Offset Bend Multiplier Chart

Offset multiplier lookup: 22.5 deg = 2.6, 30 deg = 2.0, and 45 deg = 1.414; use this chart after the calculator result to document height, bend spacing, shrink, and marks.

Open calculator

Quick reference table

Offset multiplier answer: 10 deg = 6.0, 22.5 deg = 2.6, 30 deg = 2.0, 45 deg = 1.414, and 60 deg = 1.155. A 4 inch offset at 30 deg uses the 2.0 multiplier, so the marks are 8 inches apart before shrink and bender-reference checks. Use this chart for common offset multiplier questions without creating angle-specific pages.

Offset multiplier and shrink reference

Offset multiplier and shrink reference
Bend angle	Multiplier	Shrink per inch	Field tradeoff
10 deg	6.0	1/16 in	Long layout, gentle bend, good for crowded racks
15 deg	3.9	1/8 in	Gentle bend with moderate layout length
22.5 deg	2.6	3/16 in	Useful when 30 deg is too steep
30 deg	2.0	1/4 in	Fast field math and common bender mark
45 deg	1.414	3/8 in	Compact layout with more shrink
60 deg	1.155	1/2 in	Very short layout, harder to keep clean

What the calculator result should trigger

What the calculator result should trigger
Result item	Field question	Worksheet note
Mark spacing	Is there enough straight conduit before and after the offset?	Record available straight run
Shrink	Does the finished endpoint need to land on a fixed reference?	Add shrink back to the first mark when required
Angle choice	Will the angle fit the obstruction and still look aligned?	Compare 22.5 deg, 30 deg, and 45 deg rows
Bender reference	Arrow, star, or notch used?	Write the actual shoe reference before bending

Offset chart to calculator handoff

Offset chart to calculator handoff
Search or worksheet need	Use this chart for	Open the calculator when
Offset bend multiplier chart	Choosing a bend angle row and checking spacing against available straight run	Offset height, first mark, and second mark need project-specific values
30 degree offset multiplier	Fast-checking the 2.0 multiplier and 1/4 in shrink-per-inch row	The fixed endpoint means spacing and shrink must be recorded together
Offset bend shrink chart	Seeing which angles create more layout loss before marking conduit	The angle changes and all marks need to update from the same input
Parallel or rolling offset	Identifying when a flat offset chart is no longer enough	Roll angle, true offset, or repeated parallel runs must be calculated

Formula basis

Distance between bends = offset height x multiplier. Shrink allowance = offset height x shrink per inch.

Offset height is the rise or drop needed to clear an obstruction or change elevation.
Bend angle is the equal angle used for both bends in the offset.
Multiplier converts offset height into mark spacing along the conduit.
Shrink allowance estimates how much the finished run shortens through the offset geometry.

Worked examples

Clear a 4 inch obstruction with 30 degree bendsDistance between bends = 4 x 2.0 = 8 inches. Shrink = 4 x 1/4 = 1 inch. If the far end must land on a box centerline, record that 1 inch allowance before marking.

Use a gentler offset in a crowded rackA 3 inch offset at 22.5 deg needs 3 x 2.6 = 7.8 inches between bends and about 9/16 inch shrink. It takes more straight run than 30 deg but can be easier to keep parallel with adjacent conduits.

Assumptions. Balanced load and line-to-line voltage assumptions behind this chart.

The chart uses common field multipliers for equal-angle conduit offsets.
Actual alignment still depends on bender shoe reference, conduit type, conduit size, material springback, and measurement reference.
The calculator result should be checked against obstruction clearance, box entry, rack spacing, and the available straight section.

Code and standard notes. Planning limits that should be checked before final equipment selection.

Use this as a field geometry worksheet and verify the final conduit layout with the actual bender, material, supports, and job requirements.

How to use this chart

1Start with measured offset heightUse the calculator result or field measurement to record the actual rise or drop before choosing the bend angle.

2Compare angle tradeoffsPick an angle that fits the available straight run while keeping shrink, bender access, and final alignment visible.

3Transfer marks from one referenceUse one conduit end, obstruction centerline, or box reference consistently so the first and second marks do not drift.

Worksheet checklist. Record source basis, review gaps, and assumptions before using the chart result.

Record angle and multiplierWrite the bend angle, multiplier, shrink-per-inch value, and calculator spacing on the field worksheet.
Record first and second marksDocument first mark, distance between bends, second mark, and whether shrink was added back to the layout.
Record field checksNote conduit type, bender shoe reference, bend direction, obstruction clearance, and any adjustment after test fitting.

Common mistakes to avoid. Review these before turning chart current into an equipment decision.

Using multiplier spacing correctly but forgetting shrink when the finished endpoint must land on a fixed reference.
Changing from 30 deg to 22.5 deg in the field without recalculating spacing, shrink, and second mark location.
Flipping the conduit or bender orientation between bends and creating a dog-leg instead of a clean offset.

Frequently asked questions

These answers explain how to use the chart without turning a quick reference into a final design decision.

Why does the calculator show shrink separately from spacing?

Spacing sets the distance between bend marks. Shrink tells how much the finished run effectively shortens, which matters when a fixed endpoint or box entry must line up.

Which offset angle should I choose?

A shallow angle needs more straight run and usually bends cleaner. A steeper angle saves space but increases shrink, springback sensitivity, and visible alignment errors.

When should I avoid a steep offset?

Avoid steep offsets when the conduit must stay parallel with other runs, when there is limited room for the bender shoe, or when the landing point is tight.

When should I open the offset bend calculator from this chart?

Open the calculator when the offset height, chosen angle, fixed endpoint, and first-mark reference all need to produce one traceable mark layout.