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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 KVA rating has been calculated, divide that number by 0.8 to get the minimum KVA rating needed. 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: