About the kVA to Amps Calculator
This calculator converts kVA to A. kVA is a thousand volt-amperes, the apparent power rating of transformers, generators and UPS units, and A is amperes, the flow of electric current. The current is the apparent power divided by the voltage, with an extra factor of √3 for three-phase supplies. 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 kVA to Amps Calculator
- 1Enter the value in kVA.
- 2Fill in the other boxes that the kVA to A 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 kVA to A
The kVA rating of a transformer or generator tells you its capacity, but wires, fuses and breakers are chosen by current. Converting kVA to amps gives the full-load current that the supply can deliver, and so the size of the protective devices that match it.
Use the single-phase option for home supplies and small units, and the three-phase option with the line voltage for industrial equipment. No power factor is needed because kVA is already apparent power, which is exactly what the wires carry.
How the kVA to A sum works
Single-phase: amps = kVA × 1,000 ÷ volts. Three-phase: amps = kVA × 1,000 ÷ (√3 × volts). A 15 kVA three-phase supply at 400 V carries 15,000 ÷ (1.732 × 400) = 21.65 A in each line.
The displayed answer is rounded to six significant figures, but the sum itself is not rounded, so converting kVA to A and back again gives you the number you started with.
- Three-phase uses the line voltage
- No power factor needed
- Add a margin for breakers
Mistakes to avoid when converting kVA to A
A frequent error is to use the single-phase formula for a three-phase supply, which gives a current 1.73 times too high. Another is to use the phase voltage instead of the line voltage. Check which voltage the rating plate shows.
On phone and computer
On a phone, type in the boxes one after another and read the A 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 A value move. The kVA to A page works the same on both. If the load is smaller, VA to Amps Calculator works the same way, and kW to Amps Calculator uses real power. Go the other way with Amps to kVA Calculator, and switch to real power with kVA to kW Calculator.
Features
- kVA to A 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 kVA to A?
Single-phase: amps = kVA × 1,000 ÷ volts. Three-phase: amps = kVA × 1,000 ÷ (√3 × volts). A 15 kVA three-phase supply at 400 V carries 15,000 ÷ (1.732 × 400) = 21.65 A in each line.
What is the formula for kVA to A?
Single-phase: amps = kVA × 1,000 ÷ volts. Three-phase: amps = kVA × 1,000 ÷ (√3 × volts). The calculator applies it exactly and rounds only the displayed answer.
What is the difference between kVA and A?
kVA is a thousand volt-amperes, the apparent power rating of transformers, generators and UPS units. A is amperes, the flow of electric current. They measure different things, which is why converting from kVA to A needs more than a simple multiplication in some cases.
How many amps is 1 kVA at 230 volts?
On a single-phase supply, 1,000 ÷ 230 = 4.35 A.
Do I need the power factor?
No. kVA is apparent power, so the current follows directly from the voltage. The power factor only matters when converting to kW.
Is this kVA to A 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.