Low-Voltage Lighting Calculator

Our voltage drop calculator helps you size wiring for low-voltage lighting systems, including LED strips, landscape lighting, and 12/24V systems. Excessive voltage drop causes dim lights at the end of runs and can damage LEDs by causing them to draw more current.

Low-voltage systems are particularly sensitive to voltage drop because the percentage lost is much higher at 12V than at 120V. A 1-volt drop represents 8% loss at 12V but less than 1% at 120V. Proper wire sizing ensures consistent brightness and extends LED lifespan.

This calculator is essential for landscape lighting installers, LED strip users, and anyone asking "what wire size for 12V LED lights?" or "why are my landscape lights dim?" Keep voltage drop under 5% for best results, under 10% maximum.