Wire Size Calculator
Calculates the correct electrical wire gauge (AWG) or millimeter size needed for any circuit based on load current, m...
What Wire Size Calculator does
The Wire Size Calculator at OhmNexus determines the appropriate electrical wire gauge for any circuit by calculating both ampacity and voltage drop. Users input load current, select conductor material (copper or aluminum), and choose from multiple wiring standards including NEC/CEC for US and Canada, IEC 60364-5-52 worldwide, BS 7671 for the UK, and AS/NZS 3008.1.1 for Australia. The output provides AWG or mm² sizing matched to the selected code, ensuring circuits handle electrical loads safely and efficiently while minimizing voltage loss. The tool accounts for installation method, insulation type, wire temperature rating, phase configuration, and ambient temperature to deliver code-compliant recommendations for residential and commercial projects.
How to use the OhmNexus Wire Size Calculator
- 1
Select your wiring standard to set the applicable electrical code and units (AWG for NEC/CEC or mm² for IEC/BS 7671/AS/NZS standards)
- 2
Enter your load current in amperes and choose conductor material (copper or aluminum)
- 3
Specify one-way length of the circuit optionally, or use the preset common circuits for dryers, ranges, EV chargers, and sub-panels
- 4
Configure installation method, insulation type, wire temperature rating, phase, and system voltage for precise voltage drop calculations
- 5
Click Calculate to receive the recommended AWG or mm² wire gauge with ampacity and voltage drop specifications
Best for
DIY enthusiasts, electricians, and homeowners planning residential or commercial wiring projects who need code-compliant wire sizing that accounts for specific installation conditions and local electrical regulations.
Limitations
- Results depend on accurate input of installation conditions and local code requirements
- Tool provides estimates based on standard tables and may not cover all unique or atypical installations
- No unit switching between metric and imperial beyond the selected wiring standard
Wire Size Calculator FAQ
- Can this calculator determine wire size for both 120V and 240V circuits?
- The calculator accounts for voltage drop across the circuit length, and results are influenced by the selected wiring standard which defines code-specific ampacity tables for different voltages and phases.
- Does the tool consider ambient temperature when sizing wire?
- Ambient temperature adjustments ensure the recommended wire gauge can safely carry the load without overheating in the specific environmental conditions of your installation.
- What's the difference between using AWG and mm² units in this calculator?
- Choosing the appropriate wiring standard ensures your wire selection meets the electrical codes and regulations applicable to your geographic location and project type.
- Can I use this calculator for off-grid or solar power systems?
- Selecting the appropriate circuit type and accounting for continuous load duration will provide suitable wire sizing for renewable energy installations.
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