Conduit Bending calculator
Segment Bend Calculator
A 90° segmented conduit bend split into 6 equal bends at a 24 in radius gives 15° per bend, about 6.283 in of smooth-arc station spacing, and about 6.265 in of straight chord step. This page is a geometry screen for equal-angle segmented conduit bends. It returns the bend angle for each station, a smooth-arc reference spacing, the straight chord step between equal-angle stations, and optional bend-mark stations from a first-mark reference. It does not claim NEC minimum-radius compliance, conduit-material approval, or bender-specific take-up rules.
Updated June 21, 2026
A 90 degree segmented bend laid out as 6 equal bends at a 24 in radius screens at 15 degrees per bend, about 6.283 in of smooth-arc station spacing, and about 6.265 in of straight chord step between bend stations.
Equal-angle screen: 90° ÷ 6 = 15° per bend | chord step = 2 × R × sin(θ/2) = 2 × 24 × sin(7.5°) ≈ 6.265 in
Enter total angle, number of equal bends, target radius, and an optional first-mark distance to get bend angle, spacing references, and bend-mark stations
Calculator Inputs
Calculation Results
Enter values above to see calculation results
Example Calculations
90° segmented bend at 24 in radius
Six equal bends with the first bend mark measured 12 in from the conduit end.
- Total Bend Angle: 90
- Number of Segments: 6
- Bend Radius: 24
- First Mark Distance: 12
45° segmented bend at 18 in radius
Three equal bends with relative stations starting at Mark 1 = 0.
- Total Bend Angle: 45
- Number of Segments: 3
- Bend Radius: 18
How to Use
How to use the segment bend calculator
- Enter the total bend angle you need through the segmented section.
- Enter the number of equal bends you plan to make.
- Enter the target centerline radius for the finished curve.
- Optionally enter the distance to the first bend mark if you want absolute stations from a measured end.
- Review the angle per bend, the smooth-arc station spacing, the straight chord step, and the listed bend-mark stations.
What the outputs mean
| Output | Meaning | Why it helps |
|---|---|---|
| Angle per bend | Total angle divided into equal bends | Keeps each bend consistent through the segmented section |
| Smooth-arc station spacing | Reference spacing along the target smooth centerline arc | Useful as a clean geometry reference before field adjustments |
| Straight chord step | Straight-line distance between equal-angle stations on the target curve geometry | Useful when you want a simple station-to-station layout reference |
| Bend-mark stations | Cumulative stations from Mark 1 or from the entered first-mark distance | Helps you lay out repeatable marks instead of redoing the spacing by hand |
Important scope notes
- This page is a geometry-only screen for equal-angle layout.
- It does not determine NEC minimum bend radius, conduit-material compliance, or one-shot bender suitability.
- Actual field results still depend on the bender shoe, conduit stiffness, spring-back, and the finish you are trying to match.
- If you are laying out multiple parallel runs, keep the angle per bend consistent and recheck the radius geometry for each run.
Example: a 90° segmented bend laid out as 6 equal bends at a 24 in centerline radius gives 15° per bend, about 6.283 in of smooth-arc station spacing, and about 6.265 in of straight chord step between stations.
After the segment bend result
- Open the Segment Bend Layout Chart to document total angle, bend count, angle per bend, chord step, arc reference, and mark stations.
- Use the Concentric Bend Spacing Chart when several parallel conduits need matching radius, spacing, and mark-offset notes.
- Use the Saddle Bend Layout Chart when the route changes from a smooth curve to obstacle clearance marks.
Use the Saddle Bend Calculator for obstacle saddles, the Offset Bend Calculator for standard offsets, the Kick Bend Calculator for single kicks, and the Concentric Bend Spacing Calculator when you are comparing multiple parallel radii.
Common Applications
Planning equal-angle segmented bends for exposed conduit runs
Comparing different bend counts before laying out a large-radius change in direction
Generating repeatable bend-mark stations from a first measured mark
Checking how the straight chord step compares with the smooth-arc reference spacing
Supporting concentric-run layout discussions without pretending to be a code-compliance tool
Frequently Asked Questions
What does this segment bend calculator actually calculate?
Why does the page show both smooth-arc spacing and straight chord step?
Does this page tell me the NEC minimum bend radius?
Can I use the same angle per bend for concentric runs?
What should I do if the field finish does not match the exact screen result?
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