Voltage Drop Calculator
Estimate copper or aluminum voltage drop for DC, single-phase, or three-phase circuits.
Result
Complete the fields to calculate.
Formula and method
ΔV = k × ρ × L × I / A
Important assumptions
L is one-way length; k accounts for return path or the three-phase factor. Resistivity is an ambient-temperature reference.
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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