Kilojoules calculator

At Kilojoules.co.za, we believe that anyone in South Africa can maintain or reach their goal weight, as long as they have the right information and the will to succeed.

By understanding how kilojoules work, how many kilojoules to consume per day to lose weight, and checking food and drinks kilojoule and calorie counter charts you can start to choose low kilojoule food to help you to achieve your fat loss goals. Combine that with a bit of enjoyable exercise to burn kilojoules, and you’ll be well on your way to a fitter and healthier you.




Most people can tell whether or not they need to lose weight simply by looking in the mirror or judging how they feel in their clothes. If your favourite jeans no longer fit or there’s an extra chin peeking over the top of your polar neck, then you probably know it’s time to put down the donuts and pick up a dumbbell.

If you’ve decided that you need to lose weight – or in some cases, gain weight – you need to know how much to lose or gain. It’s important to have a specific weight goal for a number of reasons: First of all, it gives you a target to aim for, and it’s much easier to strive towards something if you know what the end result should be.

Second of all, it’s important that you know what your ideal weight is so that you can maintain it without going to extremes. It’s not only over-eating that can be bad for your health – too much exercising, or dieting to extremes, can also be very detrimental to your wellbeing. Lastly, maintaining your ideal weight is one of the cornerstones of good health and wellness.

Kilojoule and calorie calculators

Learn all about kilojoules, or use our kilojoules calculators to find out whether you’re eating the right foods for weight loss.

How many kilojoules to burn daily to reach your ideal weight

If you need to lose weight, the best way to do it is by switching to a low kilojoule diet and increasing the amount of fat burning exercise you do.

For every extra kilogram of fat on your body, you have consumed roughly 37 000 more kilojoules than you need. Thus, to lose one kilogram, you need to burn an additional 37 000kJ, over and above what you need for your regular daily activities.

Use this calculator to convert calories to kilojoules or kilojoules to calories:

Use this calorie calculator to calculate calories burned per day based on height, weight, age, gender and your activeness:

So how do you find out what your ideal weight is? That’s easy – you can do it right here using our BMI calculator.

BMI calculator: Work out your ideal weight

Body Mass Index (BMI) works on the assumption that humans are all similarly shaped, and that the taller a person, the more he or she should weigh. Of course, we know that humans come in all shapes and sizes, and that nutritional needs differ based on a range of factors, including age, gender, current weight and so forth.

However, BMI has become a universally recognised means of establishing whether an individual is at the correct weight for their height. Moreover, it provides a fairly generous range of acceptable weights for each height, thus allowing for curvier or slenderer figures to be considered within the normal range. BMI calculators also work out how much weight an individual should lose or gain in order to reach an acceptable weight.

A BMI of 20–25 is considered normal, while a BMI under 20 is considered underweight, and a BMI over 25 is considered overweight.

Input your height (cms) and weight (kgs) into the BMI calculator below to work out your BMI:

Now that you know your BMI, you’ll also know what your ideal weight is, and how many kilograms you need to lose or gain to reach it.

Visit our exercise and dieting page to find out how many kilojoules you can burn by doing different types of exercises, or read our about kilojoules in food to learn more about low kilojoule foods and low kilojoule diets.