Reference tables
Offset multipliers
The textbook numbers for sharp-cornered bends. Distance between bends = offset height × multiplier; shrink = offset height × shrink per inch. With a bender selected, the calculator works from its radius instead, which gives slightly smaller numbers.
| Angle | Multiplier | Shrink per inch |
|---|---|---|
| 5° | 11.47 | 0.044 |
| 10° | 5.76 | 0.087 |
| 15° | 3.86 | 0.132 |
| 22.5° | 2.61 | 0.199 |
| 30° | 2.00 | 0.268 |
| 45° | 1.41 | 0.414 |
| 60° | 1.15 | 0.577 |
Conduit outside diameters
From the ANSI standards for EMT (C80.3), rigid (C80.1) and IMC (C80.6).
| Size | EMT | RMC | IMC |
|---|---|---|---|
| 1/2" | 0.706"17.9 mm | 0.840"21.3 mm | 0.815"20.7 mm |
| 3/4" | 0.922"23.4 mm | 1.050"26.7 mm | 1.029"26.1 mm |
| 1" | 1.163"29.5 mm | 1.315"33.4 mm | 1.290"32.8 mm |
| 1-1/4" | 1.510"38.4 mm | 1.660"42.2 mm | 1.638"41.6 mm |
| 1-1/2" | 1.740"44.2 mm | 1.900"48.3 mm | 1.883"47.8 mm |
| 2" | 2.197"55.8 mm | 2.375"60.3 mm | 2.360"59.9 mm |
| 2-1/2" | 2.875"73.0 mm | 2.875"73.0 mm | 2.857"72.6 mm |
| 3" | 3.500"88.9 mm | 3.500"88.9 mm | 3.476"88.3 mm |
| 3-1/2" | 4.000"101.6 mm | 4.000"101.6 mm | 3.971"100.9 mm |
| 4" | 4.500"114.3 mm | 4.500"114.3 mm | 4.466"113.4 mm |
| 5" | — | 5.563"141.3 mm | — |
| 6" | — | 6.625"168.3 mm | — |