Conduit Bending Calculator (Offset, Saddle, Stub-Up)
Get the mark-to-mark distance and shrink for an offset at 10, 22.5, 30, 45 or 60 degrees, the marks for a 3-bend saddle, or the take-up for a 90° stub-up.
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The math
- Offset: distance between bends = height ÷ sin(angle). A 30° bend multiplies height by 2. Shrink = height × tan(angle ÷ 2), roughly 1/4 in. per inch of rise at 30°.
- 3-bend saddle: a center 45° bend flanked by two 22.5° bends. Mark the center, then measure out 2.5 × height on each side. Shrink is about 3/16 in. per inch of height.
- Stub-up: subtract the bender take-up from the stub-up height to get the mark. Take-up is printed on the bender (about 5 in. for 1/2 in. EMT).
Worked example
A 6-inch offset with 30° bends needs bends spaced 6 ÷ 0.5 = 12 inches apart, and the conduit shrinks about 1.6 inches.
Frequently asked questions
Which angle should I use?
30° is the most common: it is easy to mark (multiplier 2) and keeps pulling friction low. Use 10° or 22.5° for gentle offsets and 45° or 60° when space is tight.
Do I need to add shrink?
Yes. Offsets shorten the conduit, so add the shrink to your overall length if the end position is critical.
Related calculators
This calculator gives an estimate for planning and is not tax, legal or engineering advice. Confirm code-related results against the code edition adopted in your jurisdiction and with your authority having jurisdiction, and follow the manufacturer's instructions.