Lighting Transformer Calculator
Size transformers, check voltage drop, and get the wiring right.
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Transformer Size
Voltage Drop
Current & Ratio
Number of fixtures
Watts per fixture
W
Extra load (optional)
W
Load type
Halogen / Incandescent
LED
Safety margin
20%
Calculate
Reset
—
Recommended transformer
—
Total load
Margin
—
Total load
—
Required (with margin)
System voltage
12 V
24 V
Custom…
V
Load
Watts
Amps
W
Cable length (one-way)
m
ft
Cable cross-section
mm²
AWG
Max acceptable drop
3%
Calculate
Reset
Within limit
—
Voltage at fixture
—
Voltage drop
—
Current
Primary voltage
V
Secondary voltage
V
Load
W
kW
Efficiency
90%
Calculate
Reset
—
Turns ratio (primary : secondary)
—
Secondary current
—
Primary current
Read the full guide
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