Macros, short for macronutrients, are the proteins, carbohydrates and fats your body needs every day. You can calculate your macros by working out your daily calorie needs and dividing those calories into the right balance of protein, carbohydrates and fats based on your goals.
Whether your goal is fat loss, muscle gain or simply eating a healthier diet, understanding macros can make nutrition much easier. This guide explains what macros are, why they matter, how to calculate them and how to adjust them to suit your lifestyle.
What are macros?
Macros, or macronutrients, are the nutrients your body requires in large amounts to function properly. Unlike vitamins and minerals, which are needed in smaller quantities, macros provide your body with energy and help support almost every bodily function.
There are three main macronutrients: protein, carbohydrates and fats. Each one plays a unique role in keeping you healthy and performing at your best.
Instead of thinking of foods as simply "good" or "bad", understanding macros helps you see what nutrients you're actually eating. This makes it much easier to build a balanced diet that supports your goals.
The three macronutrients explained
Protein
Protein is essential for building and repairing muscle, producing hormones, supporting your immune system and helping you recover after exercise.
Protein is also the most filling macronutrient, making it particularly useful if you're trying to lose weight while maintaining muscle mass.
Good sources of protein include chicken, turkey, lean beef, fish, eggs, Greek yoghurt, cottage cheese, tofu, beans and protein powders.
Each gram of protein contains 4 calories.
Carbohydrates
Carbohydrates are your body's preferred source of energy. They fuel your workouts, support brain function and help replenish energy stores after exercise.
Despite the myths surrounding carbs, they are not inherently unhealthy. The type and quantity of carbohydrates you eat matter far more than avoiding them altogether.
Good carbohydrate sources include oats, rice, potatoes, pasta, fruit, vegetables, wholegrain bread and legumes.
Each gram of carbohydrate contains 4 calories.
Fats
Dietary fat is essential for hormone production, brain health, nutrient absorption and protecting your organs.
Healthy fats should form an important part of your diet, even if your goal is weight loss.
Good fat sources include avocados, nuts, seeds, olive oil, salmon and nut butters.
Each gram of fat contains 9 calories.
Why are macros important?
Many people focus only on calories when trying to improve their diet. While calories determine whether you gain, lose or maintain weight, the balance of your macros affects how your body performs and how you feel.
Eating enough protein helps preserve muscle during a calorie deficit. Consuming adequate carbohydrates gives you energy for training and daily life. Healthy fats support hormone production and overall wellbeing.
When your macros are balanced correctly, you'll often find it easier to stay full, recover from exercise and maintain consistent energy levels throughout the day.
What are macros and how do I calculate them?
Calculating your macros isn't as complicated as it sounds. It simply involves working out how many calories you need each day and then splitting those calories between protein, carbohydrates and fats.
Here's a straightforward way to do it.
Step 1: Calculate your daily calorie needs
The first step is to estimate how many calories you need each day.
Your calorie target depends on factors including your age, sex, height, weight, activity level and overall goal.
If you're aiming to lose weight, you'll generally eat fewer calories than you burn.
If you're looking to build muscle, you'll usually eat slightly more calories than you burn.
If your goal is maintenance, you'll aim to eat around the same number of calories you use each day.
Step 2: Set your protein intake
Protein is usually the easiest macro to calculate first.
A common recommendation is to consume around 1.6 to 2.2 grams of protein per kilogram of body weight if you exercise regularly.
For example, someone weighing 70kg may aim for approximately 112 to 154 grams of protein each day.
Step 3: Set your fat intake
Healthy fats are essential and shouldn't be avoided.
Many people do well with around 0.8 to 1 gram of fat per kilogram of body weight, although this can vary depending on personal preference and overall calorie intake.
Step 4: Fill the remaining calories with carbohydrates
Once protein and fats have been calculated, the rest of your daily calories can come from carbohydrates.
This allows you to fuel your workouts while staying within your overall calorie target.
Example macro calculation
Let's imagine someone who weighs 70kg and wants to maintain their weight on 2,200 calories per day.
