What's the difference between watts and horsepower?

Watts and horsepower both measure power but use different systems. Watts (W) are the SI unit for power, while horsepower (hp) is a traditional unit still used for engines and motors. 1 mechanical horsepower = 745.7 watts. Electrical horsepower (used for motors) is slightly different at 746 watts. Our converter uses the standard mechanical conversion factor.

When should I use kilowatts vs horsepower?

Use kilowatts (kW) for electrical measurements, solar panels, HVAC systems, and most modern engineering applications as it's the SI standard. Use horsepower (hp) for automotive engines, industrial machinery, boat motors, and legacy equipment specifications. The choice often depends on your industry and location.

How do I convert kW to HP?

To convert kilowatts to horsepower, multiply by 1.341. For example, 10 kW × 1.341 = 13.41 HP. To convert HP to kW, divide by 1.341 or multiply by 0.7457. Our converter handles these calculations automatically with full precision between all units.

What's a typical power consumption for household items?

LED light bulb: 5-15W. Laptop: 50-100W. Microwave: 1000W. Electric heater: 1500-3000W. Air conditioner: 1000-3500W. Electric vehicle charger: 7000-22000W (7-22 kW). Understanding these helps with electrical planning and energy monitoring.

Why do engines use horsepower instead of kilowatts?

Horsepower is a historical unit that originated with James Watt to help market steam engines by comparing them to horse power. It persisted in automotive and industrial applications due to familiarity and industry standards. While most modern engineering uses kilowatts, horsepower remains common in consumer-facing automotive specifications and legacy equipment.

Can I use this for calculating electricity costs?

Yes, but remember that electricity bills typically use kilowatts multiplied by time (kWh). Our converter helps you understand power ratings of appliances, but you'll need to multiply by usage hours to calculate energy consumption and costs. For example, a 2kW heater used for 3 hours consumes 6 kWh.

Power Unit Converter

Convert power measurements between watts, kilowatts, and horsepower for electrical and mechanical applications

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Convert between watts, kilowatts, and horsepower.

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How it works: Converts power units between watts (SI), kilowatts, and horsepower. 1 kW = 1000 W. 1 hp = 745.7 W (mechanical horsepower).

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