Energy Converter: Convert Joules, Calories & More Online
The Energy Converter changes values between energy units, including joules, kilojoules, megajoules, calories, kilocalories, watt-hours, kWh, and BTU. Choose a source unit and a target unit to read the converted figure. Reference values include 1 thermochemical calorie = 4.184 J, 1 kWh = 3.6 MJ, and 1 IT British thermal unit = 1055.05585262 J; food Calories are kilocalories.
The Energy Converter is an energy unit converter for changing a value from one energy unit to another. Use it to convert energy units online, such as joules, calories, kWh, or BTU, and read the result in the unit you need. It is useful when a measurement and its intended audience use different units.
To convert a value, enter the energy amount and choose the source and target units. The converter presents the result in the target unit. Useful reference relationships include 1 thermochemical calorie = 4.184 J, 1 kilowatt-hour = 3.6 MJ, and 1 IT British thermal unit = 1055.05585262 J. Food calories are kilocalories, so 1 kcal = 4184 J.
Energy units represent the same kind of quantity at very different scales. A joule, a kilowatt-hour, and a BTU use different unit conventions, while an electronvolt is very small and a ton of TNT represents a much larger amount of energy. Converting between units makes measurements easier to compare, communicate, and use in calculations. The tool covers joules, kilojoules, megajoules, calories, kilocalories, watt-hours, kWh, and BTU.
The Energy Converter runs entirely in your browser. Your input is processed on your device and is not uploaded, stored, or sent to a server. Once the page has loaded, it works offline without a server dependency.
Developers, DevOps engineers, students, and anyone working with energy measurements can use the converter to check values in a familiar unit. It is also helpful when preparing documentation or sharing measurements with people who use a different unit.
Step 1: Enter the energy value you want to convert. Start with the figure in your source unit.
Step 2: Choose the source unit. Available units include joules, kilojoules, megajoules, calories, kilocalories, watt-hours, kWh, and BTU.
Step 3: Choose the target unit. Select the unit your calculation, report, or audience requires.
Step 4: Read the converted figure. Use the result in the target unit instead of estimating the conversion by hand.
Use case: Convert energy measurements when a source and target use different units. This helps you compare figures without manually calculating a conversion.
Use case: Check a figure in the unit your audience actually uses. For example, convert an energy value to the unit used in a report or explanation.
Use case: Convert a set of values when you need consistent results. This can save you from rounding each conversion by hand.
Use case: Compare a kilowatt-hour figure with megajoules. The exact relationship is 1 kWh = 3.6 MJ.
Use case: Clarify food energy values by checking kilocalories against calories. Food Calories are kilocalories, and 1 kcal = 4184 J.
Use case: Review energy figures for technical or educational material. Reference values such as the thermochemical calorie and IT British thermal unit help explain the units being compared.