They decide to eat 140g of protein. Since protein contains 4 calories per gram, this provides 560 calories.
They also choose 70g of fat. At 9 calories per gram, this equals 630 calories.
Together, protein and fat provide 1,190 calories.
The remaining 1,010 calories can come from carbohydrates. Since carbohydrates contain 4 calories per gram, this works out at approximately 252g of carbohydrates per day.
Their daily macros would therefore be:
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Protein: 140g
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Carbohydrates: 252g
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Fat: 70g
This is just one example. Your ideal macros will depend on your own body, activity level and goals.
Do you need to track your macros?
Not everyone needs to track every gram they eat.
Some people enjoy the structure that macro tracking provides because it gives them a clearer understanding of portion sizes and nutrient intake.
Others prefer using macro tracking for a few weeks to learn about food before switching to a more intuitive way of eating.
The best approach is the one you can maintain consistently over time.
Which goals benefit from tracking macros?
Macro tracking can be useful for many different health and fitness goals.
If your aim is fat loss, tracking helps ensure you're eating enough protein while maintaining a calorie deficit.
If you're trying to build muscle, macros help make sure you're eating sufficient protein and enough overall calories to support growth.
For athletes, tracking macros can improve recovery, training performance and consistency.
Even people with no specific fitness goal often find that understanding macros helps them make better food choices.
Common mistakes when calculating macros
One of the biggest mistakes is assuming everyone should eat the same macro split.
Your requirements are individual and depend on factors including your size, activity level, age and personal preferences.
Another common mistake is focusing only on hitting macro targets while ignoring food quality.
It's possible to reach your protein, carbohydrate and fat goals while eating mostly highly processed foods, but this won't provide the vitamins, minerals and fibre your body also needs.
Many people also forget that consistency matters far more than perfection.
Missing your macros slightly on one day won't ruin your progress. What matters is your average habits over weeks and months.
Can your macros change over time?
Absolutely.
As your body weight changes, your activity level increases or your goals evolve, your macro requirements may also need adjusting.
For example, someone training for a marathon will often require more carbohydrates than someone doing two gym sessions per week.
Likewise, someone entering a fat loss phase may reduce their calorie intake while maintaining high protein levels to help preserve muscle.
Reviewing your progress every few weeks can help ensure your macros continue to support your goals.
Should you count calories as well as macros?
Since macros make up your calorie intake, many people naturally track both together.
Calories determine whether you lose, gain or maintain weight, while macros influence how those calories are distributed between protein, carbohydrates and fats.
Focusing on both provides a more complete picture of your nutrition than looking at calories alone.
Are macros more important than food quality?
No.
Macros are an excellent framework for building your diet, but they don't tell the whole story.
A balanced diet should also include plenty of fruit, vegetables, wholegrains, healthy fats and minimally processed foods to provide essential vitamins, minerals and fibre.
The most successful nutrition plans combine sensible macro targets with a varied, enjoyable diet that you can stick to long term.
Frequently asked questions
Are macros only for bodybuilders?
Not at all.
Anyone can benefit from understanding macros, whether your goal is improving health, losing weight, gaining muscle or simply learning more about nutrition.
How accurate do I need to be?
You don't need to be perfect.
Being reasonably consistent is usually enough to see excellent progress over time.
Can I still eat treats?
Yes.
A healthy diet doesn't require perfection. Enjoying your favourite foods in moderation can make your nutrition much easier to maintain.
Which macro is the most important?
All three are important because they each perform different functions.
However, if you're physically active, eating enough protein is often one of the biggest priorities for supporting recovery and maintaining muscle.
Final thoughts
If you've ever wondered, what are macros and how do I calculate them?, the answer is simpler than many people expect.
Macros are simply protein, carbohydrates and fats, and calculating them starts with understanding your calorie needs before dividing those calories into the right balance for your goals.
You don't need to obsess over every gram you eat, but learning the basics of macros can give you far more control over your nutrition. Whether you're trying to lose weight, build muscle or improve your overall health, understanding macros is a practical skill that can help you make informed food choices and achieve sustainable results.