Free Conduit Bending Calculator

Calculator Inputs

Example Data Table

These examples show common field patterns. Always confirm marks with your bender, conduit type, and site conditions.

Formula Used

The calculator uses standard trigonometric relationships for common conduit bends. For offset bends, the multiplier is 1 ÷ sin(angle). Distance between bends is offset height × multiplier. Shrinkage is estimated with offset height × tan(angle ÷ 2).

For stub bends, the main mark is desired stub height − take-up. Gain is estimated with bend radius × tan(angle ÷ 2). For segment bends, arc length is radius × angle in radians. Developed spacing is arc length ÷ segments.

Three bend and four bend saddles use offset geometry. The calculator estimates center marks, outside marks, spacing, and shrinkage. These numbers are planning aids. Real bender shoes, conduit material, spring-back, and job tolerances may require small field adjustments.

How to Use This Calculator

1. Select the bend type that matches your layout.
2. Choose your unit system before entering measurements.
3. Enter height, angle, object distance, take-up, and radius values.
4. Press the calculate button to view marks above the form.
5. Use the CSV or PDF buttons to save the report.
6. Transfer marks to the conduit after checking field clearance.

For best results, measure from the same reference end each time. Keep your tape straight. Mark lightly first. Then verify every bend direction before using the bender.

Advanced Conduit Bending Guide

Why Accurate Bend Marks Matter

Conduit bending looks simple at first. Yet small errors grow fast. A wrong mark can waste pipe. A wrong angle can block a box entry. A wrong shrink value can miss the target line. This calculator helps reduce those problems. It gives clear marks for offsets, stubs, saddles, and segmented bends.

Offset Planning

An offset moves conduit around an object while keeping the run parallel. The height sets the rise. The bend angle controls spacing. A smaller angle gives smoother travel. It also needs more conduit length. A steeper angle uses less room. It can be harder to pull wire through. The calculator shows spacing, travel, shrinkage, and marks.

Stub Up Bends

A stub up bend needs a take-up deduct. This deduct changes with bender type and conduit size. A common hand bender has printed reference values. Enter the value from your tool. The calculator subtracts it from the desired stub height. The result is the mark to place at the arrow.

Saddle Bends

Saddles lift conduit over an obstruction. A three bend saddle is useful for narrow objects. A four bend saddle is better for wider objects. The calculator estimates outside marks and shrinkage. It also keeps the layout easy to read. Leave enough clearance for couplings, straps, and future access.

Segment Bends

Segment bends create a smooth radius from many small bends. They are useful for large sweeps. The tool divides the total angle into equal parts. It also calculates arc length and spacing. Mark each point in order. Bend each segment carefully. Check the curve often against the planned radius.

Field Accuracy Tips

Use the same measurement edge for all marks. Keep the conduit flat before bending. Watch bend direction. Add trim allowance when cuts are uncertain. Test one bend when using a new bender. Real field work includes spring-back and shoe wear. The calculator gives strong planning values, but final fit still depends on careful handling.

FAQs