Wire Size & Voltage Drop Calculator
Estimate a planning-level conductor size from voltage, load, one-way distance, conductor material and a chosen voltage-drop target for DC, AC or three-phase circuits.
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Planning utilities for cable sizing, voltage-drop checks and raceway fill. Use the results as design references, then verify the installation against the code adopted by your jurisdiction and the exact equipment or conductor specifications.
Conduit Fill Calculator
Check conductor area against raceway fill limits for common conduit types and compare practical trade sizes for a selected conductor combination.
Open calculatorHow these tools fit together
- Start with the circuit load and installation assumptions, then use the wire-size calculator to estimate a conductor size and voltage drop.
- Use the conduit-fill calculator to check whether the chosen conductor combination fits the selected raceway.
- Complete the other required checks, including ampacity, adjustment and correction factors, grounding and bonding, temperature, terminal ratings, protection and local code requirements.
Important: these tools are planning aids, not a certification of code compliance. Electrical requirements vary by jurisdiction, equipment, conductor construction and installation conditions. Follow applicable code, manufacturer instructions and qualified electrical guidance where required.