⚡ Conduit Fill Calculator
Calculate electrical conduit fill percentages with NEC compliance checking. Determine proper conduit sizing for electrical installations with wire area calculations.
Conduit Selection
Wire Configuration
No wires added yet. Click "Add Wire" to start.
NEC Fill Guidelines
1 conductor:53% max fill
2 conductors:31% max fill
3+ conductors:40% max fill
Based on NEC Article 314.16 and Chapter 9, Table 1
Features
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NEC Compliance
Automatic NEC Article 314.16 compliance checking
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Multiple Conduit Types
EMT, IMC, RMC, and PVC Schedule 40 support
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Wire Database
Comprehensive THWN/THHN and XHHW wire data
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Detailed Reports
Professional calculation reports for documentation
How to Use This Calculator
Step-by-Step Guide
- 1Select your conduit type and size from the dropdown menu.
- 2Click "Add Wire" to add conductors to your configuration.
- 3For each wire, specify the AWG size, insulation type, and quantity.
- 4Review the fill analysis and NEC compliance status in real-time.
- 5Copy the detailed report for your electrical plans or documentation.
Important Notes
- • This calculator uses NEC Chapter 9, Table 1 fill percentages
- • Wire areas include insulation thickness per NEC requirements
- • Equipment grounding conductors may have different requirements
- • Always verify calculations with local electrical codes
- • Consider derating factors for temperature and bundling
- • This tool is for reference only - consult a licensed electrician