Power Converter

The Power Converter is a free online tool that converts power values between watts, kilowatts, and horsepower instantly. No sign-up needed — enter a value, choose your units, and get an accurate result. It's a handy reference when comparing appliance ratings, motor specifications, or vehicle engine outputs.

What is a power converter?

Power measures the rate at which energy is used or produced, and different industries prefer different units: electricians and appliance labels use watts and kilowatts, while automotive and mechanical engineering traditionally use horsepower. This tool bridges the two systems instantly, without memorizing conversion factors. Car shoppers and equipment buyers often need to compare a horsepower rating against a wattage figure, which is exactly what this tool simplifies.

How to use the Power Converter

1. Enter the power value you want to convert.
2. Select the unit to convert from — watts, kilowatts, or horsepower.
3. Click Calculate to see the equivalent across units.

Key features

• Supports watts, kilowatts, megawatts and horsepower.
• Useful for engine specs, appliance ratings, and coursework.
• Instant, accurate two-way conversion.
• Free and works directly in your browser.

Related tools

Working with related units? Try the Energy Converter, Torque Converter, or the Current Converter.

Frequently asked questions

Is the Power Converter free?

Yes, it's completely free with no sign-up required. Convert as many values as you need — the tool has no usage limits.

How many watts are in one horsepower?

One mechanical horsepower equals approximately 745.7 watts. This figure is based on the mechanical horsepower definition commonly used in engineering and automotive contexts.

What's the difference between power and energy?

Power is the rate energy is used (watts), while energy is the total amount used over time (like watt-hours) — power tells you "how fast," energy tells you "how much." Watts and kilowatts describe the instantaneous rate, while energy units like kilowatt-hours describe the total consumed over a period.

Where is horsepower still used?

Horsepower remains common for rating car and motorcycle engines, as well as some pumps, motors, and machinery. Some smaller power tools and pumps also still list horsepower ratings alongside their wattage.