Energy Converter

Convert joules, kilojoules, kilowatt-hours, calories, and BTU values instantly in your browser.

Convert joules, kilojoules, kilowatt-hours, calories, and BTU in one focused tool

Compare common electrical, thermal, and food-energy units in one place without switching through a broader all-in-one converter.

Energy setup

Choose the energy value and units

Pick the source unit, target unit, and amount you want to convert.

Units

Choose the source unit and target unit.

Convert from Convert to

Energy value

Enter the amount in the selected source unit.

Value in kilowatt-hour

Converted result

Review the live conversion

See the converted value, equation, and related conversions here.

Live result

Add a value to generate the conversion equation.

The main converted value and supporting details update as soon as the input is valid.

Quick conversions from the same source value

Based on the source value you enter

After you enter a valid value, this area shows related conversions from the same source amount.

Enter the energy value you want to convert.
Choose the source unit and the target unit.
Review the main converted value and the quick related conversions below it.
Use Swap to reverse the unit direction instantly.
Use Example to load a sample value or Clear to reset the converter.

1 kilowatt-hour -> kilojoules for appliance and electricity references
500 calories -> kilojoules for nutrition and energy label comparisons
3,412 BTU -> kilowatt-hours for heating and cooling estimates

This converter focuses on common energy units that people often compare across electricity, heating, cooling, nutrition, engineering, and science-adjacent everyday tasks. You can switch between joules, kilojoules, megajoules, watt-hours, kilowatt-hours, calories, kilocalories, and BTU in one narrow workflow.

A focused energy converter is useful when you are checking appliance usage, comparing electricity values, reading HVAC references, reviewing heating output, converting food-energy labels, or moving between unit systems in technical notes. Because the calculation runs in the browser, you can compare the value instantly without sending it anywhere.

- kWh to kJ - kcal to kJ - BTU to kWh - Joules to calories

- 1 kWh = 3600 kJ - 1 Wh = 3600 J - 1 kcal = 4.184 kJ - 1 BTU = 1055 J

- 1 kWh = 3,600 kJ - 1 kcal = 4.184 kJ - 1 BTU = 1,055.06 J

Unit Converter is broader. It also handles length, weight, temperature, area, volume, speed, and pressure. Energy Converter is narrower and faster when your only job is converting energy values such as kilowatt-hours to kilojoules, calories to joules, or BTU to kilocalories.

Which energy units are included?

The current tool supports joules, kilojoules, megajoules, watt-hours, kilowatt-hours, calories, kilocalories, and BTU.

Does the conversion update instantly?

Yes. The result updates as soon as you change the value or switch either unit.

Can I still use the full Unit Converter?