Step-by-Step: Three-Point Saddle Bend
A saddle bend routes conduit over a pipe or beam that crosses your run. Three bends create a saddle shape that straddles the obstacle.
Mark the center of the obstacle
Measure to the center of the pipe or beam you’re crossing and mark the conduit at that point.
Calculate mark spacing
For the common 45°/22.5°/22.5° saddle: place two additional marks, one on each side of center. Spacing = obstacle height × 2.5 (for 22.5° side bends).
Bend center mark to 45°
Align the center mark to the bender arrow, bend to 45°.
Bend outer marks to 22.5°
Flip conduit and bend each outer mark to 22.5°, rolling the conduit 180° between each bend so the outer bends oppose the center bend.
Pro Tips for Better Bends
- Mark all the way around the conduit: You can’t see the mark on the bottom of the conduit when it’s in the bender. A circumferential mark ensures you align correctly
- Practice on scrap: Each bender brand has slightly different gain values and feel. Run a few practice bends on scrap EMT before cutting your final conduit run
- Lightly oil the bender shoe: A tiny amount of pipe-bending lubricant prevents the conduit from grinding in the bender hook and keeps bends smoother
- Keep consistent foot pressure: Your foot on the footpad prevents the bender from rocking and keeps the bend angle consistent
- Check the bend immediately after each step: Corrections are easier before cutting the conduit to final length
Common Mistakes
- Dog-leg (twisted) bends: Happens when the conduit rolls in the bender during the bend. Keep constant inward pressure during the stroke to prevent this
- Forgetting to subtract gain: If you mark for a 12″ stub without subtracting gain, your stub will be 5″ too long. Always apply the gain formula
- Kinking: Applying too much force too quickly or using a bender that’s too small for the conduit size creates a kink at the bend. Smooth, steady pressure prevents kinking
- Under-bending and trying to re-bend: It’s nearly impossible to add to a bend once the conduit is removed. Bend to 92-93° to account for spring-back and get the right final angle
Frequently Asked Questions
What’s the gain value for different conduit sizes?
Approximate gain values: 1/2″ EMT = 5″, 3/4″ EMT = 6″, 1″ EMT = 8″. These values are printed on most benders and in their accompanying instructions. Always check your specific bender’s documentation.
Can I use the same bender for EMT and rigid conduit?
No. EMT (electrical metallic tubing) and rigid conduit have different wall thicknesses and require benders designed for each type. Using an EMT bender on rigid conduit produces poor bends. Buy benders matched to the conduit type you’re using.
What’s the maximum number of bends allowed in one conduit run?
NEC 358.26 limits EMT conduit runs between pull points to 360° total of bends (four 90° bends). Exceeding this makes wire pulling nearly impossible and exceeds code requirements.
Do I need a mechanical advantage bender for larger conduit?
Hand benders work well for 1/2″ through 1″ EMT. For 1-1/4″ EMT and larger, or for rigid conduit, a mechanical (Chicago-style) bender or hydraulic bender is needed — hand benders don’t have enough leverage for larger pipe.
How do I fix a conduit that I bent too far?
Carefully place the overbent section against the bender (or a sturdy flat surface) and apply slight reverse pressure. Small corrections work; large corrections weaken the conduit wall. For major errors, cut the bad section out and use a coupling.
Conclusion
Conduit bending is a learnable skill that comes with practice. Master the 90-degree stub-up first — it teaches the arrow reference, gain calculation, and spring-back compensation. Once you can hit consistent 90° stubs, offsets and saddles follow the same principles applied twice or three times in sequence. Invest in a quality bender (Klein, Greenlee, Ideal), practice on scrap conduit, and you’ll be running clean conduit on your first real job.
