Megajoule to Kilojoule Converter

A megajoule (MJ) is a unit of energy equal to one million joules (10⁶ J). It represents moderate to large amounts of energy, commonly used for measuring food energy content, fuel values, and mechanical work in engineering applications.

The megajoule gained prominence with the development of energy-conscious engineering and nutrition science. It became particularly useful for expressing food energy content as an alternative to calories, and for measuring energy in automotive and mechanical engineering applications.

Megajoules are used in nutrition labeling (as an alternative to calories), automotive engineering, mechanical systems, and fuel energy content. They're found on food packaging in many countries, vehicle fuel efficiency ratings, and engineering calculations for mechanical work and heat transfer.

A kilojoule (kJ) is a unit of energy equal to one thousand joules (10³ J). It's commonly used for measuring food energy content, small-scale mechanical work, and energy in chemical reactions.

The kilojoule became widely adopted in nutrition and food science as many countries moved away from calories to metric energy units. It was officially adopted for food labeling in many countries as part of metrication efforts, providing a more scientifically consistent energy measurement.

Kilojoules are extensively used in food and nutrition labeling, exercise and fitness calculations, chemical reaction energy measurements, and small-scale engineering applications. They're mandatory on food labels in many countries and are standard in sports science and metabolism studies.