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kVA to Amps Calculator: Single & Three Phase
Convert kVA to amps, or amps back to kVA. Results include the values and assumptions used.
Formula and worked example
I = S × 1000 / (k × V)
S = k × V × I / 1000
k = 1 (single phase), √3 (three-phase L-L), or 3 (three-phase L-N).
S = k × V × I / 1000
k = 1 (single phase), √3 (three-phase L-L), or 3 (three-phase L-N).
How to use the calculation
S is apparent power in kVA, V is the selected RMS voltage and I is line current in amperes. For a three-phase calculation, state whether the voltage is measured line to line or line to neutral. The three-phase formulas assume a balanced load.
Worked example
100 kVA on a balanced 415 V L-L three-phase supply gives approximately 139.12 A line current. In reverse, 100 A at 415 V L-L corresponds to about 71.88 kVA.
Common questions
Do I need power factor to convert kVA to amps?
Power factor is not required for this apparent-power conversion. It is needed when converting between real power in kW and apparent power in kVA.
What voltage should I enter for three phase?
Select the voltage reference first. For example, enter 415 V only when your actual L-L supply is 415 V. Do not enter a line-to-neutral value while L-L is selected.
Does a transformer kVA rating prove its present current?
The calculation at rated kVA gives the corresponding rated current at that voltage. Present operating current depends on the actual connected load.
Related electrical guides
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Formula references
Formula review: 31 October 2026. Examples are illustrative; use your actual equipment and project data.
