Amps to VA Calculator

Enter the current in amps (A), voltage in volts (V), then press the Calculate button to get the result in volt-amps (VA).

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To use this Amps to Volt-Amps calculator:

1. Select the phase type: Single Phase or Three Phase.
2. Enter the value of current in amps in the “Current (A)” input field.
3. Enter the value of line to line voltage in volts in the “Line to Line Voltage (V)” input field.
4. Click on the “Calculate” button to get the apparent power in volt-amps.
5. The result will be displayed in the “Apparent Power (VA)” field below the buttons.
6. If you want to calculate again with different values, you can change the input values and click on the “Calculate” button again.
7. If you want to reset the calculator, you can click on the “Reset” button. This will clear all the input fields and the result field.

Note: Make sure to enter valid values for the current and voltage fields. If you enter invalid values, an alert will pop up asking you to enter valid values. Also, this calculator assumes a power factor of 1 (i.e., no reactive power component).

The formula for Calculating VA from Single-Phase Amps

In single-phase circuits, the formula to calculate the apparent power (S) in volt-amps is quite simple. It is just the product of the current (I) in amps and the voltage (V) in volts. So the formula is:

S_(VA) = I_(A) x V_(V)

For example, if you have a circuit with a current of 5 amps and a voltage of 120 volts, the apparent power would be:

S = 5A x 120V = 600VA

This formula is useful for calculating the total power consumed by a single-phase circuit, and it’s important to ensure that the circuit is not overloaded beyond its capacity.

Formula to Calculate VA from 3-Phase Amps

The formula to calculate the apparent power S in kilovolt-amps (VA) for a three-phase circuit is:

S_(VA) = √3 × I_(A) × V_L-L(V)

To calculate the apparent power, you need to know the current and voltage values for the three phases of the circuit. The formula uses the square root of 3 to account for the fact that the power is being calculated for a three-phase circuit, rather than a single-phase circuit. Once you have calculated the apparent power, you can use it, along with the power factor, to calculate the real power (in watts) and reactive power (in VAR) of the circuit.

For example, let’s find the amps for a 400 volt three-phase electrical circuit with 50 amps of current.

S_(VA) = √3 × 400 V × 50 A = 34 641 VA

Thus, a 400 volt three-phase electrical circuit with 50 amps of current has an apparent power of 34 641 volt-amperes.

Amps to VA Conversion Tables

The table 1 shows the relationship between current in amperes (A) and the corresponding apparent power in Volt-Amps (VA) for various current values. The current values range from 1 milliampere (mA) to 100 amperes (A) with increments of 1 mA or 1 A, respectively. The table provides a convenient reference for determining the amount of apparent power needed to operate electrical equipment or devices at different current levels in a 230V single-phase system.

Amps to VA conversion table 2 for a 400V three-phase electrical system, where the apparent power S in volt-amps (VA) is equal to the square root of 3 times the line to line voltage V times the current I in amperes (A).

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