WireWicket / Field calculation 01
EMT conduit fill calculator
Check repeated THHN / THWN-2 conductors of one selected size against an EMT trade size. This EMT-focused calculator also supports RMC, PVC Schedule 40, and PVC Schedule 80.
Enter 1–1,000 conductors, then choose the conductor size, raceway type, and a compatible trade size. The calculator reports total conductor area, allowable raceway area, fill percentage, and whether the result is within the selected fill limit.
Download a cut sheet with the displayed calculation and references. Reference values use NFPA 70 (NEC) 2026, including Chapter 9 Tables 1, 4, and 5 and the selected raceway’s applicable Article. Verify the edition adopted in your jurisdiction, local amendments, project review, and AHJ requirements. This is a calculation reference, not an approval of an installation.
Calculation inputs
Conductor groups
Mixed sizes are totaled by NEC Chapter 9, Table 5. Enter role labels to keep phase and EGC conductors clear.
Raceway fill checks conductor area only. It does not validate a motor installation or replace conductor, protection, or equipment review.
Raceway result