The calculation, without hidden assumptions
Lay out a two-bend equal-angle conduit offset without mixing in bender-specific stub deduct. Enter offset depth and a published field angle; MAXScanner returns center-to-center bend spacing, shrink allowance and optional mark positions in inches or millimetres.
How to use this calculator
Measure the perpendicular offset depth required.
Choose the equal bend angle you will make in opposite directions.
Use the calculated center-to-center spacing to place the second bend relative to the first.
When working toward an obstruction, apply the reported shrink using the procedure for your bender and layout direction.
Verify shoe markings, springback, minimum radius and project/code requirements before bending.
Where people use it
- •Laying out a 30° offset into a box or around an obstruction.
- •Comparing shallow and steep offset layouts before choosing an angle.
- •Checking whether the required center-to-center spacing fits the available straight run.
- •Converting the same dimensionless field method between inch and metric job measurements.
Example: 6-inch offset at 30°
Greenlee’s published 30° field multiplier is 2.0 and shrink is 1/4 inch per inch of offset depth. Spacing = 6 × 2 = 12 in. Shrink = 6 × 1/4 = 1.5 in.
What the result does not assume
- •This calculator uses published field-table constants rather than silently mixing exact trigonometric shrink with rounded bender-chart values. Follow one method consistently.
- •Stub-up deduct, gain, shoe alignment, ram travel and springback are bender-specific and are intentionally not inferred here.
- •The two bends must be equal and opposite and kept in the same plane; this owner does not model dog-leg correction.
- •Verify conduit type, bender/shoe instructions, minimum bend radius and the total bend allowance between pull points for the actual installation.
- •Metric mode scales dimensions only; multiplier and shrink ratios remain dimensionless.
Frequently asked questions
What is the multiplier for a 30 degree conduit offset?+
The published Greenlee field table uses 2.0, so center-to-center spacing is twice the offset depth.
How much shrink does a 30 degree offset have?+
The published field value is 1/4 unit of shrink per unit of offset depth; a 6-inch offset therefore uses 1.5 inches.
Why not use exact trigonometry for every displayed field value?+
Bender field tables publish rounded multipliers and shrink constants. Mixing exact and field-table values can produce inconsistent marks, so this owner clearly uses the published field method.
Does this calculate stub-up deduct?+
No. Stub deduct and alignment references depend on the actual bender or shoe and should come from its markings or manual.
Can I calculate in millimetres?+
Yes. The constants are ratios, so spacing and shrink scale in the same unit as the entered offset depth.
Does an offset count toward total conduit bend degrees?+
Yes. An equal two-bend offset contributes both bend angles to the run; verify the applicable raceway rules and pull-point layout separately.
Semantic next steps
Continue the calculation
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