Conduit layout tool
4 Point Saddle Bend Calculator
Lay out four bend marks for a conduit saddle that clears a wider obstacle while keeping a flat section over the obstruction.
Calculate a 4 Point Saddle Bend
Calculate four saddle bend marks from obstacle height, obstacle width, bend angle, and measured distance to the obstacle center.
Calculator Inputs
Calculation Results
Enter values above to see calculation results
Result notes
Keep the entered values, assumptions, and result together when adding this calculation to job notes or submittal records. Final installation choices should align with the applicable code edition, equipment listing, manufacturer instructions, local amendments, and AHJ requirements.
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Saddle Bend Calculator
Calculate 3-point and 4-point saddle bend marks for conduit runs over obstacles.
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Concentric Bend Spacing Calculator
Calculate centerline spacing for concentric conduit bends and parallel raceway layout checks.
Related charts
Saddle Bend Layout Chart
Use this 3 point saddle bend chart: 2 in obstruction at 45 deg marks 2.83 in each side; compare 4-point layout for wide trays.
Conduit Shrink Chart
Use a conduit shrink chart to compare bend angle, offset height, true offset, shrink per inch, and layout allowance after a calculator result.
Segment Bend Layout Chart
Use a segment bend layout chart to document total angle, bend count, centerline radius, bend angle per mark, chord spacing, and field stations.
Related guides
Conduit Fill Guide | 4 #6 THHN = 38.1%
Use conduit fill calculator example: 4 #6 THHN in 3/4 EMT uses 38.1%; compare NEC 40% fill, conductor count and ampacity derating.
Conduit Fill Table | 3/4 EMT #12, #10 and #6
Use this conduit fill table: 3/4 EMT fits 16 #12, 10 #10, 5 #8, or 4 #6 THHN at 40%; compare EMT, RMC and PVC sizes.
Formula and field context
Lay out four bend marks for a conduit saddle that clears a wider obstacle while keeping a flat section over the obstruction.
Formula context
Saddle Bend Layout Chart
The 3-point saddle bend formula is outside spacing = obstruction height x multiplier: a 2 in obstruction at 45 deg uses 2 x 1.414 = 2.83 in on each side of the center mark. A 4-point saddle uses two matching offsets with a flat section over the obstruction width. Use this chart to keep centerline, edge clearance, shrink, and bend sequence tied to the calculator result before transferring marks to conduit.
Formula
3-point outside spacing = obstruction height x multiplier. 4-point layout = clear width plus matching offset spacing on each side.Variables to keep with the result
- Obstruction height is the vertical clearance needed above the obstruction.
- Obstruction center is the measured reference used for a 3-point center mark.
- Obstruction width plus side clearance sets the flat section for a 4-point saddle.
- Shrink allowance is added back when the finished conduit endpoint must land on a fixed reference.
Use for wider obstacles
A 4-point saddle uses two offset pairs and a flat section, useful when conduit needs to pass over a wider obstruction.
Field layout still needs judgment
Check bender markings, conduit size, couplings, box locations, and available straight length before marking the run.