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kW to VA Calculator
Use this free kilowatts (kW) to volt-amps (VA) calculator to instantly convert real power into apparent power. Simply enter your kilowatt value and power factor, then click Calculate to get the result in volt-amps.
How to Use the kW to VA Calculator
Converting kilowatts to volt-amps is a common task in electrical engineering, UPS sizing, generator selection, and understanding power bills. This calculator on checkbillonline.com makes it effortless — no manual math required.
Step 1 – Enter the kilowatts (kW): Type the real power value in the first field. For instance, if your appliance or generator is rated at 5 kW, enter 5.
Step 2 – Enter the power factor (PF): The power factor is a decimal value between 0.01 and 1. Most household and commercial equipment operates at a power factor between 0.7 and 0.95. If you are unsure, a commonly used default is 0.85. Always check your device's datasheet for the exact value.
Step 3 – Click "Calculate": The tool instantly applies the formula VA = (kW × 1000) ÷ PF and displays the result in volt-amps below the buttons.
Step 4 – Reset if needed: Click the red Reset button to clear all fields and start over.
This tool is completely free to use. Bookmark checkbillonline.com to access it anytime.
kW to VA Calculation Formula
The apparent power S in volt-amps (VA) is equal to 1000 times the real power P in kilowatts (kW), divided by the power factor PF:
Worked Example
Question: Convert 10 kW with a power factor of 0.9 to volt-amps.
Solution:
S(VA) = 1000 × 10 kW / 0.9 = 11,111.11 VA
Another example: A UPS needs to supply 3 kW at a power factor of 0.8. What VA rating is needed?
S(VA) = 1000 × 3 / 0.8 = 3,750 VA — so you would need at least a 3.75 kVA UPS.
Kilowatts to Volt-Amps Conversion Table
The table below uses a standard power factor of 0.85, for kW values from 1 to 100.
| Kilowatts (kW) | Volt-Amps (VA) @ PF 0.85 |
|---|
Frequently Asked Questions (FAQs)
kW (kilowatts) measures real power — the actual energy consumed to do work. VA (volt-amps) measures apparent power — the total power supplied by the source, including both useful and reactive power. The ratio between the two is called the power factor.
The power factor (PF) is a number between 0 and 1 that represents how efficiently electrical power is being used. A PF of 1 means all supplied power is used as real power. You can find the PF on the device's nameplate, datasheet, or energy meter. A typical default for household loads is 0.85.
Generators, UPS systems, and inverters are often rated in VA or kVA. If your load is rated in kW, you must convert it to VA to ensure you select the correctly sized equipment. Using a unit that is too small can cause overloads or equipment failure.
Yes, 1 kVA = 1000 VA. The calculator shows the result in VA. Simply divide the VA result by 1000 to get kVA. For example, 5000 VA = 5 kVA.
If you cannot find the power factor, use a safe default value of 0.8 for general-purpose equipment or 0.85 for office/household loads. For motors and industrial equipment, it can be as low as 0.6–0.7. Always check the device's nameplate when accuracy matters.
Yes! The formula S(VA) = 1000 × P(kW) / PF applies to both single-phase and three-phase systems when using total power values. The power factor accounts for the phase relationship in the calculation.
A power factor close to 1.0 is ideal, as it means nearly all apparent power is being used as real power. Values above 0.9 are generally considered good. Utility companies may charge a penalty for industrial customers with a PF below 0.85. Power factor correction capacitors can help improve a low PF.
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