kW to Amps Calculator
Convert kilowatts to amps for DC, single-phase or three-phase systems.
Interactive Electrical Calculator
kW to Amps Calculator
Convert kilowatts to amps for DC, single-phase or three-phase systems.
Result
Enter values and calculate.
About the kW to Amps Calculator
The kW to Amps Calculator is a free, browser-based tool for converting between watts, amps, volts, kW, kVA and VA. Convert kilowatts to amps for DC, single-phase or three-phase systems. Power factor and phase count both change the relationship between watts, volt-amps and current, which is where most manual conversion mistakes happen.
It's built for 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, and every field updates instantly so you can try a few scenarios before committing to a real installation.
How the calculation works
Behind the scenes, the calculation follows:
I = (kW × 1000) / (V × PF); three phase divides by √3 as well.
Where each input maps to a field in the calculator above:
- Power in kW.
- 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 5 kW for power, 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 kW to Amps Calculator
Typical reasons people reach for the kW to Amps 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: Three-phase conversions use a √3 factor that single-phase and DC calculations do not, so double check which system you are working with.
Also worth knowing: 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.
Frequently asked questions
What does the kW to Amps Calculator calculate?
Convert kilowatts to amps for DC, single-phase or three-phase systems.
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 kW to Amps Calculator runs entirely in your browser, and nothing you type is transmitted or stored anywhere.
Why does this calculation matter in practice?
Getting a conversion wrong by even a small factor can lead to an oversized bill of materials or, worse, a breaker or cable that is undersized for the real current.
Can I use this on a phone, or does it need a desktop?
The kW to Amps 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.