Electrical Tool
Voltage Drop Calculator
Estimate voltage drop for copper and aluminium conductors using circuit type, voltage, current, cable length, and conductor cross-section.
Circuit setup
Input values
Use practical planning values. For final design, verify against applicable IEC/DIN/VDE/NEC requirements and local project specifications.
How to use
- Select the circuit type and conductor material.
- Enter voltage, current, one-way cable length, and conductor cross-section.
- Compare the calculated voltage drop against your target percentage.
- Increase conductor size or reduce length/current if the drop is too high.
Reference notes
Typical planning targets are often around 3% for final circuits and 5% overall, but actual requirements depend on the installation standard, load type, voltage level, safety factors, and local regulations.
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