Amps to VA Calculator

Amps to VA calculator

Amps (A) to volt-amps (VA) calculator and how to calculate.

Enter phase number, the current in amps, the voltage in volts and press the Calculate button,

to get the apparent power in volt-amps:

A
V
VA

Single phase amps to VA calculation formula

The apparent power S in volt-amps is equal to current I in amps, times the voltage V in volts:

S(VA) = I(A) × V(V)

3 phase amps to VA calculation formula

The apparent power S in kilovolt-amps is equal to square root of 3 current I in amps, times the line to line voltage VL-L in volts:

S(VA) = √3 × I(A) × VL-L(V) = 1.732 × I(A) × VL-N(V)
📋 Example Calculation

Single Phase Example:

Calculate the apparent power for a single-phase circuit with:

  • Current (I) = 10 Amps
  • Voltage (V) = 120 Volts

Solution:

S(VA) = I(A) × V(V)

S(VA) = 10 A × 120 V = 1,200 VA

Three Phase Example:

Calculate the apparent power for a three-phase circuit with:

  • Current (I) = 15 Amps
  • Line-to-Line Voltage (VL-L) = 480 Volts

Solution:

S(VA) = √3 × I(A) × VL-L(V)

S(VA) = 1.732 × 15 A × 480 V = 12,470.4 VA

FAQS

How to convert amps to VA?

To convert amps to VA, multiply the current (amps) by the voltage using the formula: VA = Amps × Volts. For example, 10 amps at 120 volts equals 1,200 VA (10 × 120 = 1,200 VA).

The number of amps in 1 VA depends on the voltage: Amps = VA ÷ Volts. At 120V, 1 VA equals 0.0083 amps, while at 240V, 1 VA equals 0.0042 amps.

100 VA converts to different amp values based on voltage: at 120V it’s 0.83 amps (100÷120), at 240V it’s 0.42 amps (100÷240). Use the formula: Amps = VA ÷ Voltage to calculate for any voltage.

30 amps equals different VA ratings depending on voltage: 3,600 VA at 120V (30×120) or 7,200 VA at 240V (30×240). The formula is VA = Amps × Voltage for accurate conversion.

Convert milliamps to VA by first converting to amps (divide by 1,000), then multiply by voltage: VA = (Milliamps ÷ 1,000) × Volts. For example, 500 milliamps at 12V equals 6 VA (0.5 × 12 = 6).

Volt-amps (VA) and VA are the same unit measuring apparent power in electrical circuits. No conversion is needed – 1 volt-amp equals 1 VA, making this a direct 1:1 relationship.

Watts to VA calculator?

Convert watts to VA using the power factor: VA = Watts ÷ Power Factor. With a 0.8 power factor, 800 watts equals 1,000 VA (800 ÷ 0.8 = 1,000). Power factor ranges from 0.1 to 1.0.

1000 VA converts to different amp values: 8.33 amps at 120V (1000÷120) or 4.17 amps at 240V (1000÷240). Use Amps = VA ÷ Voltage to calculate for your specific voltage requirement.

Calculate transformer VA rating by multiplying primary voltage by primary current, or secondary voltage by secondary current: VA = V × I. A transformer with 120V and 10A has a 1,200 VA rating.

You cannot directly convert amps to volts as they measure different electrical properties. However, using Ohm’s Law with resistance: Volts = Amps × Resistance, or with power: Volts = Watts ÷ Amps.

For 3-phase systems, calculate VA using: VA = √3 × Line Current × Line-to-Line Voltage, or VA = 3 × Line Current × Line-to-Neutral Voltage. This accounts for the phase relationships in three-phase power systems.

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