Find the conduit offset multiplier for any bend angle, from 10° and 22.5° to 30°, 45° and 60°, then get bend spacing, shrink or offset depth.
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Offset Multiplier Formula
The offset multiplier is used to convert a desired offset into the travel needed to form that offset with two equal bends. In conduit, pipe, and tubing layout, the travel is the sloped centerline distance between the bends.
If you already know the travel or need to solve for the multiplier, the same relationship can be rearranged as follows:
- T = travel distance
- O = offset distance
- M = offset multiplier
The multiplier is unitless, so the offset and travel can be entered in inches, feet, millimeters, or centimeters as long as both values use the same unit.
How the Multiplier Relates to Bend Angle
For a standard equal-offset layout, the multiplier comes from the bend angle. Geometrically, the travel is the hypotenuse of a right triangle and the offset is the side opposite the bend angle.
This is why smaller bend angles require more travel, while larger bend angles require less travel.
How to Use the Calculator
- Choose the solve target. Enter the required perpendicular offset, bend-reference spacing or equal bend angle.
- For forward spacing/offset solves, select a common angle, a custom angle strictly between 0° and 90°, or a known multiplier greater than 1.
- Find the correct multiplier for that angle, or enter the multiplier directly if it is already known.
- Calculate the travel to determine the spacing needed for the offset section.
- If mark positions are needed, enter an already established first reference mark. The second equals the first plus spacing. Follow your bender manufacturer’s mark, minimum-spacing, shrink and take-up rules.
Common Offset Multipliers by Angle
| Bend Angle | Multiplier | Typical Rounded Field Value |
|---|---|---|
| 10° | 5.7588 | 5.8 |
| 22.5° | 2.6131 | 2.6 |
| 30° | 2.0000 | 2.0 |
| 45° | 1.4142 | 1.4 |
| 60° | 1.1547 | 1.2 |
If precision matters, use the full decimal multiplier instead of the rounded field value.
Examples
6-inch offset with 30° bends: use a multiplier of 2.0, so the travel is 12 inches.
8-inch offset with 45° bends: use a multiplier of 1.4142, so the travel is about 11.31 inches.
4-inch offset with 22.5° bends: use a multiplier of 2.6131, so the travel is about 10.45 inches.
Practical Notes
- These are ideal same-plane equal-angle offset formulas. They do not include finite bend radius or springback. Geometric shrink is offset × tan(angle / 2), which can differ from a bender’s rounded field shrink allowance.
- Do not mix units. If the offset is entered in inches, the travel returned will also be in inches.
- The multiplier only changes when the bend angle changes.
- Lower angles create smoother offsets but require more run length.
- Higher angles reduce travel but may be less desirable depending on space, bend radius, and installation standards.
Common Mistakes
- Using the wrong multiplier for the chosen bend angle.
- Confusing offset distance with travel distance.
- Rounding the multiplier too aggressively on tight-tolerance work.
- Applying the formula to unequal bends, where this simple relationship does not apply directly.
This calculator is most useful when you know any two of the three values: offset, travel, or multiplier. Enter the known values, and it quickly solves for the missing one so your layout is faster and more consistent.
