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  • Phone: 479-646-1668
  • Fax: 479-646-4101
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  • 6107 South Zero Street
  • Fort Smith Arkansas 72903
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Transformer calculator

HOW TO SIZE A TRANSFORMER

  • Transformers are sized by determining the total load required (in amps).
  • Transformer capacity is rated in KVA (kilo-volt-amperes).
  • The load voltage and load amps must be known to calculate KVA rating.
  • * NOTE: We do not recommend loading a transformer above 80% of its KVA rating. When the initial minimum KVA rating has been calculated, divide that number by 0.8 to get a KVA rating that will provide a 20% buffer. All values should be reviewed and confirmed by an electrician or electrical engineer.
NOTE: If you need assistance with circuit protection devices such as fuses or breakers, or wire sizing, please consult a licensed electrical contractor or electrician in your area who will be familiar with state and local codes.

All information obtained while using this calculator should be confirmed by a qualified electrical contractor or engineer.
 

1. Select transformer phase.

2. Enter any two values, then click or tap "Calculate"

KVA:

Volts:

Amps:

FORMULAS USED IN CALCULATOR:

1-Phase KVA = Volts x Amps / 1000
1-Phase Amps = KVA / Volts x 1000
3-Phase KVA = Volts x Amps x 1.732 / 1000
3-Phase Amps = KVA / Volts / 1.732 x 1000

 

REQUEST A QUOTE: