To calculate your macros in four steps: estimate your TDEE (daily calorie needs), adjust it for your goal (deficit, maintenance or surplus), set protein (1.6-2.4 g per kg), set fats (0.8-1 g per kg) and let the leftover calories become carbs. Each macro has a caloric weight: protein and carbs give 4 kcal per gram, fats give 9 kcal per gram. Do this and you have your daily grams of protein, fat and carbs, and tracking them is all it takes to manage recomposition, bulking or cutting.
What macros are and why to count them
Macronutrients — protein, fat and carbs — are the three nutrient categories that provide calories. Counting macros means setting how many grams of each you eat per day, not just total calories. Two diets with the same calories but different macros give different gym results: protein builds and protects muscle, carbs fuel performance, fats support hormones.
Counting macros helps anyone with a specific goal (grow, cut, recomp) who wants predictable results. You do not need to weigh food forever, but learning to for a few weeks teaches portions and permanently changes how you eat.
Step 1 — Estimate your TDEE
TDEE (Total Daily Energy Expenditure) is how much energy you burn in a full day: basal metabolism plus activity. The simplest way to estimate it is to multiply bodyweight by a factor based on activity level.
| Activity level | Description | kcal per kg (indicative) |
|---|---|---|
| Sedentary | Desk job, little movement | 26-28 |
| Lightly active | 1-3 workouts per week | 30-32 |
| Moderately active | 3-5 workouts per week | 33-35 |
| Very active | 6-7 workouts, physical job | 37-40 |
Example: an 80 kg athlete training 4 times a week (moderately active) has an estimated TDEE of about 80 × 34 = 2720 kcal per day. This is a starting estimate: you find the real value by watching how weight reacts over the next 2-3 weeks.
Step 2 — Adjust for your goal
Apply your goal to the TDEE:
- Cutting (lose fat): subtract 300-500 kcal. See the calorie deficit guide for detail.
- Maintenance: leave TDEE unchanged.
- Bulking (grow): add 200-400 kcal.
In our example, the athlete wants to cut: 2720 − 400 = 2320 kcal daily target.
Step 3 — Set protein
Protein is the first macro to set because it matters most for muscle. Target: 1.6-2.4 g per kg of bodyweight. Toward the low end when bulking with plenty of calories, toward the high end when cutting, where it protects lean mass.
In our example (cutting), we pick 2.2 g/kg: 80 × 2.2 = 176 g of protein. Protein is 4 kcal/g, so 176 × 4 = 704 kcal from protein.
Step 4 — Set fats
Fats are needed to produce hormones and absorb vitamins: never drop below 0.6 g/kg. Practical target: 0.8-1 g per kg.
In our example we pick 0.9 g/kg: 80 × 0.9 = 72 g of fat. Fat is 9 kcal/g, so 72 × 9 = 648 kcal from fat.
Step 5 — Carbs fill the rest
Carbs are the variable that closes the sum: take total calories, subtract protein and fat calories, and divide the rest by 4 (kcal per gram of carb).
In our example: 2320 − 704 − 648 = 968 leftover kcal. 968 ÷ 4 = 242 g of carbs.
Here is the 80 kg athlete cutting, with the full calculation:
| Macro | Grams | kcal per gram | Total kcal |
|---|---|---|---|
| Protein | 176 g | 4 | 704 |
| Fat | 72 g | 9 | 648 |
| Carbs | 242 g | 4 | 968 |
| Total | — | — | 2320 |
These are the daily targets. Bulking would give more carbs; maintenance sits in between. The structure never changes: protein and fat are set first, carbs absorb the difference.
How macros change by goal
The same 80 kg athlete will have different macros depending on the phase. Protein stays stable or rises slightly when cutting; what changes most are carbs, which follow total calories. Here is an indicative comparison for the same athlete:
| Goal | Calories | Protein | Fat | Carbs |
|---|---|---|---|---|
| Cutting | 2320 | 176 g | 72 g | 242 g |
| Maintenance | 2720 | 168 g | 80 g | 332 g |
| Bulking | 3020 | 168 g | 80 g | 407 g |
The pattern is clear: protein and fat stay in a narrow range, while carbs act as the main energy lever. That is because protein and fat have minimum functions to meet (muscle, hormones), whereas carbs are the flexible fuel you raise or lower by goal. Once you grasp this, adjusting the diet between phases becomes simple: decide the calories, keep protein and fat in their ranges, and carbs do the rest.
How to track macros
Setting the numbers is half the job; the other half is actually eating to those numbers. Practical tools:
- Tracking apps: with food databases and barcode scanners they compute meal macros automatically. Log everything for a few weeks to learn portions.
- Kitchen scale: weigh dry foods early on. "Eyeballing" almost always underestimates, especially fats and dressings.
- Repeat meals: build 4-5 "template" meals that hit your macros and rotate them. Fewer decisions, less error.
- Prioritize protein and calories: if you cannot hit everything to the gram, at least nail total calories and protein. They are the two levers that matter most.
A coach can set macros inside the platform and see weekly adherence alongside training in real time. That is the advantage of managing nutrition and workouts in one place, as described in Athleex features.
