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Energy Converter

Convert between joules, calories, kWh, and BTU.

Free · No sign-up · Works in your browser

Joule (J)
1
Kilojoule (kJ)
0.001
Calorie (cal)
0.239006
Kilocalorie (kcal)
0.000239
Watt-hour (Wh)
0.000278
Kilowatt-hour (kWh)
0
BTU
0.000948
Foot-pound (ft·lb)
0.737561

About the Energy Converter

Free energy converter — convert between joules, kilojoules, calories, kilocalories, watt-hours, kWh, BTU, and foot-pounds.

How to use the Energy Converter

  1. 1Enter a value.
  2. 2Pick the unit to convert from.
  3. 3Read every other unit and copy.

Frequently asked questions

How many joules in a calorie?

1 calorie = 4.184 joules; 1 kcal (food calorie) = 4,184 joules.

What is a kWh in joules?

1 kWh = 3,600,000 joules (3.6 MJ).

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