Joules to Kilocalories Converter

To convert a measurement in joules to kilocalories, multiply the value by 0.000239005736. The conversion factor comes from the relationship between both units and the joule.

For example, to convert 5 J to kilocalories: 5 × 0.000239005736 = 0.001195028681 kcal.

A joule is the SI derived unit of energy, equal to the work done when a force of one newton moves an object one meter (1 N·m). Named after the English physicist James Prescott Joule, who established the mechanical equivalent of heat in the 1840s. The joule became the SI standard for all forms of energy, work, and heat.

Common uses of joules include: Scientific and engineering energy calculations; Nutrition labeling in metric countries; Mechanical work and kinetic energy; Electrical energy in physics (watt-seconds).

A kilocalorie equals 1,000 small calories, or exactly 4,184 joules, and is the 'Calorie' shown on food nutrition labels. The food Calorie (capital C) is actually a kilocalorie. This convention, established in nutrition science, means a 500-Calorie meal contains 500 kilocalories, or about 2,092 kilojoules.

Common uses of kilocalories include: Food energy (the dietary 'Calorie'); Metabolism and exercise burn estimates; Nutrition and diet planning; Bomb-calorimetry food testing.

Here are some common values converted:

1 J = 0.000239005736 kcal 5 J = 0.001195028681 kcal 10 J = 0.002390057361 kcal 50 J = 0.011950286807 kcal 100 J = 0.023900573614 kcal