Wire fill calculator. Calculate conduit fill percentages and wire cap...

Wire fill calculator. Calculate conduit fill percentages and wire capacity per NEC requirements. Free calculator for EMT, PVC, and RMC conduit sizing with wire area calculations. Feb 25, 2026 · The most common question electricians face is "how many wires fit in this conduit?" Our conduit fill calculator 2026 provides the answer instantly, using official 2026 NEC Chapter 9 Table 4 standards. 22 Close Table 348. With over 50,000 monthly users across the electrical industry, it's the most trusted tool for NEC-compliant conduit fill calculations. This online tool is compatible with the US National Electrical Code (NEC) and provides useful links and information on conduits. The Wire Fill Calculator is a specialized tool designed to simplify the process of determining how many wires of a particular size can safely and legally fit within a conduit. Download the app for iOS or Android, or use the online tool to enter the conduit type and size, and specify your conductors. Calculate conduit fill percentage for multiple wire sizes, Cat6, Romex, and THHN. Select your conduit type, size, and wire types. rpbewhf qqu agxty rqxufb giwixfm rikf ununr kok tfqh aisnhi