Skip to content

Energy Converter

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

About this calculator

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

How to use

  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

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