Landscape Lighting Transformer Calculator
Size a low-voltage landscape lighting transformer and calculate voltage drop, maximum cable run, and recommended wire gauge.
Inputs
W
ft
AWG
Results
Transformer Size
150 W
Voltage Drop
1.33 V
Total Wattage50 W
Max Run at 10% Drop90.6 ft
Recommended Gauge16 AWG
How to Use This Calculator
- List each fixture type and its wattage, then enter the total number of each fixture.
- Calculate the total wattage load across all landscape lights.
- Enter a 20% safety margin to avoid overloading the transformer.
- Review the recommended transformer VA rating and select the next standard size above your total.
- Keep total load below 80% of transformer capacity for reliable long-term performance.
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