kW to kVA Calculator
This kW to kVA calculator converts real power in kilowatts to apparent power in kVA using the power factor. Enter the kW and the power factor and the kW to kVA calculator returns the kVA. The kW to kVA conversion divides the real power by the power factor, which is why apparent power is always equal to or larger than the real power.
Results
The kW to kVA Calculator is part of our AC & Three Phase collection. Browse more ac & three phase to size, convert, and check your work alongside this tool.
What the kW to kVA calculator does
Kilowatts measure the real power that does work, while kVA measures the apparent power a supply must deliver. This kW to kVA calculator converts between them using the power factor. Because some current in an AC system does no useful work, the kVA is larger than the kW unless the power factor is a perfect 1.0. The kW to kVA conversion is essential for sizing generators, transformers, and supplies.
How the kW to kVA conversion works
The kW to kVA conversion divides real power by the power factor:
Power factor is the ratio of real power to apparent power, so dividing by it scales the kW up to the kVA. When the power factor is 1.0, the kVA equals the kW; as the power factor falls, the kVA rises. This is why the kilowatt to kVA conversion always gives a kVA equal to or greater than the kW, and why a poor power factor forces a larger supply.
kW to kVA conversion example
A load of 10 kW at a power factor of 0.8. To calculate kW to kVA:
So a supply must deliver 12.5 kVA to do 10 kW of work at that power factor. Enter your own values and the kW to kVA calculator returns the kVA, matching a kW to kVA chart.
How to use the kW to kVA calculator
Enter the real power in kilowatts and the power factor of the load. The kW to kVA calculator divides the kW by the power factor to give the kVA. If you do not know the exact power factor, 0.8 is a common default for mixed loads. This convert kW to kVA calculator works the same for single-phase and three-phase, since power factor is what links the two, and the conversion of kilowatt to kVA is identical either way.
Reading the kW to kVA calculator result
The kVA is what you size the generator, transformer, or cable to, because the supply has to carry the full apparent power even though only the kW does work. The gap between them is the power factor: at 0.8, you need 25% more kVA than kW. Generators are rated in kVA for exactly this reason. Use the kW to kVA calculator result to pick equipment that will not be overloaded by a low power factor.
When to use the kW to kVA calculator
- Sizing a generator from a kW load with the kW to kVA conversion
- Rating a transformer with the convert kW to kVA calculator
- Checking supply capacity with the kilowatt to kVA conversion
- Reading equipment specs against a kw in kva calculator
Common kW to kVA conversion mistakes
- Assuming kVA equals kW. Only when the power factor is 1.0; the kW to kVA conversion scales up for anything less.
- Guessing the power factor. Use the real value; a wrong factor throws off the kVA.
- Sizing on kW. Generators and transformers must be rated in kVA, from the kW to kVA calculator.
Tips for accurate results
- Use the actual power factor in the kW to kVA calculator, not an assumed 1.0.
- Size generators and transformers on the kVA, with headroom above the load.
- Consider power factor correction if the conversion shows a large kW to kVA gap.
Why the kW to kVA conversion matters for sizing
The whole point of the kW to kVA conversion is equipment sizing. A load described in kW tells you the useful work, but the generator, transformer, cable, and switchgear all have to handle the apparent power in kVA, which is larger whenever the power factor is below one. Size any of them on the kW alone and a low power factor will overload them, because the extra reactive current is real current flowing through the copper even though it does no work. This is why every generator and UPS is rated in kVA, and why the kW to kVA calculator is the first step in specifying a supply: convert the load to kVA, then pick equipment with headroom above it.
The kW to kVA conversion calculator and power factor
Everything in the kilowatt to kVA conversion hinges on the power factor. A resistive load like a heater has a power factor near 1.0, so its kVA barely exceeds its kW. A motor or a load full of electronics has a lower power factor, often 0.7 to 0.85, so it needs noticeably more kVA for the same kW. Poor power factor wastes supply capacity, which is why utilities charge large users for it and why power factor correction, adding capacitors to raise the factor, pays for itself. When you run the convert kW to kVA calculator, using the real power factor rather than an optimistic guess is what makes the kVA figure trustworthy.
kW to kVA chart
The kW to kVA conversion at common power factors, from the kW to kVA calculator:
| Real power | PF 0.8 | PF 0.9 | PF 1.0 |
|---|---|---|---|
| 5 kW | 6.25 kVA | 5.56 kVA | 5.0 kVA |
| 10 kW | 12.5 kVA | 11.1 kVA | 10.0 kVA |
| 50 kW | 62.5 kVA | 55.6 kVA | 50.0 kVA |
| 100 kW | 125 kVA | 111 kVA | 100 kVA |
kW to kVA Calculator FAQ
How do I convert kW to kVA?
Divide the kilowatts by the power factor: kVA = kW / PF. The kW to kVA calculator does this kW to kVA conversion instantly once you enter the power factor.
Why is kVA higher than kW?
Because some current in an AC system does no useful work. The power factor is below 1.0 for most loads, so the kilowatt to kVA conversion scales the kW up to a larger kVA.
What power factor should I use?
Use the actual value from the equipment if you have it; 0.8 is a common default for mixed loads. The convert kW to kVA calculator uses whatever you enter.
Why are generators rated in kVA?
Because a generator must supply the full apparent power, not just the real power. Sizing it in kVA with the kW to kVA calculator prevents overload at a low power factor.