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kVA to Amps Calculator

Convert kVA to amps, the full-load current, for single- and three-phase systems. Built for sizing transformers, generators, and feeders, it also shows the NEC breaker and copper wire the load needs.

Convert
Phase

Full-load current

208.2 A

Apparent power
75 kVA
Full-load current
208.2 A
System
208 V 3-phase

NEC wire & breaker for this load

Breaker
300 A
Min. copper wire (75°C)
–

Sized at 125% for a continuous load (NEC 210.19/215.2): 208.2 A × 1.25 = 260.2 A.

Copper, 75°C terminations, NEC Table 310.16. Real installs may need derating for ambient heat, conduit fill, or voltage drop. Full wire & breaker chart. Always confirm with a licensed electrician + local AHJ.

Measure the real amps and volts

The converter works from nameplate or assumed figures. A clamp meter reads the actual current on one conductor without breaking the circuit; clamped around a whole cord it reads close to zero. A multimeter reads the voltage at the receptacle or terminals. Opening a panel or a live box is work for someone qualified.

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Frequently asked questions

Single-phase: amps = kVA × 1,000 ÷ volts. Three-phase: amps = kVA × 1,000 ÷ (1.732 × line-to-line volts). kVA is apparent power, so no power factor is involved. Example: 75 kVA at 208V three-phase ≈ 208 amps.

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WattSimple. (2026, July 19). kVA to Amps Calculator. https://wattsimple.com/convert/kva-to-amps

MLA

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Sources & standards

This tool's methodology and data follow US standards and authoritative public datasets: