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Energy Converter

Convert energy between joules, calories, watt-hours, and BTU.

About the Energy Converter

Convert energy between joules, calories, watt-hours, kilowatt-hours, and BTU.

How to use the Energy Converter

  1. Enter the energy value.
  2. Select the unit you are converting from and to.
  3. Press Convert to see the result and a full equivalents table.

Tips for the Energy Converter

  • "kcal" is the food Calorie shown on nutrition labels — 1 kcal = 1,000 small calories.

Example: Energy Converter

Converting a 500 kcal meal to kilojoules

  • Value: 500 kcal
  • Convert to: Kilojoules

Result: 2,092 kJ

1 kcal = 4.184 kJ exactly, so 500 × 4.184 = 2,092 kJ.

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