Multiplier, shrink and run factor
The multiplier is one divided by the sine of the bend angle. Multiply the true offset by it to get the distance between bends. The run factor is one divided by the tangent. The shrink is for each inch of true offset.
| Bend angle | Multiplier (1 / sin) | Shrink per inch of offset | Run factor (1 / tan) |
|---|---|---|---|
| 5° | 11.474 | 0.044 in | 11.430 |
| 10° | 5.759 | 0.087 in | 5.671 |
| 11.25° | 5.126 | 0.098 in | 5.027 |
| 22.5° | 2.613 | 0.199 in | 2.414 |
| 30° | 2.000 | 0.268 in | 1.732 |
| 45° | 1.414 | 0.414 in | 1.000 |
| 60° | 1.155 | 0.577 in | 0.577 |
Distance between bends
True offset in the left column. Read across for the distance between bends, in inches.
| True offset | 10° | 22.5° | 30° | 45° | 60° |
|---|---|---|---|---|---|
| 2" | 11.52 | 5.23 | 4.00 | 2.83 | 2.31 |
| 4" | 23.04 | 10.45 | 8.00 | 5.66 | 4.62 |
| 6" | 34.55 | 15.68 | 12.00 | 8.49 | 6.93 |
| 8" | 46.07 | 20.91 | 16.00 | 11.31 | 9.24 |
| 10" | 57.59 | 26.13 | 20.00 | 14.14 | 11.55 |
| 12" | 69.11 | 31.36 | 24.00 | 16.97 | 13.86 |
| 15" | 86.38 | 39.20 | 30.00 | 21.21 | 17.32 |
| 18" | 103.66 | 47.04 | 36.00 | 25.46 | 20.78 |
| 24" | 138.21 | 62.72 | 48.00 | 33.94 | 27.71 |
How to find the true offset
For a plain offset, the true offset is the rise. For a rolling offset, it is the square root of rise squared plus roll squared. The calculator above does it for you.
A note on rounded values
Field charts often round the multipliers to 5.8, 2.6, 2, 1.4 and 1.2. The chart here shows three decimals. For short offsets the difference is small. For long ones, use the exact value.
Questions
What are the common bender multipliers?
10 degrees: 5.76, 22.5 degrees: 2.61, 30 degrees: 2.00, 45 degrees: 1.41, 60 degrees: 1.15.
How do I find the multiplier for an odd angle?
Divide 1 by the sine of the angle. The custom angle field in the tool does this for you.