Construction
Transformer Sizing Calculator
kVA = load amps × voltage × phase factor. Add 25% headroom for inrush and future load.
kVA required
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- kW @ PF
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- Standard size
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- With 25% headroom
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FAQ
Why 25% headroom? +
Motor inrush is 4-6x running current for 1-2 seconds. Plus future load growth. Always size up.
Three-phase formula? +
kVA = (V × I × √3) / 1000. The √3 factor is the line-to-line vs phase voltage relationship.