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Conduit Fill Calculator

NEC Chapter 9 Table 1/4/5 (US) or IEC/BS 7671 45% space-factor method (conduit) / 40% (trunking). Free — no subscriber gating.

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Conduit Fill Calculator

NEC Chapter 9, IEC/BS 7671 space-factor

Generated

For preliminary engineering use only — always verify results against project-specific standards and a qualified engineer's review before use in a real design.

Standard basis

Conduit

Conductors

NEC fill result

Total Conductors6
Fill Tier40% (3+ conductors)
Sum of Conductor Areas0.0798 in²
Max Allowable Area0.2132 in² (of 0.5330 in² total)
Fill %15.0% ✓
Suggested Min. Trade Size1/2" EMT