Energy Converter

Free online energy converter. Easily convert between joules, calories, kilowatt-hours (kWh), electron volts, and more with our accurate and user-friendly tool.

Energy Converter

Convert between different units of measurement

About Energy Conversion

Energy conversion is the process of changing a measurement from one unit of energy to another. The most common units are joules, calories, kilowatt-hours (kWh), and British thermal units (BTU). This is particularly useful in physics, engineering, and everyday energy consumption calculations.

Common Energy Units

  • SI Units: Joule (J), Kilojoule (kJ), Megajoule (MJ)
  • Common Units: Calorie (cal), Kilocalorie (kcal), Kilowatt-hour (kWh)
  • Other: British Thermal Unit (BTU), Electron Volt (eV), Foot-pound (ft⋅lb)

Conversion Formulas

  • 1 joule = 0.239006 calories
  • 1 calorie = 4.184 joules
  • 1 kWh = 3,600,000 joules
  • 1 eV = 1.60218e-19 joules
  • 1 BTU = 1055.06 joules

Historical Context

Energy measurements have evolved with our understanding of physics and technology. The joule, named after James Prescott Joule, became the SI unit for energy in 1948. The calorie, originally defined as the energy needed to heat water, remains popular in nutrition. The kilowatt-hour, developed with the rise of electrical power, is commonly used for utility billing. The electron volt, used in particle physics, represents the energy gained by an electron moving through a potential difference of one volt.

Common Energy Conversions

  • 1 joule = 0.239006 calories
  • 1 calorie = 4.184 joules
  • 1 kWh = 3,600,000 joules
  • 1 eV = 1.60218e-19 joules
  • 1 BTU = 1055.06 joules

How to Use the Energy Converter

  1. Choose your source and target energy units from the dropdown menus.
  2. Enter the energy value you want to convert in the input field.
  3. See your converted energy value instantly displayed on screen.

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Frequently Asked Questions

How do I perform a quick energy conversion?

Simply enter your value in the input field, select your source and target units from the dropdowns, and our converter will instantly show you the converted value.

Are the energy conversions accurate?

Yes, our converter uses precise mathematical formulas for each conversion to ensure you get accurate results every time. Our calculations are based on internationally recognized standards.

Can I use this energy converter offline?

Our converter is a web-based tool, but you can save our page for offline use in most browsers. For regular offline usage, we recommend installing our progressive web app by clicking "Add to Home Screen" in your browser menu.