APPARENT POWER
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VA | ≈ — W @ PF=0.85
AMPS TO VOLT-AMPS
Amps to Volt-Amps Calculator: Apparent Power Conversion
An amps to volt-amps calculator converts electrical current in amperes to apparent power in volt-amps (VA) by applying voltage. This calculation is essential for sizing electrical equipment and understanding power system capacity.
There are 3 key applications for VA calculations: transformer sizing, electrical service planning, and equipment capacity verification. The 2 most common misconceptions are confusing VA with watts, and forgetting phase configuration affects the calculation.
Amps to Volt-Amps Calculator
Amps to Volt-Amps Formulas
DC / Single-Phase AC
VA = I × V
Where:
I = Current (A)
V = Voltage (V)
Three-Phase AC (Line-to-Line)
VA = I × V × √3
≈ I × V × 1.732
Three-Phase AC (Line-to-Neutral)
VA = I × V × 3
For line-to-neutral voltage
Calculation Examples
Single-Phase Circuit
15A at 120V:
15 × 120 = 1800 VA
Typical for household circuit
Three-Phase Motor
10A at 230V line-to-line:
10 × 230 × 1.732 ≈ 1732 VA
Small industrial motor
DC Power Supply
5A at 48V:
5 × 48 = 240 VA
Network equipment power
Frequently Asked Questions
How do I convert amps to volt-amps?
For DC or single-phase AC: VA = Amps × Volts. For three-phase: VA = Amps × Volts × √3 (line-to-line) or VA = Amps × Volts × 3 (line-to-neutral).
What is the difference between VA and watts?
VA measures apparent power (total power drawn), watts measure real power (useful power). VA = Watts ÷ Power Factor.
When should I use VA instead of watts?
Use VA for sizing transformers, generators, UPS systems, and electrical service. These devices must handle the total apparent power, not just real power.