Wire Gauge Calculator
Estimate minimum conductor area from voltage-drop limits and compare standard sizes.
Result
Complete the fields to calculate.
Voltage-drop estimate only; verify ampacity, temperature, installation method, and local code.
Formula and method
Amin = k × ρ × L × I / ΔVmáx
Important assumptions
Voltage-drop area does not replace sizing for ampacity, protection, bundling, temperature, or local code.
Frequently asked questions
Does the calculation run locally?
Yes. Values are processed in your browser and are not sent to a server.
Can I use it for a real installation?
Use it as an educational reference and verify components, tolerances, safety, and applicable code with technical documentation or a qualified person.
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