Input Parameters
About This Calculator
- Distance between marks = offset × bend multiplier
- Multipliers: 10°=5.76, 22.5°=2.61, 30°=2.00, 45°=1.41, 60°=1.15
- Shrink = offset × tan(angle/2); the same geometry applies to EMT and PVC conduit
How this conduit offset calculator works
A conduit offset uses two identical bends to shift EMT or PVC around an obstacle. Distance between marks = offset height ÷ sin(angle); the multiplier is the reciprocal of sin(angle).
Shrink accounts for the conduit shortening: shrink = offset × tan(angle/2). Add the shrink allowance when laying out the first mark, then verify the bend manufacturer’s take-up and minimum radius.
FAQ
What is a conduit offset?
Two bends shift EMT, PVC, or another conduit around an obstacle while keeping the run parallel.
What is the conduit offset formula?
Distance between marks = offset ÷ sin(angle). A 30° conduit offset uses a 2.00 multiplier; a 45° offset uses 1.41.
How much shrink does an offset bend have?
Use offset × tan(angle/2). At 30°, shrink is about 0.289 times the offset height.