About the VA to kVA Calculator
This calculator converts VA to kVA. VA is volt-amperes, the apparent power that a supply must deliver, which is voltage times current without regard to power factor, and kVA is a thousand volt-amperes, the apparent power rating of transformers, generators and UPS units. Both are apparent power, so the sum is a division by 1,000. Enter your figures and the answer appears at once, together with a few related values, and you can copy the result with one tap. The sums are done in your browser and nothing is sent anywhere.
Updated October 2026
How to use the VA to kVA Calculator
- 1Enter the value in VA.
- 2Fill in the other boxes that the VA to kVA calculation needs, such as time, voltage or power factor.
- 3Read the answer in the large result box.
- 4Check the extra rows for related values.
- 5Press Copy result to keep it.
When you need VA to kVA
UPS units and small power supplies are labelled in VA, while panel boards, transformers and generators use kVA. When you add loads together or compare a unit with a bigger one, you must use the same prefix. Dividing the VA figure by a thousand gives kVA.
It is handy when planning a server cabinet, where the sum of the VA ratings of devices is compared to the kVA of a distribution unit, or when reading catalogue pages that list the same product in both units.
How the VA to kVA sum works
kVA = VA ÷ 1,000. A UPS rated at 2,500 VA is a 2,500 ÷ 1,000 = 2.5 kVA unit.
The displayed answer is rounded to six significant figures, but the sum itself is not rounded, so converting VA to kVA and back again gives you the number you started with.
- Divide by 1,000
- Same type of power on both sides
- Convert to watts with the power factor
Mistakes to avoid when converting VA to kVA
Be careful not to confuse VA with watts. A 1,000 VA UPS usually delivers less than 1,000 W, because the power factor is below 1. This calculator only changes the unit prefix of apparent power.
On phone and computer
On a phone, type in the boxes one after another and read the kVA result underneath; the Copy button puts it on the clipboard for a message or a note. On a computer the inputs sit on the left and the answer on the right, so you can change one figure and watch the kVA value move. The VA to kVA page works the same on both. The opposite step is kVA to VA Calculator, and VA to kW Calculator gives real power. VA to Watts Calculator works in smaller units, and Power Converter changes power units.
Features
- VA to kVA in one step
- Related values shown with the answer
- Clear messages for impossible inputs
- Copy the result with one tap
- Private: nothing is uploaded
- Works on phone and computer
Frequently asked questions
How do I convert VA to kVA?
kVA = VA ÷ 1,000. A UPS rated at 2,500 VA is a 2,500 ÷ 1,000 = 2.5 kVA unit.
What is the formula for VA to kVA?
kVA = VA ÷ 1,000. The calculator applies it exactly and rounds only the displayed answer.
What is the difference between VA and kVA?
VA is volt-amperes, the apparent power that a supply must deliver, which is voltage times current without regard to power factor. kVA is a thousand volt-amperes, the apparent power rating of transformers, generators and UPS units. They measure different things, which is why converting from VA to kVA needs more than a simple multiplication in some cases.
How many kVA is 1,000 VA?
1,000 VA is 1 kVA.
How do I get from VA to watts?
Multiply the VA by the power factor. For 1,000 VA at 0.8 the real power is 800 W. Use the VA to kW calculator for that.
Is this VA to kVA calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so the figures you type are not uploaded or stored. It is meant for planning and learning; for wiring or safety work, check the result against your equipment's rating plate and local rules.