About

In many regions (Europe, Asia, South America), the standard voltage for outlets and appliances is 220V to 240V. This calculator is pre-optimized for these single-phase systems, reducing the need for repetitive inputs. It is particularly useful for estimating the load of household appliances or workshop tools on a circuit. To ensure accuracy, the tool allows you to select common appliance types (like motors or heaters) to automatically apply the correct Power Factor, which is often neglected in basic manual calculations.

Formulas

The formula assumes a standard single-phase AC system:

PkW = I × 220 × PF1000

The voltage constant (220) can be adjusted to 230 or 240 in the settings if needed.

Reference Data

Appliance	Typ. Amps (I)	Typ. PF	Voltage	Est. Power (kW)
Elec. Kettle	9.0	1.0	220	1.98 kW
Induction Motor	5.0	0.8	220	0.88 kW
LED Lighting	0.5	0.9	220	0.09 kW
Air Conditioner	12.0	0.85	220	2.24 kW
Welding Machine	25.0	0.7	220	3.85 kW
Space Heater	10.0	1.0	220	2.20 kW
Desktop PC	2.0	0.95	220	0.41 kW
Washing Machine	10.0	0.8	220	1.76 kW

Frequently Asked Questions

Yes. While the tool defaults to 220V, you can manually edit the voltage field to 230V (EU standard) or 240V (UK/Australia standard) to get a precise calculation.

Resistive devices (heaters, toasters, incandescent lights) always have a PF of 1.0. Devices with motors or transformers (fridges, drills, AC units) typically range from 0.7 to 0.9. Use the "Chips" below the input to auto-fill common values.

No. This tool uses the single-phase formula. If you have 3-phase 220V (common in some older industrial setups or specific countries like Brazil/Mexico), you need to multiply the result by 1.732.

If you input 1.0 for a motor that is actually 0.8, you will calculate a higher kW value than reality. However, for wire sizing, this error is often on the safe side, though for energy billing or efficiency analysis, it would be inaccurate.