Wire gauge, run length and the 3% rule — the copper math behind dim LEDs and hot connectors.
Round-trip voltage drop, percent loss and wasted watts for any cable run — copper or aluminium, AWG or metric.
Exact diameter, area, resistance and rule-of-thumb ampacity for any AWG gauge — from the ASTM B258 formula, not a lookup.
PV wire size from Isc with the NEC 1.56× design factor AND a voltage-drop target — returns the AWG that satisfies both.
Fuse rating from continuous load with headroom factor, snapped to standard sizes and checked against your wire's capacity.
Enter any two of voltage, current, resistance and power — get the other two with the substituted formula shown step by step.
Real, apparent and reactive power for DC, single-phase and three-phase systems with power factor — plus kWh per day.
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