NEC Conduit Fill Calculator (EMT, PVC & Rigid)
Calculate exact conduit fill percentage under NEC Chapter 9 Tables 1, 4, and 5—including mixed wire bundles and 60% conduit nipples.
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config.js)1. NEC Conduit Fill Calculator (Chapter 9, Tables 1, 4 & 5)
Recommended Job-Site Materials & Tools for This Run
| Trade Size | Internal Dia. | Total Area | Bundle Fill % | Max Primary Wires | NEC Status |
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Popular Instant NEC Conduit Fill Lookup Charts
Direct job-site answers for the most common wire and conduit combinations:
- How Many 12 AWG THHN Wires Fit in 1/2" EMT Conduit? (NEC Chart) — 9 wires max
- How Many 12 AWG THHN Wires Fit in 3/4" EMT Conduit? (NEC Chart) — 16 wires max
- How Many 10 AWG THHN Wires Fit in 1/2" EMT Conduit? (NEC Chart) — 5 wires max
- How Many 10 AWG THHN Wires Fit in 3/4" EMT Conduit? (NEC Chart) — 10 wires max
- How Many 8 AWG THHN Wires Fit in 3/4" EMT Conduit? (NEC Chart) — 5 wires max
- How Many 6 AWG THHN Wires Fit in 3/4" EMT Conduit? (NEC Chart) — 4 wires max
- How Many 6 AWG THHN Wires Fit in 1" EMT Conduit? (NEC Chart) — 6 wires max
- How Many 4 AWG THHN Wires Fit in 1-1/4" EMT Conduit? (NEC Chart) — 7 wires max
- How Many 12 AWG THHN Wires Fit in 3/4" PVC Schedule 40 Conduit? (NEC Chart) — 15 wires max
- How Many 6 AWG THHN Wires Fit in 1" PVC Schedule 40 Conduit? (NEC Chart) — 6 wires max
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