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Energy Converter - Joules, Calories, kWh, BTU

Convert energy — joules, calories, kcal, kJ, watt-hours, kWh, BTU. Exact factors shown (1 cal = 4.184 J), with the food calorie vs kcal explained. Works offline.

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Converted valueChoose units and convert.

How to use this tool

  1. Enter or select your input.
  2. Run the tool and review the result.
  3. Copy or download the output when available.

About this tool

Convert energy — joules, calories, kcal, kJ, watt-hours, kWh, BTU. Exact factors shown (1 cal = 4.184 J), with the food calorie vs kcal explained. Works offline.

Frequently asked questions

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