Instructions: Enter the DC supply voltage, total load power and one-way cable distance from the power supply to the load. The calculation includes both the outgoing and return copper conductors. Use the load carried by this cable run.
| Wire gauge / approximate area | Voltage drop (3% target) |
|---|
Metric areas show the approximate cross-sectional area of each AWG conductor; they are not standard metric cable sizes. Results use nominal solid-copper AWG resistance at 20 °C and estimated current (load watts / supply volts). Warmer conductors and actual cable construction can increase resistance. Connector losses and voltage drop within the fixture or LED strip are excluded. This is a nominal-current estimate; actual load current may change with voltage. The 3% figure is a design target, not a cable current rating or installation approval. Check cable ampacity, protection and the fixture manufacturer's requirements separately. This calculator is for two-wire DC feeds, not AC or constant-current driver circuits.
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