Energy Converter
About Energy Converter
What Is an Energy Converter?
An energy converter transforms energy and work measurements between different units. Energy is one of the most fundamental concepts in physics and is measured in many units depending on the context. The SI unit is the joule, but nutritional energy uses calories, electrical energy uses kilowatt-hours, heating uses BTU, and particle physics uses electron volts.
Common Energy Conversions
Key factors: 1 calorie = 4.184 joules, 1 kilocalorie (food Calorie) = 4,184 joules, 1 BTU = 1,055.06 joules, 1 kWh = 3,600,000 joules, 1 eV = 1.602 x 10^-19 joules. One kWh is the energy consumed by a 1,000-watt appliance running for one hour.
How to Use This Converter
Enter an energy value, select source and target units, and click Convert. A table of all units is displayed for comprehensive reference.
Frequently Asked Questions
What is the difference between a calorie and a Calorie?
A lowercase calorie (cal) is 4.184 joules. An uppercase Calorie (Cal or kcal) is 1,000 small calories = 4,184 joules. Food labels use kilocalories (Calories).
What is a BTU?
BTU (British Thermal Unit) is the energy needed to raise one pound of water by one degree Fahrenheit. Used for heating, cooling, and HVAC system ratings.
How do I convert kWh to joules?
Multiply by 3,600,000. One kWh = 3.6 million joules. This is because 1 kW = 1000 W = 1000 J/s, and 1 hour = 3,600 seconds.
