How many Joules are in one kilowatt-hour?

One kilowatt-hour (kWh) is equivalent to exactly 3.6 million Joules (3.6 MJ).

What is the difference between a calorie and a kilocalorie?

A calorie (cal) is standard scientific heat energy. A kilocalorie (kcal or 'food Calorie' with a capital C) is 1,000 scientific calories. Most nutritional packaging refers to kilocalories as Calories.

What is a British Thermal Unit?

A British Thermal Unit (BTU) is the amount of heat energy required to raise the temperature of one pound of liquid water by 1 degree Fahrenheit. One BTU is approximately equal to 1,055 Joules.

Energy Converter

Convert units of energy instantly: joules, calories, kilowatt-hours, BTU, and kilocalories online.

Value to Convert From Unit

Converted Value

860.4206

To Unit

What is Energy? The Capacity to Perform Work

In scientific terms, energy represents the capacity for doing work or producing heat. It exists in many forms, including potential, kinetic, thermal, chemical, electrical, and nuclear. The law of conservation of energy states that energy can be transformed from one form to another, but can never be created or destroyed.

Our **energy converter** simplifies calculating equivalencies across nutritional metrics, engineering ratings, heat potentials, and electricity usage.

Standard Energy Units Supported

This converter handles multiple energy domains, including:

Joule (J) / Kilojoule (kJ) / Megajoule (MJ): Standard SI metrics. Used in physics and general thermodynamics.
Kilowatt-hour (kWh): The standard unit used by utility companies globally to measure household and commercial electricity consumption.
Calorie (cal) / Kilocalorie (kcal): Used heavily in food science and nutrition tracking to measure diet metrics.
British Thermal Unit (BTU): Mostly used in air conditioning, heating, and fuel resource capacities.
Electronvolt (eV): Used in particle physics and quantum mechanics.

To convert active work output rates, visit our Power Converter. For gas pressures, explore the Pressure Converter. To compute dimensions, see the Area Converter.

Perform physical scale conversions with GoQuickTool. Switch pressure metrics on the Pressure Converter or inspect electricity output rates on the Power Converter.