Conduit Bending Calculator

Free conduit bending calculator for electricians and apprentices. Type your numbers, get your marks: measured from the end of the conduit, rounded to the nearest 1/16" (or 1/8"), with a picture of the bend and step-by-step instructions. FAST INPUT • One-tap fraction keys (1/16 to 15/16) and feet-inch entry like 3' 4 1/2" • Results update as you type: no Calculate button • Inches or millimeters, switch any time BENDS • Offset: marks, distance between bends, shrink, first mark from the conduit end • Rolling offset: rise and roll combined into the true offset; set the advance and the angle is chosen for you • 3-point saddle (45° or 60° center) with center-mark shift and side marks • 4-point saddle over beams, ducts and boxes • 90° stub-up with your bender's deduct, and cut length using the gain • Back-to-back 90s • Kicks • Segmented and concentric large-radius bends • Parallel offsets: mark shift for every conduit in the rack SMART CHECKS • Warns when an offset is too small for your bender's radius at that angle • Warns when a mark would fall before the end of the conduit • 360° bend check between pull points (NEC 358.26 style) TOOLS • Phone protractor and level with set-zero and hold • Multiplier and shrink chart: field values and exact trigonometry • Field chart or exact mode, your choice BENDERS • Typical hand-bender presets for 1/2", 3/4", 1" and 1-1/4" EMT and rigid/IMC • Add your own bender with its deduct, radius and gain ALSO • Save results to history, pin the ones you reuse, share them as text • Dark mode for the basement, big numbers for the job site • Works offline, no account, your data stays on your phone Results are guidance for trained electricians. Always check against your own bender and on site, and follow the electrical code that applies to you. Not affiliated with NFPA or any bender manufacturer. Free with ads.

First public release.