Voltage drop
For a two-wire run, V_drop = 2 × I × ρ × L / A. The result is an estimate for the stated conductor temperature.
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Voltage Drop Calculator
Estimate voltage drop and percentage loss in a cable run.
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Enter current, one-way length, conductor size and material.
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Assumptions and limits.
- Copper conductor at 20 °C unless another temperature is entered; two-wire run unless chassis return is selected.
Frequently asked questions
What voltage drop is acceptable?
Acceptable drop depends on the application and standard. This tool reports the value; it does not certify a design.