EleCalculator

Conduit Bending calculator

Saddle Bend Calculator

For a 3-point saddle, 2 in rise at 45 degree outside bends places the outside marks 2.83 in from center; for a 4-point saddle, 3 in rise over 8 in clear width with the obstacle center at 42 in gives 32 in, 38 in, 46 in, and 52 in marks. Use this saddle bend calculator to lay out 3-point and 4-point conduit saddles from the actual field geometry. Enter the rise you need, the obstacle center distance, and for a 4-point saddle the full width you need to clear across the top.

Updated June 21, 2026

A 3-point saddle with 2 in of rise and 45 degree outside bends places the outside marks 2.83 in from center because 2 x 1.414 = 2.83.

4-point example: 3 in rise at 30 degree over an 8 in clear width -> marks 32, 38, 46, and 52 in when the obstacle center is 42 in from the measured end.

Choose 3-point or 4-point, enter the rise, clear width if needed, and the obstacle center distance to get bend marks and shrinkage.

Calculator Inputs

Quick Presets

Vertical rise needed to clear the obstacle (inches)

Common field angle for the outside bends

Distance from the measured conduit end to the center of the obstacle (inches)

Calculation Results

Enter values above to see calculation results

Field kit

Layout tools for saddle bends

Use the bend marks from the calculator, then compare layout and bending tools for the conduit size in front of you.

Compare conduit bendersMatch conduit type and sizeOpens in a new tabFind angle findersFor bend verificationOpens in a new tabAdd a tape measureFor mark layoutOpens in a new tab

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Calculation history

Example Calculations

3-point saddle at 45 degrees

Two-inch rise centered 24 inches from the measured end.

Inputs
  • Saddle Type: 3-point saddle
  • Obstacle Height: 2
  • Outer Bend Angle: 45 degrees
  • Distance to Obstacle: 24

4-point saddle at 30 degrees

Three-inch rise across an eight-inch clear width centered 42 inches from the measured end.

Inputs
  • Saddle Type: 4-point saddle
  • Obstacle Height: 3
  • Obstacle Width: 8
  • Outer Bend Angle: 30 degrees
  • Distance to Obstacle: 42

How to Use

How this saddle bend calculator works

A saddle bend raises the conduit over an obstacle and returns it to the original run. This page stays focused on the field layout math: mark locations, bend spacing, and shrinkage. It does not pretend that conduit material changes the geometry, so the layout is based on the bend angle and the clearance you need to achieve.

3-point saddle layout

For a 3-point saddle, the center bend is double the outside bend angle. The outside marks sit the same distance on each side of the obstacle center.

Center-to-outside distance = saddle rise x multiplier

Outside bend angle Center bend angle Multiplier Shrinkage per inch of rise
22.5 deg 45 deg 2.613 3/16 in
30 deg 60 deg 2.000 1/4 in
45 deg 90 deg 1.414 3/8 in

4-point saddle layout

A 4-point saddle is two equal offsets wrapped around the obstacle center. The calculator treats the clear width honestly: enter the obstacle width plus any side clearance you want across the flat top section.

  • Mark 1 to Mark 2: first offset pair
  • Mark 2 to Mark 3: flat section over the obstacle
  • Mark 3 to Mark 4: return offset pair

The inside spacing of each offset pair uses the same multiplier math as a standard offset bend. Total shrinkage is doubled because the saddle contains two offsets.

Worked examples

3-point example: 2 in rise at 45 deg, obstacle center at 24 in. The outside marks land 2.83 in on each side of center, so the mark set is 21.17 in, 24.00 in, and 26.83 in.

4-point example: 3 in rise at 30 deg over an 8 in clear width, obstacle center at 42 in. The mark set becomes 32 in, 38 in, 46 in, and 52 in.

Wide 4-point example: 2.5 in rise at 22.5 deg over a 10 in clear width, obstacle center at 60 in. The mark set becomes 48.47 in, 55.00 in, 65.00 in, and 71.53 in.

After the saddle bend result

After the calculator gives the marks, move the result into the field layout workflow before bending the conduit:

  • Saddle Bend Layout Chart to record saddle type, obstacle height, obstacle center, angle set, shrinkage note, bend order, and final mark set.
  • Conduit Shrink Chart to document whether shrink is per outside bend, per offset pair, or already included in the total saddle layout.
  • Offset Bend Multiplier Chart to compare each 4-point saddle offset pair against the selected outside bend angle.
  • Offset Bend Calculator when the field condition changes from obstacle clearance to a simple two-bend offset.
  • Segment Bend Calculator when the route needs a smooth sweep instead of a peaked or flat saddle.

Field checks before bending

  • Measure to the obstacle center, not just the front edge.
  • For a 4-point saddle, include the width you want to clear, not just the bare obstacle width.
  • Keep all bends in the same plane to avoid a dog-leg.
  • If the calculated first mark falls off the conduit, move the saddle farther from the measured end or reduce the rise and width.

Common Applications

Lay out 3-point saddles over single pipes or narrow obstructions

Lay out 4-point saddles over wider ducts, cable trays, or grouped piping

Compare 22.5, 30, and 45 degree field angles before bending

Check saddle shrinkage before cutting or landing a measured piece of conduit

Frequently Asked Questions

When should I use a 3-point saddle instead of a 4-point saddle?
Use a 3-point saddle when the obstacle is narrow and a peaked profile is acceptable. Use a 4-point saddle when you need a flatter section across the top or when the width to clear makes a peaked saddle too abrupt.
Why does the 4-point saddle ask for width to clear?
Because the flat section over the obstacle has to match the space you actually need to carry across the top. If you need side clearance, include it in the width input so the second and third marks land where the field bend really needs them.
Does conduit type change the mark spacing in this calculator?
No. The geometry for mark spacing is driven by bend angle, rise, and clear width. Material and shoe differences may affect how the bend feels in the field, but they do not change the basic layout math shown here.
Why does the calculator reject very short obstacle distances?
Because a mark cannot land behind the measured end of the conduit. If the first mark would go negative, the honest answer is to move the saddle farther from the end or reduce the rise and width.
When should I move the result to a saddle bend layout chart?
Use a layout chart when the bend will be marked in the field, checked by another person, or repeated on parallel conduit runs. The chart keeps the saddle type, angle set, obstacle center, shrinkage note, and final marks in one place.

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