Overfilling a conduit makes pulling wire brutal and violates NEC fill rules. Add each conductor's AWG and insulation, and get the minimum EMT conduit trade size.
Uses Chapter 9 area tables: 40% fill for 2+ conductors, with standard THHN/THWN dimensions.
Add as many conductors as you like at any AWG — the calculator sums their actual areas.
Staying at or under 40% fill keeps wire pulls smooth and protects the insulation.
All calculations run locally in your browser.
Wire it safely.