kJ & Calorie Guides: Labels, Intake & Energy Tips

Apps & Devices

How To Change MyFitnessPal From kJ To Calories

MyFitnessPal showing kilojoules when you want Calories (or vice versa)? Here's how to switch the energy unit in the app and on the website, and what happens to your goals.

Apps & Devices

How To Change kJ To Calories In Health & Fitness Apps

How to switch the energy unit from kilojoules to Calories in the iPhone Health app, the Fitness app, Fitbit, Samsung Health, Garmin Connect and Lifesum, plus a quick way to convert any reading.

Apps & Devices

How To Change Apple Watch From kJ To Calories

Is your Apple Watch showing kilojoules instead of Calories (or the other way round)? Here's how to switch the energy unit on the watch or from your iPhone in under a minute.

Exercise & Energy

Active kJ To Calories Burned: Convert Watch & Gym Readings

Fitness watches, gym machines and bike computers often show energy burned in kilojoules. Here's how to convert active kJ to Calories burned, and what the number really means.

Nutrition Basics

Why Do Some Countries Use Kilojoules Instead Of Calories?

Australians count kilojoules, Americans count Calories and Europeans get both. Here's how that happened, and what it means when you shop, travel or use apps.

Weight Management

How To Track Kilojoules In Calorie Counting Apps

Most food-tracking apps count Calories by default. Here's how to track accurately when your food labels are in kilojoules, switching units, converting targets and logging labels.

Nutrition Basics

KJ Vs Calories Vs kcal: What’s The Difference?

Kilojoules, Calories, kcal and cal all measure energy, but they're not all the same size. Here's exactly how they relate, why food labels differ between countries, and how to switch between them.

Exercise & Energy

How Many Kilojoules Does Walking 10,000 Steps Burn?

10,000 steps is roughly 7-8 km. Here's how many kilojoules and Calories that burns at different body weights and speeds, and what it means for your daily energy.

Food & Drink

Kilojoules In Fast Food: Burgers, Pizza, Fries & More

How many kilojoules are in a burger, a slice of pizza, fries or a meal deal? Typical values, how quickly a combo adds up, and smarter ways to order.

Food & Drink

Kilojoules In Coffee: Every Café Order Compared By Milk

From a long black with almost no kilojoules to a large mocha with more than 900 kJ, how your coffee order, cup size and choice of milk change the energy in your cup.

Food & Drink

Kilojoules In Alcohol: Beer, Wine, Cider & Spirits Compared

How many kilojoules are in a beer, a glass of wine or a mixed drink? A clear comparison, the simple formula behind it, and practical ways to cut drink kilojoules.

Nutrition Basics

How To Read kJ On A Nutrition Label (Step By Step)

A practical walk-through of the energy line on nutrition labels, per serve vs per 100 g, % daily intake, dual kJ/kcal labels and US-style panels, with worked examples.

Weight Management

How Many Kilojoules Should I Eat To Lose Weight?

A realistic, evidence-based guide to setting a kilojoule target for weight loss, how to find your maintenance intake, how big a deficit to aim for, and why going too low backfires.

Nutrition Basics

Kilojoules Per Gram: Protein, Fat, Carbs, Fibre & Alcohol

Why fat has 37 kJ per gram but protein and carbohydrate only 17, how food energy factors work, where they come from, and how to use them to check any label.

Exercise & Energy

Cycling kJ Vs Calories: Why 1 kJ On The Bike ≈ 1 Calorie

Your power meter says 1,000 kJ. Did you really burn 1,000 Calories? Almost, and here's the neat bit of physiology that makes it work.

About Our Guides

Every article on this blog is written to answer a real question people have about food energy, clearly, accurately and without hype. We explain the maths behind kilojoules and Calories, show you how to read nutrition labels from different countries, and put everyday foods, drinks and activities into numbers you can actually use.

All conversions use the international standard of 1 kcal = 4.184 kJ. Food values are typical figures based on the USDA FoodData Central database and common label values, and we link to our free calculators so you can check any number yourself.

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