About the VA to kW Calculator
This calculator converts VA to kW. VA is volt-amperes, the apparent power that a supply must deliver, which is voltage times current without regard to power factor, and kW is a thousand watts, the usual way to rate motors, heaters, air conditioners and generators. It multiplies the VA by the power factor and divides 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 kW Calculator
- 1Enter the value in VA.
- 2Fill in the other boxes that the VA to kW 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 kW
A UPS rated at 1,500 VA does not give 1,500 W. The real power it can give is the VA rating multiplied by its power factor, which is often between 0.6 and 0.9. This calculator turns the VA rating into the kilowatts you can actually run.
It is useful for comparing products with different labels, for checking how many devices a unit can carry, and for estimating the output of a generator that is rated only in VA.
How the VA to kW sum works
kW = VA × power factor ÷ 1,000. A 1,500 VA supply at a power factor of 0.9 can deliver 1,500 × 0.9 ÷ 1,000 = 1.35 kW.
The displayed answer is rounded to six significant figures, but the sum itself is not rounded, so converting VA to kW and back again gives you the number you started with.
- Typical UPS power factor: 0.6 to 0.9
- Look for the watt rating on the label
- Do not treat VA as W
Mistakes to avoid when converting VA to kW
The biggest mistake is to treat VA as watts. Equipment with a low power factor can carry far fewer watts than its VA rating suggests. Look for the watt rating on the label, and use this tool if only the VA is given.
On phone and computer
On a phone, type in the boxes one after another and read the kW 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 kW value move. The VA to kW page works the same on both. Compare it with kVA to kW Calculator for large loads, VA to Watts Calculator for small ones, and VA to kVA Calculator for rating plates. Power Factor Calculator finds the factor if the label does not show it.
Features
- VA to kW 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 kW?
kW = VA × power factor ÷ 1,000. A 1,500 VA supply at a power factor of 0.9 can deliver 1,500 × 0.9 ÷ 1,000 = 1.35 kW.
What is the formula for VA to kW?
kW = VA × power factor ÷ 1,000. The calculator applies it exactly and rounds only the displayed answer.
What is the difference between VA and kW?
VA is volt-amperes, the apparent power that a supply must deliver, which is voltage times current without regard to power factor. kW is a thousand watts, the usual way to rate motors, heaters, air conditioners and generators. They measure different things, which is why converting from VA to kW needs more than a simple multiplication in some cases.
How many kW is 1,000 VA?
At a power factor of 0.8 it is 0.8 kW, at 0.9 it is 0.9 kW and at 1 it is 1 kW.
Is the answer the continuous or the peak power?
It uses the VA rating you enter. If that rating is a continuous rating, the answer is the continuous real power.
Is this VA to kW 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.