Skip to main content
Weight management
Summary
Read the full fact sheet- A kilojoule (or Calorie) is a unit of energy. In Australia, we use kilojoules (kJ) to measure how much energy people get from consuming a food or drink.
- The kilojoule content of foods depends on the amount of carbohydrates, fats and proteins present in the food, and the portion size.
- Foods that are high in fats, added sugars or alcohol are by far the highest in kilojoules.
- Foods such as fruits, vegetables and legumes are lower in kilojoules.
- You can find out how many kilojoules are in packaged foods by checking the label.
- When eating out or grabbing food on the run, check for kilojoules on the menu or food display tags
On this page
- Energy as kilojoules
- Kilojoules in food
- Our energy requirements vary
- Where to get help
Energy as kilojoules
In Australia, we use kilojoules (kJ) to measure how much energy people get from consuming a food or drink. A kilojoule is a unit of measure of energy, in the same way that kilometres measure distance.
Food energy used to be measured in Calories (Cal) and some countries still use those units.
The conversions are as follows:
- 1 joule = 0.24 calories
- 1 calorie = 4.184 joule
Kilojoules in food
The food and drinks we eat provide energy, which is measured in kilojoules. How much energy they provide depends on the amount of carbohydrate (sugars/starch), protein, fat and alcohol the food or drink contains, as well as the portion size.
Different ingredients in food and how they are prepared mean some have more kilojoules than others. Larger serving sizes also mean more kilojoules.
We know drinks contain energy (kilojoules), but because liquid is not as filling as food, we often don’t realise how many kilojoules we are consuming from drinks. Some drinks are surprisingly high in kilojoules.
It can be hard to tell how many kilojoules are in each food just by looking, but in general:
- Fats and alcohol are high in kilojoules.
- Protein and carbohydrates provide moderate amounts of kilojoules.
- Dietary fibre is low in kilojoules.
- Water provides no kilojoules (energy).
- Foods such as fruits, vegetables and legumes are less energy-dense foods (lower in kilojoules).
- Foods that are high in fats, added sugars or alcohol are by far the most energy-dense foods (highest in kilojoules).
You can find out how many kilojoules are in specific foods by checking the label (nutrition information panel) on packaged foods in the supermarket. When eating out or grabbing food on the run, check for kilojoules on the menu or food display tags.
Our energy requirements vary
Your energy (kJ) needs each day and how much energy you burn vary and depend on:
- how active you are in your daily activities
- the amount and type of exercise you do
- your height and weight
- your sex – men generally have higher energy requirements than women, because they have more muscle tissue
- your body composition – muscle tissue has a big appetite for kilojoules. The more muscle mass you have, the more kilojoules you will burn
- if you are pregnant or breastfeeding
- genetics and your health status
- your age – young children and teens need high amounts of energy to fuel growth. As we age, activity levels are often reduced, which causes a loss of muscle tissue, and so our energy requirements tend to decrease.
Where to get help
- Balancing energy in and out, Nutrition Australia.
This page has been produced in consultation with and approved by:
This page has been produced in consultation with and approved by:
View all weight management
More information
Related information
- Aerobics - preventing injury Aerobics injuries are usually caused by trauma and overuse, but can be prevented by using the right techniques and equipment.
- Alcohol facts Learn all about alcohol - includes standard drink size, health risks and effects, how to keep track of your drinking, binge drinking, how long it takes to leave the body, tips to lower intake.
- Anorexia nervosa A common misconception is that anorexia nervosa only affects young women, but it affects all genders of all ages.
- Antioxidants Antioxidants scavenge free radicals from the body's cells, and prevent or reduce the damage caused by oxidation.
- Kilojoules on the menu (Chinese Simplified) Kilojoule labelling is now on the menu of large food chain businesses – both in-store and online.
From other websites
Content disclaimer
Content on this website is provided for information purposes only. Information about a therapy, service, product or treatment does not in any way endorse or support such therapy, service, product or treatment and is not intended to replace advice from your doctor or other registered health professional. The information and materials contained on this website are not intended to constitute a comprehensive guide concerning all aspects of the therapy, product or treatment described on the website. All users are urged to always seek advice from a registered health care professional for diagnosis and answers to their medical questions and to ascertain whether the particular therapy, service, product or treatment described on the website is suitable in their circ*mstances. The State of Victoria and the Department of Healthshall not bear any liability for reliance by any user on the materials contained on this website.
Reviewed on: 23-04-2018
