App
Conduit Fill & Bend Calculator
NEC Wire Count: EMT, PVC & IMC
Add your conductors and ground and get the conduit fill percentage against the Chapter 9 limit, pass or fail, before you pull. Conduit Fill shows the smallest raceway that works, the jam ratio and the adjustment factor on the same screen.
Every result shows its work: total conductor area, the raceway's area, the allowed percent and the NEC table and note it used, so you can show the inspector the math. Tables are NEC 2023 Chapter 9 (Tables 1, 4, 5 and 8), unchanged since 2017.
FREE, NO LIMITS
• Fill calc for EMT, ENT, FMC, LFMC, IMC, rigid (RMC), PVC 40 and PVC 80, trade sizes ½ to 4 in.
• THHN/THWN-2, XHHW-2, THW/TW, TFN/TFFN fixture wire and bare grounds, with Note 7 rounding for same-size sets
• Conduit sizing: the smallest size that passes, and a one-tap compare across EMT, PVC 40, PVC 80, RMC and IMC
• Wire count by trade size, matching the Annex C tables, with a 60 % nipple toggle
• Jam ratio when three conductors could wedge, and the 310.15(C)(1) adjustment for current-carrying conductors
PRO, ONE-TIME PURCHASE
• Jobs: save every run to a named job, reopen and edit it, and hand the inspector a PDF fill sheet or export CSV
• Cables by OD: add MC, AC, CAT6 or any spec-sheet conductor by its actual outside diameter
• Bending: offsets at 10°, 22½°, 30°, 45° and 60° with distance between bends and shrink, and 3-point saddle marks to the 1/16 in.
Built for electricians at the panel or up a ladder: big numbers, one hand, and your last run is still there when you open it again.
Pro is a one-time in-app purchase, not a subscription. Pay once and keep it. It restores on any device signed in to the same Apple ID.
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