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Input the values of ampere and voltage. Then to calculate KVA (rating) choose between three-phase and single-phase from the Transformer calculator.

This 3 in 1 calculator helps users to find the current, voltage, and rated phase power of the step up and step down transformer. you can choose to find any of these values.

A passive electrical device that transmits a power supply. A transformer basically transfers electricity from one circuit to multiple or other circuits.

**Step-up transformers have higher secondary voltage than the primary voltage.**

**Step-down transforms have higher primary voltage.**

Transformer rating describes the capability of the transformer to handle voltage and current. It is necessary to know to save any damage to the powerline.

Transformer rating is calculated in kVA (KiloVolt Amperes). During the transformer sizing, the calculator above can come in handy to compute kVA.

The formula of kVA for a single-phase is:

**kVA = (V x I) / 1000**

The formula for a three-phase transformer is:

** kVA = (**√**3****.V x I) / 1000**

In these equations:

**kVA**is the power rating.**V**is voltage.**I**is current.

**Example:**

Calculate kVA of a three-phase transformer if:

V = 200

A = 130

**Solution:**

kVA = (√3. V x I ) / 1000

kVA = (√3. 200 x 130 ) / 1000

kVA = 45,033/1000

**kVA = 45**