Conduit Fill Calculator
Calculate conduit fill percentage based on wire count and size. Free, instant.
How to Use Conduit Fill Calculator
1
Enter the number of wires.
2
Enter each wire cross-section area.
3
Enter the conduit internal area.
Frequently Asked Questions
What is the NEC max conduit fill?
NEC allows 40% fill for 3+ wires, 31% for 2 wires, and 53% for 1 wire.