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Energy Converter - Joules, Calories, kWh, BTU

Free energy converter between joules, calories, kilocalories, kilowatt-hours, BTU for nutrition, electricity, and physics.

Convert between energy units

Enter your values to see results

and click the "Calculate" button

Energy Unit Conversion

Convert between energy units used in nutrition (calories), electricity (kWh), heating (BTU), and physics (joules).

1 kcal = 4.184 kJ | 1 kWh = 3,600 kJ = 3,412 BTU

Food calories (Cal) = kilocalories (kcal)

What's the difference between cal and Cal?

Small 'cal' is a calorie (4.184 J). Big 'Cal' or 'kcal' is a kilocalorie (4,184 J), used for food energy.

How many BTU in a kWh?

1 kWh = 3,412 BTU.

Calorie Calculator

Calculate daily calorie needs

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