Energy Converter

Convert between joules, calories, kWh, BTU, and more.

Calculators

How to Use Energy Converter

  1. 1Enter an energy value
  2. 2Select the source unit
  3. 3See all other unit equivalents instantly

About Energy Converter

The Energy Converter converts between all common energy units: joules (J), kilojoules (kJ), calories (cal), kilocalories (kcal), watt-hours (Wh), kilowatt-hours (kWh), megawatt-hours (MWh), BTU, foot-pounds (ftยทlb), and electron-volts (eV).

Frequently Asked Questions

What is the difference between cal and kcal?

1 kcal (food calorie) = 1000 cal. Food nutrition labels use kcal, often labelled as "Calories" with a capital C.