Calculate conduit fill percentage, total conductor area, allowed fill area, spare conduit capacity, and fill status from wire size, conductor count, insulation type, conduit type, and conduit trade size.
Total conductor area:
The calculator multiplies each conductor area by the number of conductors.
Fill percentage:
The total conductor area is divided by the selected conduit internal area.
Fill status:
The result is compared against the selected fill limit to show whether the conduit is under, near, or over the fill target.
A conduit fill calculator helps estimate whether selected wires fit inside a selected conduit size.
It can help with branch circuits, feeder runs, garage wiring, shed wiring, equipment circuits, panel work, low-voltage conduit, and general electrical planning.
Your result shows conduit fill percentage, fill status, selected conduit size, recommended conduit size, conductor area, allowed area, spare area, conductor count, and comparison scenarios.
Conduit fill is the percentage of conduit space occupied by wires or conductors.
A common planning estimate is 40% fill for more than two conductors, 31% for two conductors, and 53% for one conductor.
Yes. Ground wires take up physical space inside the conduit and should be included in conduit fill estimates.
No. This calculator is a simplified planning tool. Always verify conductor type, conduit type, derating, box fill, bend limits, and local code requirements with a qualified electrician.