Tools / Conduit Fill
Conduit Fill
Enter the THHN/THWN-2 gauges and counts in a run of EMT. Fill is Σ(wire area × count) ÷ conduit area, checked against the Table 1 limits used here: 53% for one conductor, 31% for two, 40% for three or more.
Utility only — not a PE stamp, certified weather product, or code-approved calculation. Outputs are estimates from your inputs/files; verify before design, bidding, or compliance use. Terms
Fill
Fill5.46 %
Table 1 limit used here40.00 %
Remaining area0.5039 in²
Max of this gauge at 40%22
Within the Table 1 fill limit used here.
Fill % = Σ(wire area × count) ÷ EMT internal area. Limits are NEC Chapter 9 Table 1: 1 conductor 53%, 2 conductors 31%, 3+ conductors 40%. Areas are the THHN/THWN-2 and EMT values in this tool — not a substitute for the code edition in force.
Utility only — not a PE stamp, certified weather product, or code-approved calculation. Outputs are estimates from your inputs/files; verify before design, bidding, or compliance use. Terms