Conduit Bending Calculator Online

Calculator Inputs

Bend type

Unit

Conduit size

Reference distance

Offset or saddle height

Roll amount

Obstruction width

Bend angle

Desired stub height

Take up

Enter 0 to use the built-in estimate.

Bend radius

Waste allowance

Total segment bend angle

Segment count

Use Example Values

Example Data Table

Bend type	Height	Angle	Width or roll	Typical use
Offset bend	6 in	30 degrees	0 in	Move conduit over a low obstruction.
Rolling offset	6 in	30 degrees	4 in roll	Move conduit upward and sideways.
Three bend saddle	4 in	45 degrees center	Small obstruction	Clear a narrow pipe or support.
Four bend saddle	8 in	30 degrees	14 in width	Clear a wide obstruction cleanly.

Formula Used

Offset Bend

Multiplier = 1 / sin(angle). Distance between bends = offset height × multiplier. Shrink = offset height × tan(angle / 2).

Rolling Offset

True offset = square root of vertical offset squared plus roll squared. Bend spacing = true offset / sin(angle).

Three Bend Saddle

Outer bend angle = center angle / 2. Outside mark spacing = saddle height / sin(outer bend angle).

Four Bend Saddle

Offset spacing = saddle height / sin(angle). Total shrink estimate = 2 × saddle height × tan(angle / 2).

Stub Up

Bend mark = desired stub height minus take up. Bend gain estimate = 2 × radius × tan(angle / 2) minus arc length.

Segment Bend

Angle per segment = total bend angle / segment count. Arc spacing = radius × total angle in radians / segment count.

How to Use This Calculator

Select the bend type that matches your conduit layout.
Choose inches or centimeters.
Enter the distance from your reference point.
Add the offset height, roll, saddle width, or stub height.
Enter the bend angle and bend radius.
Use 0 take up for an estimated value.
Press calculate to show the result above the form.
Download CSV or PDF results for job records.

Conduit Bending Planning Guide

Good conduit bending starts before the bender touches metal. A clean layout saves material, time, and rework. This calculator helps convert common field measurements into bend marks. It supports offsets, rolling offsets, saddles, stub ups, and segmented bends. You can compare angles and see how each choice changes travel, shrink, and spacing.

Why Bend Math Matters

Every bend changes the straight length of conduit. Offset bends need a multiplier. Saddles need center marks and outside marks. Stub bends need take up. Segment bends need equal mark spacing. Small errors can move a box connection, miss a strut line, or place the conduit too close to an obstruction. Using formulas gives repeatable results.

Field Use and Checking

Measure from a fixed reference point. Keep the same unit for every input. Enter the rise, roll, obstruction width, bend angle, radius, and take up. The result area shows the main marks in order. It also lists shrink, gain, travel, and estimated cut length. Before bending, compare the take up value with the number printed on your actual bender.

Choosing an Angle

A shallow angle gives a longer travel distance. It usually looks smoother and pulls wire easier. A steep angle needs less straight space, but it adds sharper direction change. Many field offsets use 10, 22.5, 30, or 45 degrees. Saddles often use paired bends with a center bend. This page lets you test those choices quickly.

Limitations and Safety

This tool provides layout math. It cannot inspect wall thickness, tool wear, conduit springback, or local electrical rules. Real benders vary by brand and trade practice. Always verify marks on scrap when accuracy matters. Follow site standards, bend limits, and code requirements. Use proper personal protective equipment while cutting and bending conduit.

Better Results

Write each mark on the conduit clearly. Mark the bend direction, not only the distance. Keep the conduit flat in the bender. Make bends in the correct order. Recheck obstruction height after the first bend. Store printed or downloaded results with the job notes for future runs.

Downloads and Documentation

Use CSV records for spreadsheets. Use PDF reports when sharing marks with helpers, estimators, or supervisors before cutting conduit on busy sites each morning.

FAQs

What does this conduit bending calculator find?

It finds bend marks, offset spacing, shrink, gain, travel, saddle marks, stub marks, and segment bend spacing. The exact output depends on the bend type selected.

Which unit should I use?

Use the same unit used on your tape measure. The calculator supports inches and centimeters. Do not mix units in one calculation.

What is shrink in conduit bending?

Shrink is the amount a bend layout pulls back from the planned reference point. Offset and saddle bends need shrink correction for better placement.

What is the offset multiplier?

The offset multiplier converts a required rise into distance between bends. It equals 1 divided by the sine of the bend angle.

Can I calculate rolling offsets?

Yes. Enter the vertical offset and roll amount. The calculator finds the true rolling offset, bend spacing, shrink, and rotation guide angle.

What take up value should I enter?

Use the value printed on your bender when possible. Enter 0 only when you want the calculator to use its built-in estimate.

Does this replace field testing?

No. It provides layout math. Always check tool markings, conduit springback, job rules, and local code requirements before final installation.

Why use CSV or PDF downloads?

CSV files help with spreadsheets and records. PDF files are useful for printing, sharing bend marks, and keeping job notes with layout details.