Adjusting macros over time
The initial calculation is an estimate, not absolute truth. TDEE relies on average formulas and everyone deviates a bit from the average: some burn more, some less. So the real work starts after setting the numbers, watching how the body reacts over the next 2-3 weeks.
Practical rule: weigh yourself 3-4 times a week, always under the same conditions (morning, fasted, after the bathroom), and look at the weekly average, not a single day. If you are cutting and weight does not drop after 2-3 weeks, remove 150-250 kcal, usually from carbs, keeping minimum protein and fat stable. If you are bulking and gaining nothing, add 150-250 kcal of carbs. Adjust in small steps and give it time: changing numbers every two days makes it impossible to see what works.
Bodyweight swings with water, salt, gut content and hormonal cycle, even by 1-2 kg from one day to the next. That noise hides the signal if you watch a single data point. That is why the average of several measurements is the only reliable way to decide if and how to touch macros.
Also watch signals beyond the scale. Gym performance, waist measurements, how clothes fit and progress photos tell a fuller story than weight alone, especially during recomposition, when you can lose fat and gain muscle while the scale barely moves. If the scale is flat but your lifts climb, your waist shrinks and photos improve, your macros are working — do not panic and slash calories. Reading these signals together keeps you from chasing the scale and making changes that undo real progress. Patience with the data is as important as the calculation itself.
Common mistakes in calculating macros
- Setting carbs first: the right order is protein, then fat, then carbs as the remainder. Reversing it leaves protein too low.
- Forgetting dressings: oil, sauces and butter are dense fats that "vanish" to the eye but weigh heavily on the total. A tablespoon of oil is about 120 kcal.
- Not recalculating when weight changes: if you lose or gain 5-8 kg, TDEE changes and macros need revising.
- Obsessing over timing: spreading macros through the day helps, but the daily total matters far more. Do not lose sleep over eating "in the right window".
- Confusing cooked and raw weight: 100 g of raw rice becomes about 300 g cooked. Weigh consistently and know which state the app value refers to.
- Copying another athlete's macros: weight, height, activity and goal change everything. An influencer's numbers are not yours.
IIFYM: what it is and where its limits are
IIFYM stands for "If It Fits Your Macros". The correct idea underneath is flexibility: no food is banned by itself, what counts is the daily total of protein, fat and carbs. You can have a treat if it fits the numbers, guilt-free.
The limit, though, is believing calories and macros are everything and food quality does not matter. It does. Micronutrients (vitamins and minerals), fiber, satiety and gut health depend on what you eat, not only how much. A diet made only of ultra-processed foods that "fit the macros" leaves you hungry, low on fiber and short on micronutrients, even if the numbers add up. Practical rule: build 80-90% of intake from whole, nutrient-dense foods and use IIFYM flexibility for the remaining 10-20%. That gives you the best of both worlds: numeric precision and quality on the plate.
Disclaimer: this article is for information only and does not replace professional advice. For a personalized meal plan with macros tailored to you, consult a qualified nutritionist or dietitian; if you have a medical condition, check with your doctor first.
Want macros tailored to your goal and tracked over time? Sign up free on Athleex and connect to a coach, or explore the experience for athletes.
FAQ
How do I calculate my macros quickly? In four steps: estimate TDEE by multiplying bodyweight by an activity factor (30-35 kcal/kg for an athlete training 3-5 times a week), adjust for your goal (subtract 300-500 kcal to cut, add 200-400 to grow), then set protein at 1.6-2.4 g/kg and fats at 0.8-1 g/kg. The calories left become carbs, divided by 4. Remember the energy values: protein and carbs 4 kcal/g, fat 9 kcal/g. TDEE is a starting estimate to refine by watching how weight reacts over the following weeks.
How much protein goes in my macros? Between 1.6 and 2.4 g per kg of bodyweight per day. Toward the low end when bulking with plenty of calories, toward the high end when cutting, where protein protects lean mass and boosts fullness. For an 80 kg athlete that is roughly 130-190 g per day. Split it across 3-5 meals of 30-45 g to support protein synthesis through the day instead of concentrating it all in one meal.
Do I have to weigh food forever? No. Weighing food and using a tracking app for a few weeks teaches you real portions and reveals what your usual meals actually cost. After that period most people can eyeball with good accuracy and maintain results without weighing everything daily. Strict tracking is a learning tool and a precision aid for important phases, not a lifelong obligation.
What is IIFYM and does it have limits? IIFYM means "If It Fits Your Macros": if a food fits your daily macros, you can eat it. The correct idea is flexibility — no food is banned outright. The limit is thinking food quality does not matter: micronutrients, fiber, satiety and gut health depend on what you eat, not only how much. The practical rule is to build 80-90% of intake from whole, nutrient-dense foods and use flexibility for the remaining 10-20%.
Do macros need to be exact to the gram? No, a margin of ±5-10 g on each macro is fine: the body does not notice the difference between 240 and 245 g of carbs. What matters most is consistently hitting total calories and protein, the two main levers for body composition and muscle. If you cannot fit everything perfectly, prioritize those two and leave fats and carbs more flexible. Weekly consistency beats obsessive single-day precision.
