Conduit Fill Percentage Calculator
Conduit Fill Calculator
Estimate conduit fill % and check against typical NEC fill limits (1 conductor: 53%, 2 conductors: 31%, 3+ conductors: 40%).
Conduit areas based on NEC Chapter 9 Table 4 style values.
Conductors
Add conductors, then click Calculate.
Note: This is an estimating tool. Always verify with the current NEC and your exact cable/conduit specs.