How to Calculate Your Ideal Carb, Protein, and Fat Intake

Q: How many grams of protein should I eat per day?

The recommended dietary allowance (RDA) is 0.8g per kg of body weight, but this is a minimum for sedentary adults. For active individuals, most research supports 1.6–2.2g per kg (0.7–1g per pound) of body weight. This range supports muscle growth, recovery, and preservation during fat loss. For a 70kg (154 lb) person, that's 112–154g of protein per day.

Q: What percentage of my diet should be carbs, protein, and fat?

There's no single perfect ratio. For general health, the Acceptable Macronutrient Distribution Ranges (AMDR) are 45–65% carbs, 10–35% protein, and 20–35% fat. For specific goals: fat loss often uses 30–40% protein, 25–35% fat, and 25–35% carbs. Muscle gain typically uses 25–35% protein, 20–30% fat, and 40–55% carbs. Many nutritionists recommend setting protein first in grams, then fat, then filling remaining calories with carbs.

Q: Should I count macros or just calories?

Calories determine whether you gain or lose weight overall. But macros determine your body composition — how much of the change is fat versus muscle. For basic weight management, calorie counting alone can work. For optimal body composition, energy levels, and satiety, tracking macros gives you significantly better results. Start with calories if you're new, then graduate to macro tracking.

Q: How do I calculate macros for fat loss?

Step 1: Calculate your TDEE using an online calculator. Step 2: Subtract 300–500 calories for a moderate deficit. Step 3: Set protein at 1.6–2.2g per kg of body weight. Step 4: Set fat at 0.6–1g per kg. Step 5: Fill remaining calories with carbs. For example, a 75kg person with a TDEE of 2,400 kcal targeting 2,000 kcal: protein = 150g (600 kcal), fat = 65g (585 kcal), carbs = 204g (815 kcal).

Q: What are macronutrients?

Macronutrients (macros) are the three main types of nutrients your body needs in large amounts: carbohydrates, proteins, and fats. Carbs provide 4 calories per gram and are your body's primary energy source. Protein provides 4 calories per gram and is essential for building and repairing muscle, skin, hair, and organs. Fat provides 9 calories per gram and is critical for hormone production, nutrient absorption, and brain function.

Nutrition 2026-04-13 By RiseTop Team ⏱ 11 min read

Whether you're trying to lose fat, build muscle, or simply eat healthier, understanding macronutrients — carbohydrates, proteins, and fats — is the foundation of any successful nutrition plan. Counting macros gives you precise control over your body composition, energy levels, and overall health in a way that simple calorie counting cannot match. This guide walks you through every step, with formulas, examples, and goal-specific recommendations.

What Are Macronutrients?

Macronutrients (commonly called "macros") are the three categories of nutrients that provide your body with energy. Every food you eat is made up of some combination of these three:

Carbohydrates — 4 calories per gram. Your body's preferred energy source, especially for high-intensity activity and brain function. Found in grains, fruits, vegetables, legumes, and sugars.
Protein — 4 calories per gram. The building block of muscle, skin, hair, enzymes, and immune cells. Found in meat, fish, eggs, dairy, beans, and soy products.
Fat — 9 calories per gram. Essential for hormone production, vitamin absorption (A, D, E, K), cell membrane structure, and brain health. Found in oils, butter, nuts, avocado, and fatty fish.

Alcohol is sometimes called a "fourth macronutrient" at 7 calories per gram, but it's not essential and is generally minimized in nutrition planning.

Step 1: Calculate Your Total Daily Energy Expenditure (TDEE)

Before you can set your macros, you need to know how many calories your body burns in a day. This is your Total Daily Energy Expenditure, which combines your Basal Metabolic Rate (BMR) — the energy your body uses at complete rest — with your activity level.

The Mifflin-St Jeor Equation (Most Accurate)

Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161

Then multiply your BMR by an activity factor:

Activity Level	Multiplier	Description
Sedentary	1.2	Desk job, little to no exercise
Lightly Active	1.375	Light exercise 1–3 days/week
Moderately Active	1.55	Moderate exercise 3–5 days/week
Very Active	1.725	Hard exercise 6–7 days/week
Extremely Active	1.9	Athlete or very physical job

Example: A 30-year-old woman, 165cm, 65kg, who exercises 4 days per week:
BMR = (10 × 65) + (6.25 × 165) − (5 × 30) − 161 = 650 + 1031.25 − 150 − 161 = 1,370 kcal
TDEE = 1,370 × 1.55 = 2,124 kcal/day

🔢 Don't want to do the math by hand?

