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kVA to Amperage Calculator — result sheet
Convert apparent power, RMS voltage, and single- or balanced three-phase selection into an estimated line current.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Single phase I=S/V; balanced three-phase line current I=S/(√3V), with S=kVA×1000 and V as RMS line voltage.
Apparent power in kVA relates voltage and current without requiring a power factor because kVA already represents the volt-ampere magnitude. This calculator keeps the phase model explicit: single-phase current uses S/V, while a balanced three-phase system uses S/(√3V) with line-to-line RMS voltage. It estimates current only and does not choose a conductor, breaker, transformer, or installation method.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Apparent power — kVA; minimum 1.0E-6; maximum 1000000000
- RMS voltage — V; minimum 1.0E-6; maximum 1000000
- Supply model — 2 choices
Worked example
| Input | Value |
|---|---|
| Apparent power | 10 |
| RMS voltage | 230 |
| Supply model | single |
A 10 kVA single-phase load at 230 V corresponds to about 43.478 A; balanced three-phase mode would be about 25.10 A at the same line voltage.
Assumptions and limits
- Voltage and apparent power are RMS quantities and use a consistent electrical system definition.
- Single-phase mode uses the entered voltage directly; three-phase mode assumes a balanced system and line-to-line voltage.
- Power factor is already represented by the apparent-power input, so real watts are not inferred.
- Phase imbalance, harmonics, starting current, voltage drop, conductor heating, protection, code rules, and equipment ratings are not modeled.
- The result is a planning arithmetic estimate and must not be treated as electrical installation approval.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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