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Conduit layout reference
Conduit Bending Chart & Calculator
Use one substantive reference for common offset multipliers, bend spacing and shrink—while keeping bender-specific stub deduct and shoe instructions separate.
Field formula
Distance between equal offset bends = offset depth × multiplier. Total shrink = offset depth × the published shrink factor.
Values below follow Greenlee’s published offset multiplier/shrink table. They are field constants, not a universal stub-up deduct table.
Offset spacing & shrink calculator
Conduit offset multiplier and shrink chart
| Equal bend angle | Field multiplier | Shrink per inch of offset depth | Example: 4" offset spacing |
|---|---|---|---|
| 10° | 6.0 | 1/16" | 24" |
| 15° | 3.86 | 1/8" | 15.44" |
| 22.5° | 2.6 | 3/16" | 10.4" |
| 30° | 2.0 | 1/4" | 8" |
| 45° | 1.4 | 3/8" | 5.6" |
| 60° | 1.2 | 1/2" | 4.8" |
These are the rounded values published by Greenlee for offset layout. Exact trigonometric values differ slightly for some angles; follow the method/reference you are using consistently.
Why multiplier and shrink are two different numbers
The multiplier controls the center-to-center distance between the two equal opposing bend marks. Shrink is the amount by which the conduit’s projected run shortens as the offset is formed. When you are approaching an obstruction, Greenlee’s hydraulic-bender instructions explain that the shrink allowance is used to keep the finished run landing where intended.
For a 4" offset at 30°, the published multiplier gives 8" between bend marks and the 1/4"-per-inch shrink factor gives 1" of total shrink.
Do not mix offset constants with stub deduct
Stub-up deduct depends on the specific hand bender or powered shoe geometry. A generic offset table does not establish the arrow deduct for a 90° stub. Milwaukee, for example, puts size-specific reference marks directly on its hand and powered bending shoes. Greenlee publishes model/shoe instructions for its electric benders.
That is why this page does not publish one universal stub-deduct chart. Use the bender-specific reference for stub-ups and use the table above for the equal-offset method it documents.
Need only a two-bend offset?
The dedicated Conduit Offset Calculator gives a more focused result with mark spacing, shrink and a worked explanation. For power-unit and shoe questions, use the Conduit Bender Guide or Greenlee 555 Shoe Finder.
Need to clear one centered obstruction?
Use the 3-Point Saddle Calculator for Greenlee's published 45° center / 22.5° outer-bend saddle layout, including mark spacing and shrink.
Technical source
- Greenlee — 884 and 885 Hydraulic Benders operator manual — published offset multiplier and shrink table for 10°, 15°, 22-1/2°, 30°, 45° and 60°.
- Milwaukee — EMT hand bender product page — confirms bender-specific offset multipliers and bend-reference markings are provided on the shoe.
Frequently asked questions
What is the multiplier for a 30 degree conduit offset?
The Greenlee field table used here lists a 2.0 multiplier for equal 30-degree opposing bends, so a 4-inch offset uses 8 inches center-to-center between marks.
What is the multiplier for a 22.5 degree offset?
The published Greenlee table used here lists 2.6 for 22.5 degrees.
How do I calculate conduit offset shrink?
Multiply the offset depth by the published shrink-per-unit value for the chosen bend angle. For example, Greenlee lists 1/4 inch of shrink per inch of offset at 30 degrees.
Is stub-up deduct included in the offset multiplier chart?
No. Stub deduct is bender-specific and should come from the markings or documentation for the actual bender. This page intentionally keeps stub deduct separate from equal-offset geometry.