Load to Apparent Power

Amps to kVA Calculator

Utility load factor auditing, checking transformer loading percentage. Calculates total apparent power demand from measured circuit current.

Amps to kVA Calculator
Amps
Volts
Phase
Calculated Result
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Instant Calculation
Engineering Output
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Auxiliary Output
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Step-by-Step Derivation ▼ Show Steps
Governing Formula Verified Physics
1-Phase: kVA = (I × V) / 1000  |  3-Phase: kVA = (√3 × I × V) / 1000

Calculations adhere to standard electrical engineering physics and National Electrical Code (NFPA 70) regulations.

Engineering Principles & Calculations

This calculator uses the exact mathematical relationships between Current (Amps), Voltage (V), Phase Type (1Φ or 3Φ) to determine Apparent Power (kVA). In practical installations, factors such as ambient raceway temperature, harmonic distortion, duty cycle continuous operation, and conductor impedance must be accounted for by a certified electrician.

Calculates total apparent power demand from measured circuit current.

Typical Application & Industry Guidelines

Utility load factor auditing, checking transformer loading percentage.

Reference Matrix

Amps to kVA Calculator Benchmark Lookup Table

AmperagekVA @ 120V 1-PhasekVA @ 208V 3-PhasekVA @ 480V 3-Phase
20 Amps2.4 kVA7.2 kVA16.6 kVA
50 Amps6.0 kVA18.0 kVA41.6 kVA
100 Amps12.0 kVA36.1 kVA83.1 kVA
200 Amps24.0 kVA72.1 kVA166.3 kVA
400 Amps48.0 kVA144.3 kVA332.6 kVA
FAQ

Frequently Asked Questions

How do you calculate kVA from Amps? +
For 3-phase: kVA = (1.732 × Amps × Volts) / 1000. For single-phase: kVA = (Amps × Volts) / 1000.
How many kVA is 100 amps at 480V 3-phase? +
kVA = (1.732 × 100 × 480) / 1000 = 83.14 kVA.
Why is the 3-phase multiplier 1.732? +
1.732 is the square root of 3 (√3), which mathematically accounts for the 120-degree phase shift between the three voltage lines.

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