Amps to kVA Calculator
Convert amps to kVA for single-phase and three-phase systems, or work backwards from a kVA rating to the current it draws. WattSimple also names the next standard transformer size up and the real kW the load delivers at your power factor.
kVA is apparent power — volts × amps, before power factor. It is what conductors and transformer windings actually carry, which is why transformers and generators are rated in kVA rather than kW. Power factor only affects how much of that becomes useful work.
Apparent power
83.14 kVA
- Current
- 100 A
- Apparent power
- 83.14 kVA
- Real power @ 0.85 PF
- 70.67 kW
- Configuration
- 480 V 3ø
Next standard transformer size
112.5 kVA three-phase — leaving 26% spare capacity above the 83.14 kVA calculated.
Standard ratings only. Actual selection also accounts for future load growth, ambient and altitude derating, harmonic K-factor, and NEC 450 overcurrent protection. Confirm with the engineer of record.
Frequently asked questions
Ask AI about this
Open an AI assistant with a question grounded in this page.
Related tools
Related converters
Ohm's Law
Solve volts, amps, ohms, and watts from any two values using the full Ohm's law power wheel — with the wire ampacity for the resulting current.
Open converterVoltage Drop
Calculate voltage drop and percentage over a wire run, and get the smallest wire gauge that keeps you under the NEC 3% recommendation.
Open converterkW ↔ kVA
Convert kW to kVA at any power factor, with the next standard generator and transformer size up — the rating you actually have to buy for the load.
Open converterWatts ↔ Amps
Convert watts to amps (or amps to watts) for DC, single-phase, and three-phase — plus the NEC wire and breaker the result needs.
Open converterSources & standards
This tool's methodology and data follow US standards and authoritative public datasets: