Counting macros — tracking your daily protein, carbohydrate, and fat intake — is one of the most effective methods for losing fat while preserving muscle. This guide walks through exactly how to calculate your macros for fat loss, step by step, with worked examples.
What Are Macros?
Macros (macronutrients) are the three main categories of nutrients that provide calories:
- Protein — 4 calories per gram. Builds and preserves muscle, keeps you feeling full, supports immune function.
- Carbohydrates — 4 calories per gram. Primary fuel source for the brain and during high-intensity exercise. Includes sugars, starches, and fibre.
- Fat — 9 calories per gram. Supports hormone production, fat-soluble vitamin absorption, and cell membrane integrity.
Every food you eat contains some combination of these three. Total daily calories = (protein grams × 4) + (carb grams × 4) + (fat grams × 9).
Step 1 — Calculate Your Calorie Target for Fat Loss
Before calculating macros, you need your daily calorie target. For fat loss, this means finding your Total Daily Energy Expenditure (TDEE) and then creating a deficit.
The Process
- Calculate your TDEE using the Mifflin-St Jeor equation (or use our calculator below)
- Subtract 300–500 kcal to create a fat loss deficit
- Use this reduced calorie target to set your macros
Example: A 30-year-old woman, 165 cm, 70 kg, moderately active has a TDEE of approximately 2,100 kcal. For fat loss, she targets 1,600 kcal/day (a 500 kcal deficit).
Calculate your TDEE and fat loss calorie target instantly — free, personalised to your stats.
Calculate My Calorie Target →Step 2 — Set Your Protein Target First
Protein is the most important macro during fat loss. Adequate protein intake preserves muscle mass while in a calorie deficit — without it, a significant portion of weight lost will be muscle rather than fat.
Research supports a protein intake of 1.6–2.4 g per kg of body weight per day during fat loss. Higher intakes (closer to 2.4 g/kg) are beneficial for people who train regularly or have significant muscle mass to preserve.
Protein Target Formula
Protein (g) = body weight (kg) × 2.0
Example: 70 kg woman × 2.0 = 140 g protein/day = 560 kcal from protein
Step 3 — Set Your Fat Target
Fat intake should not fall below approximately 0.6–0.8 g per kg of body weight per day during a calorie deficit. Going lower than this compromises hormone production — particularly sex hormones including testosterone and oestrogen — and reduces absorption of fat-soluble vitamins (A, D, E, K).
For most people, fat makes up 20–30% of total calories during fat loss. A reasonable starting point:
Fat Target Formula
Fat (g) = body weight (kg) × 0.8
Example: 70 kg woman × 0.8 = 56 g fat/day = 504 kcal from fat
Step 4 — Fill Remaining Calories with Carbohydrates
After setting protein and fat, carbohydrates fill the remaining calories. Carbs are flexible — they can go higher or lower based on personal preference and training demands without affecting fat loss, as long as total calories and protein are on target.
Carbohydrate Target Formula
Carbs (g) = (Total calories − protein calories − fat calories) ÷ 4
Example: (1,600 − 560 − 504) ÷ 4 = 536 ÷ 4 = 134 g carbs/day
Putting It All Together — Worked Example
Using our 30-year-old woman (165 cm, 70 kg, moderately active, targeting 1,600 kcal for fat loss):
| Macro | Grams | Calories | % of Total |
|---|---|---|---|
| Protein | 140 g | 560 kcal | 35% |
| Fat | 56 g | 504 kcal | 32% |
| Carbohydrates | 134 g | 536 kcal | 33% |
| Total | — | 1,600 kcal | 100% |
Protein
140 g/day
560 kcal
Carbs
134 g/day
536 kcal
Fat
56 g/day
504 kcal
Get your personalised macro targets for fat loss — calculated instantly based on your weight, calories and goal.
Calculate My Macros →Macro Targets for Different Goals
The protein-first approach applies across goals, but the overall split shifts depending on whether you are losing fat, maintaining, or building muscle:
| Goal | Protein | Carbs | Fat | Notes |
|---|---|---|---|---|
| Fat loss | 2.0–2.4 g/kg | Fill remaining | 0.8–1.0 g/kg | High protein preserves muscle in deficit |
| Maintenance / recomp | 1.6–2.0 g/kg | Fill remaining | 0.8–1.2 g/kg | Balanced approach for body composition |
| Muscle building | 1.6–2.2 g/kg | Fill remaining | 1.0–1.2 g/kg | Higher carbs support training performance |
High-Protein Foods to Hit Your Target
140 g of protein per day sounds like a lot — but it is achievable with smart food choices. Here are the most efficient protein sources:
| Food | Serving | Protein | Calories |
|---|---|---|---|
| Chicken breast (cooked) | 150 g | 45 g | 250 kcal |
| Greek yoghurt (0% fat) | 200 g | 20 g | 110 kcal |
| Eggs | 2 large | 12 g | 140 kcal |
| Canned tuna (in water) | 1 can (150 g drained) | 35 g | 150 kcal |
| Cottage cheese (low fat) | 200 g | 24 g | 140 kcal |
| Salmon (cooked) | 150 g | 34 g | 280 kcal |
| Whey protein shake | 1 scoop (30 g) | 24 g | 120 kcal |
| Lentils (cooked) | 200 g | 18 g | 230 kcal |
Should You Track Macros Strictly?
Strict macro tracking using a food diary app (MyFitnessPal, Cronometer, Lose It) is the most precise approach and works well for people who like structure and data. However, it is not the only way to succeed.
Alternatives that work for many people:
- Protein tracking only — hit your protein target and eat other foods to fullness within a calorie range. Simpler and sustainable for most people.
- The plate method — fill half your plate with vegetables, a quarter with protein, a quarter with carbs, and add a thumb-sized portion of healthy fat. No tracking required.
- Hand portions — a palm of protein, a fist of carbs, a cupped hand of vegetables, and a thumb of fat per meal. Roughly approximates macro targets for most people.
Common Mistakes When Tracking Macros
1. Not weighing food — using volume instead
A “cup” of rice can vary from 150–250 g depending on how tightly packed it is. The calories in 150 g cooked rice (~200 kcal) versus 250 g (~330 kcal) make a significant difference over time. Use a kitchen scale for accuracy, particularly for calorie-dense foods like nuts, oils, and grains.
2. Forgetting cooking oils and sauces
One tablespoon of olive oil adds 120 kcal. Many people track their chicken breast but not the oil it was cooked in, or their salad but not the dressing. These “invisible” calories are a common reason macros don’t produce expected results.
3. Setting protein too low
Many people default to 0.8–1.0 g protein per kg — the minimum recommended for sedentary adults. For active people in a calorie deficit, this is insufficient to prevent muscle loss. Aim for 1.6–2.4 g/kg when training during fat loss.
4. Slashing carbs too aggressively
Very low carbohydrate diets (below 50–100 g/day) reduce training performance, increase fatigue, and are difficult to sustain. Unless you are following a deliberate ketogenic protocol, keeping carbs at 30–40% of calories supports better energy and adherence.
Frequently Asked Questions
What is the best macro ratio for fat loss?
How many grams of protein per day to lose weight?
Can I lose fat without counting macros?
How often should I recalculate my macros?
What happens if I go over my carb macro but stay within calories?
The Bottom Line
To calculate your macros for fat loss: first determine your calorie target (TDEE minus 300–500 kcal), then set protein at 1.6–2.4 g per kg of body weight, set fat at 0.8–1.0 g per kg, and fill the remaining calories with carbohydrates.
Protein is the most important macro to get right — it is what determines whether the weight you lose is fat or muscle. Get protein right first, and adjust carbs and fat based on your preferences and energy levels.
Get your personalised macro targets for fat loss instantly — protein, carbs and fat based on your weight and calorie goal.
Calculate My Macros for Fat Loss →