## How to Convert Amps to kVA – Calculator and Examples

**Amps to kVA Calculator**

The following Amps to KVA conversion calculator will convert the current “I” in amperes “A” to apparent power “S” in kVA “kilovolt amperes”, VA “volt-amp”, mVA “millivolt amps” and MVA “mega volt amp”.

To calculate the kVA rating of a machine from the amperage rating, just enter the value of current in amperes, voltage in volts, select power supply system (single phase or three phase) and hit the “Calculate” button to the get the result of apparent power in kVA, VA, mVA and MVA.

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### Amps to kVA Conversion Formulas & Equations

**Single Phase Current in Amps to kVA Conversion**

**S = V x I ÷ 1000**

**kVA = Volts x Amps ÷ 1000**

**Three Phase Current in Amps to kVA Conversion**

**Conversion with Line to Line Voltage (V**_{L-L})

_{L-L})

**S = √3** x **V _{L-L} x I ÷ 1000**

**S = (1.732 x** **V _{L-L} x I) ÷ 1000**

**Conversion with Line to Neutral Voltage (V**_{L-N})

_{L-N})

**S = 3 x V _{L-N} x I ÷ 1000**

Where:

- S = Apparent Power in Volt-Amps
- V = Voltage in Volts
- I = Current in Amperes
- V
_{L-L}= Line to Line Voltage in 3-Phase Circuits - V
_{L-N}= Line to Neutral Voltage in 3-Phase Circuits

Note: There is no concept of apparent power in DC circuits as there is no frequency, power factor and reactive power exists in DC supply systems.

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**How to Convert Amps to kVA?**

Keep in mind that you must know the value of current and voltage to calculate the kVA rating of a machine.

**Single Phase Amps to kVA Calculation**

**Apparent Power in kVA = (Voltage in Volts x Current in Amperes) ÷ 1000**

**S = (V x I) ÷ 1000**

**Example: **

Find is the kVA rating of a single phase transformer if the primary current rating is 120 amperes and RMS voltage is 120V.

**Solution:**

S = (120V x 125A) **÷** 1000

**S = 15kVA**

**Three Phase Amps to kVA Calculation**

**Calculation with Line to Line Voltage**

**Apparent Power in kVA = (√3 x Voltage in Volts x Current in Amperes) ÷ 1000**

**S = (√3 x V x I) ÷ 1000**

**Example:**

Calculate the apparent power in kVA if the value of current is 28A and RMS voltage is 208V (line to line) three phase.

**Solution:**

S = (1.732 x 208V x 28A) ÷ 1000

**S = 10kVA**

**Calculation with Line to Neutral Voltage**

**Apparent Power in kVA = (3 x Voltage in Volts x Current in Amperes) ÷ 1000**

**S = (3 x V x I) ÷ 1000**

**Example:**

Calculate the rating of three phase transformer if the rating of three phase RMS voltage is 240V (line to neutral) and primary current is 25 amperes.

**Solution:**

S = (3 x 240V x 25A) ÷ 1000

**S = 18kVA**

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