Catherine Saxelby

Nutritionist, Blogger, Award Winning Author
  • 18 September 2023

    Product snapshot: Tomato pasta sauces

    What’s in your favourite tomato pasta sauce, and how much of it? Here are the most popular sauces reviewed for your reading ple...
  • 14 June 2023

    Protein-rich foods – serve sizes

    Protein, protein, protein. Are you getting enough? Here is a handy list of MEAT and NON-MEAT SOURCES of protein for you to prin...
  • 07 June 2023

    The truth behind coconut oil

    Many “health gurus” tout the benefits of coconut oil. Just type the term into any search engine and you’ll be flooded with arti...
  • 31 May 2023

    Gardening – is it really exercise?

    Did you know that gardening can reduce your risk of heart diseaset?  This month I’ll share this and the latest posts from ...
  • 17 May 2023

    Plant-based meat substitutes

    What do YOU think about plant-based meat substitutes? Veggie-loaded burgers? All-vegetable rissoles? Meatless Mondays?Yet anoth...
  • 10 May 2023

    The truth about lecithin

    What IS lecithin, I hear you ask. A popular “health food” supplement, lecithin is a type of fat called a phospholipid, which ha...
  • 03 May 2023

    Intermittent fasting vs daily calorie restriction

    As you probably know already, intermittent fasting (IF) has gained favour as an alternative regimen to daily caloric restrictio...
  • 26 April 2023

    Reduce your risk of a knee replacement - if you lose weight

    Did you know that you can reduce your risk of needing a knee replacement by losing weight?  I’ll share this and the latest...
  • 19 April 2023

    Brighten your diet – eat by the rainbow

    What’s the first thing that strikes you when you walk into a fresh produce store? If you’re imagining the rainbow of colour…so ...
  • 29 March 2023

    Eat a high quality diet and there's less chance of overweight..

    Did you know that a better (high quality) diet can help you reduce overweight? I’ll share this and the latest posts from the Fo...

How to convert kilojoules to Calories

Written by Catherine Saxelby on Wednesday, 30 September 2009.
Tagged: Calories, dieting, diets, energy, fat loss, food labels, FSANZ, guides, kilojoules, nutrients, nutrition, technology

How to convert kilojoules to Calories
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Just like yards became metres and pounds became grams, so Calories have become kilojoules. Kilojoules are the metric equivalent of Calories and have replaced Calories in Australia and many other metric countries. Yet they're very confusing, especially to my US visitors who have always only known Calories (lucky for me, I grew up with Calories then had to learn kilojoules!)

These are the units used to measure food energy - kilojoules (abbreviated to kJ) and Calories (Cals). Like other food scientists, I use the capital C as shorthand for the longer correct term of kilocalories

Kilojoules LOOK four times larger than Calories simply because there are more digits eg a bowl of cereal supplies around 480 kilojoules or 117 Calories.

Conversion is 4.2 ... or just 4

  • 1 Calorie equals 4.186 kilojoules (4.2 or simply 4 is close enough for a quick conversion).
  • For example, a slice of bread supplies 290 kilojoules or (290 divided by 4) 70 Calories.

Kilojoules are difficult to grasp if you don't have a feel for the numbers. So here's a handy guide to make things more ‘friendly'.

 

How diets compare in kilojoules and Calories              

kilojoules   kJ                                    
Calories  Cals                            
Intake or level                                         
10000 2400 Typical level of intake of most teenagers
  8700 2070 Average intake used to calculate %DI on food labels
  7500 1800 Typical weight loss level for a moderately-active man
  7000 1650 Typical weight loss level for a sedentary man
  6000 1500 Typical weight loss level for a moderately-active woman
  5000 1200 Typical weight loss level for a sedentary woman
  4000 1000

Supervised fast or meal replacement intake
- too low for normal living and activity

 

Here's how food compares in kilojoules and Calories:

 
Food Amount                   
grams                
kJ                      
Cals             
Bread 1 slice 30 g 290 70
Egg 1 large 60 g 335 80
Canned salmon, drained 1 can 150 g 525 125
Tim Tam chocolate biscuits 2 38 g 840 200
Krispy Kreme doughnuts, original glazed 2 104 g 1680 400
Orange juice 1 glass 250ml 400 95

 

orange-juice-smll1 glass orange juice = 400 kJ or 95 Calories

Tip

Round the kilojoules to the nearest 0 or 5. So 288 kJ rounds up to 290 kJ, while 292 rounds down to 290 kJ. Five kilojoules translates to 1 Calorie which is hardly anything and makes your useage of kilojoules easier - as there's fewer digits to remember. We round off all the kilojoule counts on our recipes for ease of use.

