Box Offset Calculator
Use this focused box-offset workflow when conduit must clear a box or fitting. It keeps the box depth and reference distance visible without assuming a specific bender.
- Box offset depth used
- in
- Distance to box used
- in
- First mark
- in
- Second mark
- in
- Travel between bends
- in
- Estimated shrink
- in
Calculation details
- Offset multiplier
- x
- Calculation basis
- Layout boundary
Recent results
Formulas
- Offset multiplier = 1 / sin(bend angle)
- Travel between bends = box offset depth x offset multiplier
- Second mark = first mark + travel between bends
- Estimated shrink = box offset depth x tan(bend angle / 2)
Use this calculator
Estimate box-offset bend marks, travel, multiplier, and shrink from box depth and bend angle.
Read the result
Review the calculated values with their displayed units and assumptions. The result is a planning aid for the stated inputs, not a final equipment or installation decision.
Check before final work
This box-offset estimate is a field-layout aid. Confirm box dimensions, fitting requirements, bend direction, springback, bender markings, and job conditions before bending.
FAQs
Does distance to box change the offset travel?
The entered distance is shown for layout context. In this simple model, offset travel is determined by box offset depth and bend angle.
Does this include the box fitting take-up?
No. Confirm fitting dimensions, bender take-up, and the field reference convention separately.