NEC Calculator · Standard transformer kVA sizes, 125% continuous-load factor, primary/secondary FLC
Transformer Sizing Calculator
Selects the next standard transformer kVA rating at or above the load (with a 125% continuous-load adjustment where applicable) and computes primary and secondary full-load current.
What it calculates
- Required kVA after the continuous-load 125% adjustment, if selected
- Next standard transformer size (15 through 2500 kVA)
- Primary and secondary full-load current for single- and three-phase transformers
Typical inputs
- Connected load kVA
- Whether the load is continuous
- Primary and secondary voltage, phase
Frequently asked
Which standard kVA sizes does this check against?
The common distribution-transformer sizes: 15, 30, 45, 75, 112.5, 150, 225, 300, 500, 750, 1000, 1500, 2000 and 2500 kVA.
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