basic

Energy Converter

Joules, calories, kilowatt-hours, and BTU side by side.

Convert between common units of energy including joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, electronvolts, and BTU.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
Was this helpful?

How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

In depth

Convert between common units of energy including joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, electronvolts, and BTU.