Energy & Power Converters — Joules, kW, Horsepower
Free online energy and power converter — instantly switch between joules, calories, kilowatts, horsepower and kilowatt-hours for engineering and physics.
Free
No registration
Instant results
Mobile friendly
Frequently Asked Questions
This category currently includes 3 free tools: Joules to Calories, Kilowatts to Horsepower, kWh to Megajoules.
Yes, every tool is completely free, works instantly in your browser, and requires no registration or sign-up.
All calculations use precise mathematical formulas and are shown with up to 6 significant digits of precision.
No installation is required — everything runs directly in your web browser, on desktop or mobile.