Residential Conduit Fill Calculator
Calculate conduit fill for residential electrical projects with our free, NEC-compliant calculator. This tool is specifically designed for common home wiring scenarios including 15A and 20A branch circuits, appliance circuits, and general residential installations.
Whether you're running circuits for lighting, receptacles, kitchen appliances, or air conditioning units, our calculator ensures your residential conduit installations meet all National Electrical Code requirements for safe and compliant home wiring.
Input Parameters
Conductors
Results
Visual Representation
Enter conduit and wire information to see results
NEC Fill Requirements
According to NEC Chapter 9, Table 1: 1 conductor = 53% max, 2 conductors = 31% max, 3+ conductors = 40% max, Nipples = 60% max
Common Residential Circuit Examples
15A & 20A Branch Circuits:
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General Lighting (15A)14 AWG THHN, 1/2" or 3/4" EMT
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Receptacle Circuits (20A)12 AWG THHN, 1/2" or 3/4" EMT
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Bathroom Circuits (20A)12 AWG THHN, 1/2" EMT
Appliance Circuits:
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Kitchen Small Appliances (20A)12 AWG THHN, 1/2" or 3/4" EMT
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Dishwasher/Disposal (20A)12 AWG THHN, 1/2" EMT
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AC/Heat Pump (30-50A)10-6 AWG THHN, 3/4" to 1" EMT
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