What are macros?
"Macros" is short for macronutrients: protein, carbohydrates and fat. They are the nutrients you eat in large amounts and that provide energy. Alcohol also provides energy but is not considered a nutrient you need. Tracking macros means paying attention to how much of each you eat, not just total calories.
Why bother? Two days with the same calories can feel very different. A day high in protein and fibre may leave you full and energised; a day of mostly refined carbs and fat may leave you hungry. Macros help explain the difference.
Calories per gram
| Macro | Calories per gram | Main roles | Common sources |
|---|---|---|---|
| Protein | 4 | Building and repairing tissue, enzymes | Meat, fish, eggs, dairy, legumes, tofu |
| Carbohydrate | 4 | Main fuel for brain and muscles | Grains, fruit, starchy veg, legumes |
| Fat | 9 | Energy, cell structure, vitamin absorption | Oils, nuts, seeds, avocado, dairy |
| Alcohol | 7 | Not a nutrient; provides energy only | Beer, wine, spirits |
Fat contains more than twice the calories per gram of protein or carbs, which is why small amounts of oil, butter or nuts add up quickly.
How to set macro targets
Start with protein
Protein is the macro to set first and on purpose, because it is linked to fullness and to maintaining muscle. Many people set protein first, based on body weight; our guide to protein needs explains how.
Use common ranges for the rest
US dietary guidance describes broad ranges for healthy adults: roughly 45 to 65% of calories from carbohydrates, 20 to 35% from fat, and 10 to 35% from protein. These ranges are wide on purpose, because many different balances can be healthy. Some people feel better with more carbs, others with more fat. Within those ranges, choose a split that suits your food preferences and activity.
Do not forget fibre
Fibre is a type of carbohydrate that is useful to track on its own. Most adults fall short of recommendations; the UK, for example, suggests around 30 grams a day for adults.
A worked example
Say your daily calorie target is 2,000 and you choose 25% protein, 45% carbs and 30% fat:
- Protein: 25% of 2,000 = 500 calories ÷ 4 = 125 g
- Carbs: 45% of 2,000 = 900 calories ÷ 4 = 225 g
- Fat: 30% of 2,000 = 600 calories ÷ 9 = about 67 g
Those numbers are a guide for the day, not a test to pass. Getting within roughly 10% of each target on most days is plenty for most goals.
How to track in practice
- Log as you go. Recording a meal straight after eating is more accurate than reconstructing your day at night.
- Use labels for packaged foods. Scanning a barcode or nutrition panel gives the manufacturer's figures. See how to read a nutrition label.
- Use photos for plates. Home-cooked and restaurant meals are faster to log with a photo and a short note about oils or sauces.
- Save repeat meals. Most people eat a handful of breakfasts and lunches on rotation. Logging them once and reusing them saves time.
- Remember the extras. Cooking oil, dressings, milk in coffee and drinks are the most commonly forgotten items.
Common beginner mistakes
- Chasing perfection. Precision to the gram is not necessary. Consistency matters more.
- Ignoring food quality. Macros do not capture vitamins, minerals or fibre. A diet built mostly on whole foods is still the foundation.
- Changing targets every few days. Give a set of targets two to four weeks before adjusting, so you can see a real trend.
- Weekday focus only. Weekends often look quite different. Tracking them too gives a truer average.
Is macro tracking right for you?
Tracking suits many people for a period, to learn about their eating habits, and some enjoy keeping it up longer term. It is not for everyone. If tracking makes you anxious, or you have a history of disordered eating, it may not be helpful; a doctor or registered dietitian can suggest other approaches.
Frequently asked questions
What macro ratio should I use?
US dietary guidance gives broad ranges of 45 to 65% of calories from carbohydrates, 20 to 35% from fat and 10 to 35% from protein. Many balances within those ranges can be healthy; choose one that suits your goals and preferences.
How many calories are in a gram of protein, carbs and fat?
Protein and carbohydrates provide about 4 calories per gram, fat about 9, and alcohol about 7.
Do I need to hit my macros exactly?
No. Getting within roughly 10% of each target on most days is plenty for most goals. Consistency over weeks matters more than precision on any single day.