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Step 2: Adjust Calories for Your Goal

Your TDEE represents maintenance — eating this amount keeps your weight stable. To achieve a specific goal, adjust accordingly:

Fat Loss: Subtract 300–500 calories (a moderate, sustainable deficit). Larger deficits lead to faster weight loss but also muscle loss and metabolic adaptation.
Muscle Gain: Add 200–400 calories (a lean surplus). Going higher leads to more fat gain alongside muscle.
Maintenance: Eat at your TDEE. Good for body recomposition (losing fat while building muscle simultaneously, especially for beginners or detrained individuals).

Pro Tip: Avoid aggressive deficits below 1,200 calories for women or 1,500 calories for men. Severe restriction leads to muscle loss, hormonal disruption, nutrient deficiencies, and binge eating cycles.

Step 3: Set Your Protein Intake

Protein should be set first because it's the most important macro for body composition. The evidence is clear: higher protein intake preserves muscle during fat loss, promotes muscle growth during a surplus, and increases satiety across all goals.

Goal	Protein Recommendation	Per Pound of Body Weight
Sedentary / General Health	0.8–1.0 g/kg	0.36–0.45 g/lb
Fat Loss	1.6–2.4 g/kg	0.7–1.1 g/lb
Muscle Gain	1.6–2.2 g/kg	0.7–1.0 g/lb
Athletes / Heavy Training	1.6–2.2 g/kg	0.7–1.0 g/lb

Example (65kg woman, fat loss): 65kg × 2.0g = 130g protein/day (520 calories)

Research Note: A landmark 2018 meta-analysis by Morton et al. found that protein intakes above 1.62 g/kg provide no additional muscle-building benefit in trained individuals. However, higher intakes (up to 2.4 g/kg) during fat loss help preserve lean mass.

Step 4: Set Your Fat Intake

Fat is essential — going too low causes hormonal problems, especially for women. Set fat as a range based on body weight:

Minimum: 0.6 g/kg (the lowest you should go; below this, hormone levels can drop)
Recommended range: 0.8–1.2 g/kg for most people
Higher fat / lower carb: 1.2–1.8 g/kg (for keto or low-carb approaches)

Example (65kg woman): 65kg × 1.0g = 65g fat/day (585 calories)

Step 5: Fill Remaining Calories with Carbs

Carbs get whatever's left. Here's the formula:

Carbs (grams) = (Total Calories − Protein Calories − Fat Calories) ÷ 4

Full Example (65kg woman, fat loss at 1,700 kcal):

Protein: 130g × 4 = 520 kcal
Fat: 65g × 9 = 585 kcal
Remaining for carbs: 1,700 − 520 − 585 = 595 kcal
Carbs: 595 ÷ 4 = 149g/day

Final macros: 130g protein / 65g fat / 149g carbs = 1,700 kcal

Macro Profiles by Goal

Macro	Fat Loss	Muscle Gain	Maintenance	Keto / Low-Carb
Protein	30–40%	25–35%	20–30%	20–30%
Fat	25–35%	20–30%	25–35%	60–75%
Carbs	25–35%	40–55%	40–55%	5–10%

⚖️ Need to know your BMI for a starting baseline?

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Protein Sources by Quality

Source	Protein per 100g	Notes
Chicken breast	31g	Lean, versatile, affordable
Greek yogurt	10g	High protein, contains probiotics
Eggs	13g (per 100g)	Complete protein, 6g per large egg
Salmon	20g	Rich in omega-3 fatty acids
Lentils	9g	Plant-based, also high in fiber
Whey protein	80g (per 100g powder)	Fast-absorbing, convenient
Tofu	8g	Plant-based, versatile
Beef (lean)	26g	Rich in iron, B12, and zinc

Common Mistakes in Macro Tracking

Not weighing food: Eyeballing portions leads to underestimating calorie intake by 20–50%. Invest in a digital kitchen scale.
Ignoring cooking oils and sauces: A tablespoon of olive oil is 120 calories. These add up quickly.
Going too low on fat: Below 0.6g/kg, you risk hormonal disruption, poor vitamin absorption, and gallbladder issues.
Obsessing over perfect ratios: Getting within 5–10% of your targets is excellent. Perfect is the enemy of good.
Not adjusting over time: As you lose weight, your TDEE drops. Recalculate your macros every 5–10 lbs of weight change.
Ignoring fiber: While not a macronutrient, fiber (25–35g/day) is crucial for gut health, satiety, and blood sugar regulation.

Tracking Your Macros: Practical Tips

You don't need to track macros forever. Most people find that after 4–8 weeks of tracking, they develop an intuitive sense of portion sizes. Here's how to start:

Use an app: MyFitnessPal, