Power Converter
Convert watts, kilowatts and horsepower.
✓ Professional standard Uses precise SI and internationally agreed conversion factors for accurate, standards-based results.
Power Converter is a free online converter from Toolinza. Convert watts, kilowatts and horsepower. It runs entirely in your browser — your data is never uploaded — needs no signup, and works on any device. Toolinza offers 293+ free tools used by people across the UK, USA, Canada, Australia, the EU, India, Pakistan, the Middle East and worldwide.
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About the Power Converter
Power ratings appear as watts on appliances, kilowatts on machinery and horsepower on engines — and comparing them means converting. Whether you are checking a motor, an appliance or a car, a converter makes the numbers comparable.
This Power Converter switches between watts, kilowatts and horsepower using exact factors, so ratings from different sources line up.
How to use the Power Converter
- Enter the power value.
- Choose the unit you are converting from.
- Choose the unit you are converting to.
- Read the converted power instantly.
Key features of the Power Converter
- Converts watts, kilowatts and horsepower
- Exact conversion factors
- Two-way conversion
- Useful for engines and appliances
- Private — calculated in your browser
How the Power Converter works
Every conversion uses the exact, internationally agreed factors defined by the International System of Units (SI) and recognised standards bodies. Temperature conversions apply the correct formulas rather than simple multipliers, and results retain full precision so they are suitable for scientific, engineering and everyday use alike.
All conversions are calculated instantly in your browser.
Tips & best practices
- A useful anchor: one horsepower is about 746 watts, or roughly 0.75 kW.
- Car makers often quote power in different units by market, so convert to compare like with like.
- Keep power and energy separate — watts measure rate, while kWh measures total energy used.
Standards & accuracy
Uses precise SI and internationally agreed conversion factors for accurate, standards-based results.
Results are accurate to standard conversion factors. For everyday use you can round sensibly; for scientific, medical or engineering work, keep the full precision the tool provides.
Who uses the Power Converter?
- Comparing engine power in hp and kW
- Checking appliance and motor ratings
- Engineering and electrical work
- Study and homework
Privacy & security
The Power Converter runs entirely inside your web browser. Your data — whether that is a file, figures or text — is processed on your own device and is never uploaded to a server, stored or shared. There is no signup and no account, so you can use it as often as you like while keeping full control of your information. This makes it a safe choice even for confidential and sensitive work.
Why choose Toolinza?
- 100% free — no hidden charges, watermarks or usage caps.
- Private & secure — your data stays on your device.
- Standards-compliant — accurate results suitable for the UK, USA, Canada, Australia, EU, India, Pakistan, the Middle East and worldwide.
- Works everywhere — desktop, tablet and mobile.
Frequently asked questions
One mechanical horsepower is about 746 watts, or roughly 0.75 kilowatts. The converter uses the exact factor.
Yes. It converts between watts, kilowatts and horsepower in any direction.
Power (watts) is the rate of using energy, while energy (such as kWh) is the total amount used over time.
Yes. The Power Converter is completely free with no signup, no watermarks and no usage limits. Toolinza is supported by unobtrusive advertising so every tool stays free.
Absolutely. This tool runs entirely in your browser — your data and files are never uploaded to any server, so everything stays private on your own device.
No. The Power Converter works instantly in any modern web browser on desktop, tablet and mobile — Windows, macOS, Linux, Android and iOS.