Background

Power is the rate of energy transfer. Watts (SI), kilowatts (electricity), horsepower (engines), BTU/hr (HVAC). Converting is essential for comparing engines and sizing equipment.

Watt, Kilowatt, Megawatt

1 kW = 1,000 W. 1 MW = 1,000,000 W. Household: 1–3 kW avg. Car: 75–150 kW. Power station: hundreds of MW.

Mechanical vs Electrical HP

Mechanical HP = 745.7 W. Metric HP (PS) = 735.5 W. Boiler HP = 9,810 W.

How to Use This Calculator

1. Select 'Power'

   Choose the category from the dropdown.

2. Select your source unit

   Pick the unit you're converting from.

3. Enter the value

   Type the number. Results update instantly.

4. Select your target unit

   Choose the unit you need.

Applications

Automotive

200 HP = 149 kW. EU specs use kW; US uses HP.

Electrical Appliances

Kettle: ~2 kW. Heater: ~2.4 kW. LED bulb: ~10 W. Converting estimates electricity costs.

Solar Energy

Residential panel: 300–400 W. System sizes in kW (e.g. 6.6 kW).

Frequently Asked Questions