Power Converter
Convert between watts, kilowatts, horsepower, and BTU.
⚡ Engine power in hp, electrical in kW, large plants in MW. 1 hp ≈ 746 W.
What Is This Tool?
Power is the rate of energy use — one watt = one joule per second. This tool converts between watts, kilowatts, horsepower, BTU/sec, and more.
Key Conversions
- 1 horsepower (hp) ≈ 745.7 watts
- 1 metric horsepower (PS) ≈ 735.5 watts
- 1 kilowatt (kW) = 1000 watts
- 1 BTU/sec ≈ 1055 watts (for heating/cooling)
Real-World Power
- LED bulb: 10 W
- Microwave: 1000 W (1 kW)
- Typical car engine: 100-200 hp (75-150 kW)
- Home electric usage: ~1-2 kW average, ~10-30 kW peak
- Small nuclear reactor: ~1 GW (1,000,000 kW)
Frequently Asked Questions
Why two horsepowers?
Mechanical horsepower (hp, ~746 W) originated with James Watt. Metric horsepower (PS, ~735 W) is the European equivalent. Cars sold in Europe are rated in PS; US cars in hp. The difference is ~1.4%.
About the Power Converter
The Power Converter converts power converterfrom one unit to another using the exact internationally defined conversion factors. Type a value, choose your source and target units, and the converted result is shown instantly — no waiting, no page reload.
Manual conversion is error-prone because it means memorizing ratios (how many feet in a meter, how many pints in a liter). This tool removes that friction: the conversion factor is built in, and the math is done to full precision with no rounding until the final displayed number.
How to Use This Tool
- Enter the value you want to convert in the input field.
- Select the unit you are converting from.
- Select the unit you want to convert to.
- The converted value appears instantly. Adjust either unit to compare across the board.
- Copy the result if you need it elsewhere. Your input is never sent anywhere.
Why Use an Online Converter?
Browser-based tools like this one have a few real advantages over installed software or manual methods:
- No installation. It opens instantly in any browser, on any operating system.
- Private by default. Everything runs locally, so your data stays on your device.
- Always up to date.There's nothing to update — you always get the latest version when you load the page.
- Free and unlimited. Use it as often as you like, with no account and no caps.
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