Conduit Bend Calculator

Every conduit bend comes down to two numbers: a multiplier and a shrink. For a two-bend offset, the distance between the bends equals the offset depth times the multiplier, the cosecant of the bend angle (1 ÷ sin θ). That gives the familiar field values: 6 at 10°, 2.6 at 22.5°, 2 at 30°, 1.4 at 45°, and 1.2 at 60°. The 30° bend is the everyday favorite because its ×2 multiplier and ¼-inch-per-inch shrink are trivial to do in your head. Shrink is how much the run shortens as it rises over the obstacle, exactly tan(θ/2) per inch of offset, so you add it to your measurement to keep the run from coming up short.

This calculator covers the three bends you make most: the offset, the 90° stub-up, and the three-bend saddle. For a stub-up, it subtracts the bender take-up (5" for ½" EMT, 6" for ¾", 8" for 1", 11" for 1¼") from your finished height to place the mark, and lets you override with a measured deduct, since take-up varies by bender. For a saddle over a pipe, it uses the 45°-center / 22.5°-outer standard (2.5× multiplier, 3/16" shrink per inch) to place the center and outer marks. Toggle between field-chart constants and exact trig, and read every result to the nearest 1/16" the way you would off a tape measure. Pair it with the wire size and voltage drop calculators to take a run from layout to code-compliant install.