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What Is kJ? How Do We Measure It?

kJ, kilojoules is a unit of energy widely used in nutrition. Kilojoules are the metric measurement of calories. When we eat and drink, we put energy into our bodies. Our bodies use up that energy through everyday movement.

Every cell in our body requires energy to function in its optimal capacity. We need to nourish our bodies right. If we don’t get enough nutrients that calories provide, there will be negative consequences.

kJ Means Kilojoule

kJ means kilojoules. It is one way to measure the amount of energy there is in a food or drink.

Food energy is used to meet the body's needs for protein synthesis, maintenance of body temperature, cardiac output, respiration, and muscle function. (source 🗗)

Measure kJ

There are two ways to measure the amount of energy there is in a food or drink by kilocalories, KCAL or kilojoules, kJ. (source 🗗)

You can convert kilocalories to kilojoules by multiplying the calories by 4.2, which makes 100 kcals = 420 kJ. (source 🗗)

Where Do The Energy Come From?

The energy we consume comes from carbohydrates, protein, fats, and alcohol. (source 🗗)

More than 95% of food's energy is digested and absorbed from the gastrointestinal tract to provide the body's energy needs. (source 🗗)

Let your family and friends know about kJ, Kilojoule

Sara Niemelä

co-founder Care Omnia, Head Content Creator

I’m a wife and a mother of three. I enjoy the outdoors, cooking, and spending time with my family. Nutrition is my passion. I have spent thousands upon thousands of hours reading, analyzing, categorizing and comparing research studies. Nutrition is the foundation you build a healthy and fulfilling life upon!