What this calculator actually does
Kilowatts measure real power while amps measure current, so voltage and system type are required to relate them. AC calculations also need the load power factor, and balanced three-phase current uses line-to-line voltage with the √3 factor.
How to use this calculator
Choose the electrical system.
Enter real power in kW and the applicable voltage; for AC, enter the equipment power factor.
Review calculated current and verify the voltage convention before using the number elsewhere.
Where people use it
- •Early electrical load calculations
- •Comparing current at different voltages
- •Checking equipment power/current relationships
Example: 2.3 kW at 230 V, PF 1
2.3 kW is 2,300 W. For single-phase PF 1, 2,300 ÷ 230 = 10 A.
Assumptions and limits
- •Do not use calculated current alone to choose cable or protection. Installation design depends on code, conductor, ambient, starting current and other factors.
- •Three-phase mode assumes a balanced load and line-to-line voltage.
Frequently asked questions
Why multiply kW by 1000?+
One kilowatt equals 1,000 watts, and the electrical power formulas use watts.
Can I calculate three-phase current?+
Yes, for a balanced three-phase load when line-to-line voltage and power factor are known.
Why can two 5 kW loads draw different current?+
Different voltage, phase configuration, power factor and efficiency can change current.
Semantic next steps
Continue the calculation
These links move to a different input, formula or project stage rather than a keyword variation of this page.
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