Introduction
This Amps to kVA calculator helps you convert electric current in amperes (A) to apparent power in kilovolt-amps (kVA). All you need to do is enter the current and voltage, pick your phase type, and the tool does the math for you right away. It works for both single phase and three phase systems, including line-to-line and line-to-neutral voltage setups.
Knowing the apparent power in kVA is important when you size generators, transformers, or other electrical equipment. The formulas are simple. For single phase, you multiply amps by volts and divide by 1,000. For three phase with line-to-line voltage, you multiply amps by volts by √3, then divide by 1,000. For three phase with line-to-neutral voltage, you multiply amps by volts by 3, then divide by 1,000. This calculator uses those exact formulas and shows you a full breakdown of each step so you can check the work yourself. If you need to do the reverse conversion, our kVA to Amps calculator handles that.
How to Use Our Amps to kVA Calculator
Enter your current and voltage values below, and this calculator will instantly give you the apparent power in kilovolt-amps (kVA).
Phase Type: Pick either Single Phase or Three Phase. Most homes use single phase. Most large machines and buildings use three phase. If you need to calculate full three-phase power including power factor, try our 3 Phase Power calculator.
Voltage Type (Three Phase only): If you chose three phase, select Line-to-Line or Line-to-Neutral. Line-to-Line is measured between two power lines. Line-to-Neutral is measured from one line to the neutral wire.
Current (A): Type in the current in amps. You can find this number on your device's nameplate or from a clamp meter reading. If you need to determine the current from other values first, our Amp calculator can help.
Voltage (V): Type in the voltage in volts. Common values are 120 V, 208 V, 230 V, 240 V, 277 V, and 480 V. You can verify voltage relationships across circuits using our Voltage Divider calculator.
Calculate: Press the Calculate button to see your result. The calculator shows the apparent power in kVA along with the formula and a full breakdown of the math.
Amps to kVA Conversion Explained
This calculator converts amps (A) to kilovolt-amps (kVA). Amps measure how much electric current flows through a wire. kVA measures apparent power, which is the total power a device or circuit uses. You need to know both the current in amps and the voltage in volts to find the apparent power in kVA.
How the Conversion Works
For single-phase circuits, you multiply amps by volts, then divide by 1,000. This gives you the apparent power in kVA. The formula is: kVA = (Amps × Volts) / 1,000.
For three-phase circuits, the math changes depending on how voltage is measured. If you use line-to-line voltage, you multiply amps by volts by √3 (about 1.732), then divide by 1,000. If you use line-to-neutral voltage, you multiply amps by volts by 3, then divide by 1,000.
When You Need This Conversion
Electricians, engineers, and technicians use this conversion when sizing generators, transformers, and electrical panels. Knowing the kVA rating helps you pick equipment that can handle the electrical load safely. For example, if a building draws 100 amps at 240 volts on a single-phase system, it needs at least 24 kVA of capacity. Our Generator Sizing calculator can help you determine the right generator for your load requirements.
kVA vs. kW
kVA and kW are not the same thing. kVA is apparent power, while kW is real power — the power that actually does useful work. The difference between them depends on the power factor, which shows how efficiently a circuit uses electricity. In a perfect system, kVA and kW are equal. In real systems, kVA is always equal to or greater than kW. You can explore the relationship between amps and watts using our Amps to Watts calculator, or convert in the other direction with our Watts to Amps calculator. For a deeper understanding of electrical fundamentals like voltage, current, resistance, and power, our Ohm's Law calculator is a great resource. If you're also checking wire capacity and voltage loss over long cable runs, our Voltage Drop calculator is essential for safe circuit design.