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Watts to VA calculator FullScreen

Convert real power in watts (W) to apparent power in volt-amperes (VA). Perfect for understanding the total power requirements of electrical systems and equipment. Obtain an estimation of volt-amperes from watts using this convenient online tool.

Enter watts: W
Enter power factor:  
Result in volt-amps: VA


What is Watts to VA calculator

To convert watts (W) to volt-amperes (VA), you need to consider the power factor (PF) of the electrical circuit. The relationship between watts, volt-amperes, and power factor is given by the formula:

VA = Watts / Power Factor

To calculate the volt-amperes, divide the power in watts by the power factor.

For example, if you have a device with a power consumption of 1000 watts (W) and a power factor of 0.8, you can calculate the volt-amperes as follows:

VA = 1000 W / 0.8 VA = 1250 VA

In this example, the device would require approximately 1250 volt-amperes.

The power factor represents the efficiency or quality of power utilization in the electrical system. A power factor of 1 (unity) indicates a purely resistive load where voltage and current are in phase. For loads with reactive components such as inductive or capacitive elements, the power factor may be lower than 1, resulting in an increased VA requirement compared to the wattage alone.

It's important to note that for circuits with complex loads or non-linear devices, the relationship between watts and VA becomes more intricate and may involve considerations of harmonic content and additional factors such as crest factor and distortion power factor.

Watts to VA calculation

The apparent power S in volt-amps (VA) is equal to the real power P in watts (W), divided by the power factor PF:

S(VA) =  P(W) / PF

Watts to VA calculator Example

To convert watts (W) to volt-amps (VA), you need to consider the power factor (PF) of the electrical load. The formula for calculating VA from watts and power factor is:

VA = W / PF

Here's an example table that demonstrates how to calculate VA from different wattage values and corresponding power factors:

Watts (W) Power Factor (PF) VA
100W 0.8 125 VA
200W 0.9 222.22 VA
150W 0.85 176.47 VA
75W 0.95 78.95 VA

In this example, we assume various power factors for different electrical loads. To calculate the VA, divide the given watts by the corresponding power factor. For example, if you have 100W of power with a power factor of 0.8:

VA = 100W / 0.8 VA = 125 VA

Therefore, for 100W and a power factor of 0.8, the VA is 125 VA.

Perform the same calculation for the other examples in the table using the provided wattage and power factor values to obtain the apparent power in volt-amps (VA).

Remember, the power factor accounts for the difference between real power (watts) and apparent power (VA) in an electrical system. The actual power factor value may vary depending on the specific electrical load.