Transformer Size Calculator
Size a transformer (kVA) for single-phase or three-phase loads with a safety margin.
Formulas
- kVA required = kW / PF
- With margin: kVA_sized = kVA required × (1 + spare%/100)
- Standard sizes: 1, 1.5, 2, 3, 5, 7.5, 10, 15, 25, 50, 75, 100, 167, 250, 333, 500 kVA