// multi-utility computation suite · offline · instant · precise
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eng.cable-sizing-voltage-drop Calculator
Calculates cable voltage drop from current, cable resistance, and length, and determines minimum cable cross-section to meet NEC 3% drop limit. Voltage drop in long cable runs reduces equipment performance — motors operating at 95% rated voltage experience 10% increase in current draw.
Inputs
Current A
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
Cable Length M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Voltage V
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Conductor Cross Mm2
Reference formula or conversion factor shown for context.
Results
voltage drop (V)
Electric potential difference between the two terminals (V). In AC systems, quoted as RMS — 230 V mains has a peak of ~325 V.
percentage drop (%)
The result expressed as a percentage of the reference value.
acceptable?
Reference formula or conversion factor shown for context.
resistance (mΩ)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.