Skip to content
WattSimple

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.

Phase

Full-load current

208.2 A

Apparent power
75 kVA
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.

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.

Ask AI about this

Open an AI assistant with a question grounded in this page.

ChatGPTClaudePerplexityGoogle AIGrok

Related tools

Related converters

Watts ↔ 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 converter

kW ↔ Amps

Convert kilowatts to amps (or amps to kW) for DC, single-phase, and three-phase circuits, with the matching NEC wire and breaker size.

Open converter

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 converter

Voltage 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 converter