Rule of thumb

To obtain Calories, divide kilojoules by 4 for a quick conversion.

Catherine Saxelby About the author

About the Author

 

01 944649032

 

Catherine Saxelby's My Nutritionary

Winner of the Non-Fiction Authors Gold award

 

Catherine Saxelby has the answers! She is an accredited nutritionist, blogger and award-winning author. Her award-winning book My Nutritionary will help you cut through the jargon. Do you know your MCTs from your LCTs? How about sterols from stanols? What’s the difference between glucose and dextrose? Or probiotics and prebiotics? What additive is number 330? How safe is acesulfame K? If you find yourself confused by food labels, grab your copy of Catherine Saxelby’s comprehensive guide My Nutritionary NOW! 

Reviews

  • Product snapshot: Tomato pasta sauces

    Product snapshot: Tomato pasta sauces

    18 September 2023 by, Catherine Saxelby

    What’s in your favourite tomato pasta sauce, and how much of it? Here are the most popular sauces reviewed for your reading pleasure.

    I’ve rated nine of the most popular tomato pasta sauces in terms of their nutrition, ingredient lists and jar size. You’ll find many of these in your local supermarket. The sauces are ranked:

    • from Italian (Italy grows the reddest full-flavoured tomatoes) to Australian
    • per 100 grams, which is equivalent to 3½ ounces (the standard for comparing food products)
    • by serving size (varies between brands but is generally 100–175 g in size)
    • by ingredient list, jar size and where made (with each product’s website as the source)

    The bottom line

    When you’re next out shopping, run your eyes down the per 100 g column and look for products containing less than 400 mg sodium AND less than 5 g fat (which equals 5% fat). Most of the brands are below these levels. I like Barilla, Sacla, Leggo’s, La Gina and Mutti – but that’s just me!

    Read more
  • Product Review: Low-sugar alcoholic ginger beer

    Product review: Low-sugar alcoholic ginger beer

    1 March 2023 by, Catherine Saxelby

    Want something to drink before dinner? Something that’s LOWER in alcohol than wine? To match his beer? Then look no further than Bundaberg’s low-sugar alcoholic ginger beer.

    You can drink Bundaberg low-sugar ginger beer straight from the can, or pour it into a long glass over ice with a slice of lime.

     

  • Product snapshot: Khorasan Macaroni

    Product snapshot: Berkelo’s Khorasan Macaroni

    14 September 2022 by, Catherine Saxelby

    I’m loving this macaroni from Berkelo. I was sent a sample for Whole Grain Week 2022 by the Grains Legume Nutrition Council. I cooked it up and found that it was just divine! Read on for more …

  • Product Review: super-high-oleic-safflower-oil

    Product review: Super high-oleic safflower oil

    11 May 2022 by, Catherine Saxelby

    “What does super high-oleic mean?” I hear you ask.  Also, “I haven’t heard of safflower for ages. What’s the deal?” Read on and all will be explained.

  • Product Review: Healthy Life Food Tracker

    Product review: Healthy Life Food Tracker

    6 April 2022 by, Catherine Saxelby

    When I was first asked to write this review, I thought, Not another tracker.

    After all, there have been several in recent years, such as My Fitness Pal and Everyday Diet Diary. But this one is different. It works by using your Everyday Rewards card AND your shop at Woolworths.

