Electrical Tools

Conduit Fill Calculator

Calculate conduit size for electrical wires per NEC Chapter 9 Tables. Supports EMT, PVC, flexible conduit, and wire fill percentages.

Conduit & Wire Specifications

Conduit Fill Analysis

Minimum Conduit -
Fill Percentage 0%
Total Wire Area 0 sq in
Conduit Area 0 sq in
NEC Max Fill (40%/53%) 40%
Equipment Ground -
Status -
Est. Conduit Cost/100ft $0

NEC Fill Limits

  • 1 conductor: 53% fill
  • 2 conductors: 31% fill
  • 3+ conductors: 40% fill

Formula

Fill % = (Wire Area ÷ Conduit Area) × 100

Max Fill = Based on conductor count

Wire Area = NEC Chapter 9 Table 5

Conduit Area = NEC Chapter 9 Table 4

Need Professional Help?

Get detailed electrical conduit plans from our expert team.

Get a Quote