kW to Amperes Calculator
Input your power in kilowatts and system voltage to get the exact current draw. Perfect for industrial motor sizing and residential circuit planning.
Input Parameters
DC & AC Support
Result updates in real-time as you enter parameters.
The Conversion Formula
Depending on your circuit type, the math changes significantly.
DC Systems
I = (kW × 1000) / V Simple power over voltage. Used for battery banks and solar arrays.
1-Phase AC
I = (kW × 1000) / (V × PF) Residential standard. Power factor accounts for motor efficiency.
3-Phase AC
I = (kW × 1000) / (√3 × V × PF) Industrial standard. Square root of 3 (1.732) is mandatory.
How to Convert Kilowatts to Amperes
Converting kW to amps is essential for ensuring that your wiring and circuit breakers can handle the load. A kilowatt (kW) is a measure of power, while an ampere (A) is a measure of current flow. Because voltage and the type of electrical system (DC or AC) vary, there is no single constant for conversion.
Key Takeaway
Higher voltage allows for lower current draw at the same kilowatt rating. This is why industrial machinery often runs at 480V—it reduces the wire size required for the same amount of work.
Step-by-Step Conversion Guide
- Identify the Power: Note the kW rating from your equipment nameplate.
- Check the Voltage: Confirm if you are running on 120V, 240V, or 480V.
- Determine Phase: Is it a simple battery (DC), home appliance (1-Phase), or big motor (3-Phase)?
- Input & Calculate: Use our tool above to get instant results, or apply the formulas manually.