Electrical Calculators
Cable Sizing Calculator
Estimate minimum copper cable cross-section to keep voltage drop within limits.
Inputs
Result
Min. copper area
5.25mm²
Formula
A = (2 × L × I × ρ) / Vd_max
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Formula
A = (2 × L × I × ρ) / Vd_max
Worked example
(2 × 50 × 30 × 0.0175) / 10 = 5.25 mm² → use 6 mm²
FAQ
+Should I derate for temperature?
Yes — and for grouping; check IEC 60364 / NEC tables.
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