Amps to kW Calculator
Convert electrical current to kilowatts.
Interactive Electrical Calculator
Amps to kW Calculator
Convert electrical current to kilowatts.
Result
Enter values and calculate.
About the Amps to kW Calculator
Use the Amps to kW Calculator below to work through converting between watts, amps, volts, kW, kVA and VA in seconds, right in your browser. Convert electrical current to kilowatts. Equipment nameplates, breaker ratings, generator ratings and utility bills rarely all use the same unit, so converting correctly is a routine step in almost every electrical job.
Electricians sizing breakers and cable, solar and generator installers matching equipment ratings, and anyone reading a nameplate that lists one unit when they need another typically reach for a tool like this to double-check a number before it goes into a real installation.
How the calculation works
The calculator is built around this relationship:
kW = V × I × PF / 1000; three phase multiplies by √3.
Where each input maps to a field in the calculator above:
- Current in A.
- Voltage in V.
- Power Factor.
- System — choose between DC, Single Phase, Three Phase.
You can adjust any of these values as many times as you like; the result updates on every change with nothing sent off your device.
A worked example
For example, start with 20 A for current, 230 V for voltage and 0.9 for power factor. Those defaults are only a starting point — replace them with your own measured or nameplate values, then press Calculate to get a result specific to your situation.
When to use the Amps to kW Calculator
Typical reasons people reach for the Amps to kW Calculator:
- Converting a nameplate wattage to the amp draw needed to size a breaker or extension cord.
- Turning a generator or UPS kVA rating into the real kW load it can actually support.
- Checking a utility bill or inverter spec sheet that mixes kW, kWh and kVA.
- Working out current draw for a three-phase motor or panel from its power rating.
Good practice: A typical inductive load (motors, transformers, some electronics) has a power factor below 1, which means its current draw is higher than a simple watts ÷ volts calculation suggests.
Also worth knowing: Always check whether the source rating is real power (W/kW) or apparent power (VA/kVA) before converting — they are only equal when power factor is exactly 1.
Frequently asked questions
What does the Amps to kW Calculator calculate?
Convert electrical current to kilowatts.
Is the result exact enough to build from?
The formula above is applied exactly to the values you enter, so the math itself is precise. Real-world results can still differ due to component tolerances, temperature, installation method, equipment efficiency and local code requirements, so treat the output as a strong planning estimate and verify final designs against manufacturer data and the electrical code that applies to your installation.
Does this calculator store or send my data anywhere?
No. The Amps to kW Calculator runs entirely in your browser, and nothing you type is transmitted or stored anywhere.
What happens if I get this wrong?
Power factor and phase count both change the relationship between watts, volt-amps and current, which is where most manual conversion mistakes happen.
What should I do if the result looks off?
The Amps to kW Calculator works on any modern browser, phone or desktop, and recalculates as soon as you press Calculate. If a result looks off, double-check that every field is filled in with the unit shown next to it (mixing up units, such as W with kW, is the most common cause of an unexpected answer) and re-enter the values.