Power Converter
Convert between watts, kilowatts, horsepower, BTU/hr, and more.
Ready to calculate?
› Open the Unit ConverterBackground
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
- Select 'Power'
Choose the category from the dropdown.
- Select your source unit
Pick the unit you're converting from.
- Enter the value
Type the number. Results update instantly.
- 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).
Electronics Recycling
Our power converter tool is also useful for electronics recycling. By converting the power consumption of different electronic devices, you can determine which devices are most energy-efficient and which ones to prioritize for recycling.
Frequently Asked Questions
How do you convert HP to kW?
Multiply mechanical HP by 0.7457. 150 HP = 111.86 kW. Metric HP: ×0.7355.
How many watts does a household use?
Average: 1.5–2.5 kW continuous, 15–20 kWh/day. Peak: 5–8 kW.
What is BTU/hr in watts?
Divide by 3.412. 10,000 BTU/hr ≈ 2,931 W ≈ 2.9 kW.
Can I convert between different units of power consumption?
Yes, our power converter tool allows you to convert between different units of power consumption, including watts (W), kilowatts (kW), megawatts (MW), and more.
How do I calculate the cost of electricity for a specific device?
To calculate the cost of electricity for a specific device, simply enter the device's power consumption in watts and the cost of electricity in your area. Our tool will automatically display the cost in dollars or other currency.