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Power Converter
Free Online Power Converter — The Complete Guide
Everything you need to convert between Watts, Kilowatts, Horsepower, BTU/hr and 7+ more power units in seconds — with engineer-grade accuracy, zero installation, and nothing ever leaving your browser.
- ✓ No installation
- ✓ Zero data stored
- ✓ Unlimited conversions
- ✓ Works on all devices
How to Convert Power Units in 4 Simple Steps
No tutorials or manuals required. The entire workflow takes less than ten seconds.
- Step 1
Open the Power Converter
Navigate to okemall.com/power-converter. The tool loads instantly — nothing to install, no account to create.
- Step 2
Select the "From" Unit
Choose the unit your value is currently in — Watts, Horsepower, BTU/hr and more — from the first dropdown menu.
- Step 3
Enter Value & Choose "To" Unit
Type the number you want to convert, then pick your target unit — or use the swap button to reverse direction instantly.
- Step 4
Get & Copy Your Result
Receive a precision, standardized result immediately and copy it with one click. Repeat as often as you like — completely free.
Built for Accuracy. Designed for Speed.
Every detail is engineered for a fast, private and dependable conversion experience.
Lightning Fast
Results appear the instant you type. No page reloads, no waiting, no delays.
100% Free Forever
Unlimited conversions at zero cost. No premium tiers, no paywalls, no limits.
Secure & Private
Every calculation runs locally in your browser. Your values never touch a server.
Cross-Platform
Consistent performance on Windows, macOS, Linux, Android and iOS.
No Installation
Entirely web-based. Open the page and start converting — nothing to download.
11 Units Supported
Milliwatts to gigawatts, both horsepower variants, BTU/hr and refrigeration tons.
Engineer-Grade Precision
Standardized factors (1 hp = 745.699872 W) with 6-significant-digit results.
Intuitive Interface
Clear fields, one-click swap, instant copy. No learning curve whatsoever.
Why Professionals Rely on Okemall
Power is measured differently across industries, regions and disciplines — and manual conversion invites costly errors. An electrician sizing a circuit needs kilowatts expressed in BTU/hr. A vehicle engineer comparing US and European specification sheets must translate mechanical hp to metric PS. An HVAC technician works daily with tons of refrigeration and watts. Misremembered conversion factors lead to expensive mistakes — Okemall eliminates the guesswork.
With standardized precision, a zero-friction interface and complete privacy by design, it is the fastest way to move between any two power measurements with total confidence — professional-grade utility, made effortless.
Students & Researchers
Verify physics and engineering homework, lab reports and thesis calculations in seconds.
Engineers & Technicians
Electricians, HVAC contractors, mechanical engineers and solar installers get accurate on-site conversions.
Creators & Smart Buyers
Decode appliance ratings, generator capacities and EV motor outputs when comparing products across regions.
Frequently Asked Questions
Everything you need to know before you convert.
Is the Okemall Power Converter free to use? ▾
Yes — completely. The tool is 100% free with unlimited conversions. No subscriptions, no registration, and no hidden fees of any kind.
Is my data secure when using this tool? ▾
Absolutely. Every conversion is calculated locally in your browser with JavaScript. Your input values are never sent to, stored on, or logged by our servers.
Which power units does the converter support? ▾
Eleven units, including Watts (W), Milliwatts, Kilowatts (kW), Megawatts (MW), Gigawatts (GW), mechanical Horsepower (hp), metric Horsepower (PS), BTU/hour, foot-pounds per second, calories per second, and tons of refrigeration.
How accurate are the power conversions? ▾
Conversions use internationally standardized factors — e.g., 1 mechanical hp = 745.699872 W and 1 BTU/hr ≈ 0.29307107 W — displayed to 6 significant digits, suitable for academic and professional applications.
Can I use it on my mobile phone or tablet? ▾
Yes. The converter is fully responsive and optimized for all screen sizes — iPhone, Android, tablet and desktop — with no app download required.
What is the difference between mechanical and metric horsepower? ▾
Mechanical (imperial) horsepower, common in the US and UK, equals 745.699872 watts. Metric horsepower (PS or CV), used in Europe and Asia, equals 735.49875 watts. The converter supports both — simply select the correct variant.
Is there a limit on how many conversions I can perform? ▾
None. There are no daily limits, usage caps, or rate restrictions. Convert as many values as you need, as often as you need.
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