Energy Converter

Convert Joules, Calories, kWh, and BTU.

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Compare with other units

Calories (cal)0.239006
Kilocalories (kcal)0.000239006
Watt-hours (Wh)0.000277778
Kilowatt-hours (kWh)2.7778e-7
BTU0.000947813
Foot-pounds0.737561

Energy Converter: Joules, Calories, kWh

Convert energy units for physics, nutrition, and electricity. Joules to Calories, Kilowatt-hours to BTU, and more.

Energy Measurement

Energy can be measured in mechanical work (Joules), heat (Calories), or electrical usage (Kilowatt-hours).

Common Conversions

  • 1 Calorie (cal) ≈ 4.184 Joules
  • 1 Kilocalorie (Food Calorie) = 1,000 Calories
  • 1 Kilowatt-hour (kWh) = 3.6 Million Joules
  • 1 BTU ≈ 1,055 Joules

Frequently Asked Questions