Offset Bending Multipliers

An offset bend consists of two equal bends in opposite directions to move the conduit around an obstacle. The multiplier tells you the distance between bend marks based on your offset depth and bend angle. The shrink constant tells you how much shorter the conduit becomes because of the bends — you need to add this to your overall measurement.

Geometric diagram of a conduit offset showing offset depth, bend angle, the distance between bend marks and the resulting shrink
The offset triangle. Multiplier sets the distance between marks; shrink sets how much length you lose.
Bend AngleMultiplierShrink per Inch of Offset
10°6.01/16"
22.5°2.63/16"
30°2.01/4"
45°1.4143/8"
60°1.1551/2"
Distance Between Marks = Offset Depth × Multiplier
Offset Bend Formula

Example: You need a 4-inch offset using 30° bends. Distance between marks = 4 × 2.0 = 8 inches. Shrink = 4 × 1/4" = 1 inch. Add 1 inch to your starting measurement to compensate.

Pro tip: 30° bends at a 2.0 multiplier are the most commonly used offset angle because the math is simple and the bends look clean. Use 45° when space is tight and you need a sharper offset.

FRACTIONS, NOT DECIMALS

The app's bending calculator works in sixteenths, because that is what your tape reads.

90-Degree Stub-Ups

A stub-up is the most basic bend. You're bending the conduit 90° to go from horizontal to vertical (or vice versa). The key measurement is the take-up — how much of the conduit the bender "uses" to create the bend.

EMT SizeTake-UpDeduct
1/2"5"5"
3/4"6"6"
1"8"8"
1-1/4"11"11"

How to use it: If you need a 12-inch stub using 1/2" EMT, mark the conduit at 12" - 5" = 7 inches from the end. Place the bender arrow on that mark and bend to 90°.

Three-Point Saddle Bends

A saddle bend goes over an obstacle (like another pipe) and comes back to the original plane. It uses three bends: a center bend and two equal outer bends.

Standard Method: 45° Center, 22.5° Outers

  • Mark the center of the obstacle on the conduit
  • Measure the depth of the saddle (how high the obstacle is)
  • Multiply the depth by 2.6 to get the distance from center mark to each outer mark
  • Bend the center mark to 45°
  • Flip the conduit and bend each outer mark to 22.5°
  • Shrink: multiply depth by 3/16" per inch

Alternative: 60° Center, 30° Outers

  • Distance from center to outers: depth × 2.0
  • Center bend: 60°
  • Outer bends: 30° each
  • Shrink: multiply depth by 1/4" per inch

Pro tip: For small obstacles (under 2 inches), use the 45°/22.5° method. For larger obstacles, the 60°/30° method gives you a tighter saddle that looks more professional.

Back-to-Back 90s

Back-to-back bends create a U-shape. Measure the distance between the two legs (outside to outside), subtract the gain for your conduit size, mark the conduit, and bend.

EMT SizeGain (per 90° bend)
1/2"3"
3/4"3-3/4"
1"4-1/2"
1-1/4"5-3/4"

Kicks (Partial 90s)

A kick is a single bend less than 90° used to angle conduit into a box or transition between surfaces. The approach is similar to a stub-up but you're bending to a smaller angle. Use the travel and setback method or simply eyeball it for small kicks (10-15°) — experienced electricians often do this by feel for minor adjustments.

Key Rules to Remember

  • Never exceed 360° of total bends between pull points (NEC requirement)
  • Always account for shrink on offsets and saddles — it's the most common mistake
  • Mark your conduit with a pencil, not a marker — marker lines are hard to see under jobsite lighting
  • The arrow on the bender marks different things depending on the bend type — check your bender's instructions
  • Anti-dog (aligning multiple conduit runs) requires consistent technique — bend one stick, use it as a template for the rest

Pricing the job as well as bending it? Tradesman Office builds estimating and labor-rate tools for contractors that pair well with a cheat sheet like this one.

BENDING CALCULATOR IN YOUR POCKET

Offsets, saddles, kicks and stubs in fractional inches. Free tier, works offline.

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Frequently asked questions

What is the multiplier for a 30 degree offset?
Two. Multiply the offset depth by 2 to get the distance between your two bend marks. Thirty degrees is the most-used offset angle in the trade precisely because the math is that clean.
What is shrink and why does it matter?
Shrink is the length the conduit effectively loses along its run because the offset routes it diagonally. If you ignore it, your stub comes up short of the box. Add the shrink amount to your measurement before you make the first bend.
Do the same multipliers work for rigid and EMT?
The trigonometry is identical, so the multipliers are the same. What differs is the bender's take-up and the radius of the shoe, so your gain and stub-up figures change with the tool and the conduit size, not with the formula.
What angle should I use when space is tight?
Go steeper. A 45 degree offset covers the same depth in less run than a 30, at the cost of more shrink and a harder pull. For very tight obstacles, the 45 over 22.5 saddle method keeps the geometry manageable.

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// DisclaimerThe National Electrical Code® (NEC®) and NFPA 70® are registered trademarks and copyrighted publications of the National Fire Protection Association (NFPA). This article is an independent educational resource and is not affiliated with, endorsed by, or sponsored by the NFPA. All code references in this article are paraphrased for educational purposes only and do not reproduce the official text of any NEC edition. This content is not a substitute for the official NFPA 70 publication. Electricians, contractors, and students are encouraged to purchase the official National Electrical Code from the NFPA at nfpa.org for complete and authoritative code text. Always verify requirements with the code edition adopted by your jurisdiction and your Authority Having Jurisdiction (AHJ).