Energy and Work Units Conversion

Energy and work units conversion calculator for metric (SI), U.S. customary and imperial measurement systems.

In SI (International system of units) the derived energy and work unit is joule (J). In U.S. and imperial system, the common energy and work units are pound force foot, British thermal unit (Btu) and horsepower hour.


Energy and Work

What is Energy ? Energy is a measure of how long we can sustain the output of power, or how much work we can do. There are two kinds of energy: potential and kinetic.

Potential energy is the energy waiting to be converted into power. Gasoline in a fuel tank as an example.

Kinetic energy is the energy a body possesses because it is in motion. The more the object weighs, and the faster it is moving, the more kinetic energy it has. The formula for kinetic energy is:
Kinetic Energy = m * v2 / 2 , where "m" is the mass and "v" is the velocity.

What is Work ? Work is the application of a force over a distance. Work is equal to the product of the force and the distance through which it produces movement. Although both force and displacement are vector quantities, having both magnitude and direction, work is a scalar quantity, having only magnitude.

If the force acts in a direction other than that of the motion of the body, then only that component of the force in the direction of the motion produces work. If a force acts on a body constrained to remain stationary, no work is done by the force. Even if the body is in motion, the force must have a component in the direction of motion.

Energy Conversion Tables
Joule to Calorie

Joule to Kilojoule

Joule to Kilowatt Hour

Joule to Megawatt Hour

Joule to Watts Hour

Kilojoule to Calorie

Kilojoule to Joule

Kilojoule to Kilowatt Hour

Kilojoule to Megawatt Hour

Kilojoule to Watts Hour

Kilowatt Hour to Btu

Kilowatt Hour to Calorie

Kilowatt Hour to Joule

Kilowatt Hour to Kilojoule

Kilowatt Hour to Megawatt Hour

Kilowatt Hour to Watts Hour

Megawatt Hour to Kilowatt Hour

Megawatt Hour to Watts Hour