A British Thermal Unit (BTU) is the amount of heat needed to raise the temperature of one pound of water by one degree Fahrenheit. 1 BTU equals approximately 1,055 joules.

What is a kilowatt-hour?

A kilowatt-hour (kWh) is a unit of energy equal to using 1,000 watts for one hour. It is the standard billing unit for household electricity.

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Energy Converter

Convert between 7 different energy units instantly. Free, accurate, and easy to use.

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Available Energy Units

Joule

Kilojoule

Calorie

cal

Kilocalorie

kcal

Watt-hour

Kilowatt-hour

kwh

BTU

btu

Popular Energy Conversions

Joule → Kilowatt-hour

j to kwh

Joule → BTU

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Frequently Asked Questions

How do I convert calories to kilojoules?

To convert kilocalories (food calories) to kilojoules, multiply by 4.184. For example, 100 kcal = 418.4 kJ.

What is a BTU?

A British Thermal Unit (BTU) is the amount of heat needed to raise the temperature of one pound of water by one degree Fahrenheit. 1 BTU equals approximately 1,055 joules.