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 (VL-L)

S = √3 x VL-L x I ÷ 1000

S = (1.732 x VL-L x I) ÷ 1000

Conversion with Line to Neutral Voltage (VL-N)

S = 3 x VL-N x I ÷ 1000

Where:

  • S = Apparent Power in Volt-Amps
  • V = Voltage in Volts
  • I = Current in Amperes
  • VL-L = Line to Line Voltage in 3-Phase Circuits
  • VL-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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