calculators
Wire Size Calculator Basic
Estimate cable cross-section from a voltage drop target using current, one-way length, voltage, material, and circuit type.
Frequently Asked Questions
What sizes are compared?
The calculator compares common sizes from 0.5 to 120 mm2 and returns the nearest common size that meets the selected voltage drop target.
What if my length is very long?
Long runs need larger cable cross-section to keep voltage drop within the selected planning limit.
Is this a cable sizing standard?
No. This is a voltage-drop based estimate for planning purposes only. Always follow your local electrical code and consult a qualified electrician for real installations.