  • Product review: Lite n' Easy

    Product review: Lite n' Easy

    20 October 2021 by, Catherine Saxelby

    With home delivery on the rise, this post is reviewing none other than that stalwart Lite n’ Easy. We all know their meals are good for weight loss (which we all need after COVID-19!), but did you know they’re also good for general health and wellbeing ? Eating well to nourish yourself – putting your mental health and wellbeing at the forefront – is gaining momentum. Lite n’ Easy meals also ensures you satisfy your need for vitamins, minerals, fibre and phyto-compounds, such as sterols and carotenoids.

    clipboardThis post has been sponsored by Lite n' Easy.  

     

  • Product review:  Birds Eye Plant Based range

    Product review: Birds Eye Plant Based range

    15 September 2021 by, Catherine Saxelby

    When you think of Birds Eye, their frozen peas and fish fingers probably come to mind. But I bet you’d never think of plant-based products!

    clipboardThis post has been sponsored by Birds Eye. 

Healthy Weight Loss

  • Intermittent fasting vs daily calorie restriction

    Intermittent fasting vs daily calorie restriction

    3 May 2023 by, Catherine Saxelby

    As you probably know already, intermittent fasting (IF) has gained favour as an alternative regimen to daily caloric restriction (DCR). Fasting is shown to extend the lifespan of rats, and has been associated with metabolic benefits in humans, yet the results so far have been inconsistent. So, which regimen is best for healthy weight loss?

    Read more
  • The lifestyle diet craze

    The lifestyle diet craze

    15 March 2023 by, Catherine Saxelby

    What sort of a diet should you follow to lose that excess weight? These days, it’s pretty confusing with high-protein Keto advocates clashing with plant-protein followers … as well as intermittent fasters, juice-only dieters, no-carb dieters and no-animal (aka plant-based) dieters. Plus all the ads for anti-hunger supplements, meal-replacement shakes and home-delivered meals, more of which somehow appear every day. So, what sort of diet should YOU follow to lose that excess?

  • Protein shakes for weight loss

    Protein shakes for weight loss

    9 November 2022 by, Catherine Saxelby

    These days, protein shakes aren’t bought by just body builders – they’re so popular that you can readily buy a 400 g tub at your local supermarket or service station. And with tempting claims such as ‘Facilitates muscle toning’, ‘Contains transformation-making protein’ and ‘Tastes incredible, mixes easily’, why wouldn’t you grab one? But protein shakes aren’t the magic answer to all your weight-loss woes. Let’s take a look at what you get for your money.

    Guest post by dietitian Zoe Wilson APD

  • What is your relationship with food and eating?

    How to beat those cravings

    20 January 2021 by, Catherine Saxelby

    Many of us have cravings from time to time and for different reasons. One thing is certain, they can sabotage all your best efforts at a healthy diet and/or weight loss. The good news? You CAN beat them. I’ll tell you how.

  • What is your relationship with food and eating?

    How to lose weight WITHOUT going on a diet

    14 October 2020 by, Catherine Saxelby

    The word 'diet' is a turn-off for most people. It sounds hard, unpleasant and unpalatable. Losing weight doesn’t have to be hard AND it doesn’t have mean sticking to a 'diet'. You can forget Paleo, Keto, Vegan and Raw, Gluten-free and Intermittent Fasting. To lose weight, you don’t have to follow any specific diet. What you need is simple, healthy, nutritious food and a few tips and tricks.

  • What IS a healthy balanced diet for weight loss?

    What IS a healthy balanced diet for weight loss?

    16 September 2020 by, Catherine Saxelby

    Healthy weight loss happens when you lose weight slowly and steadily (around 1 kg or 2 pounds weight loss a week). Your goal is to lose weight while still getting your essential nutrients but from smaller portions. You certainly don’t want to be tired with no energy! That’s why you need regular healthy meals and snacks on hand to ensure your vitamins, minerals, omega-3s and fibre needs can be easily met. There is a new range of healthy weight loss meals available and it’s one that I’d like to recommend. With these ready meals, you’ll say goodbye to meal planning, shopping, meal preparation and cooking.

    This post is sponsored by Chefgood 

  • Kitchen make-over for the New Year

    Kitchen make-over for the New Year

    8 January 2020 by, Catherine Saxelby

     “This year, I'm going to lose weight!”, or “This year I’m opting for a healthier lifestyle!” Is your 2020 New Year's resolution something like one of these? If so, how is it going to happen?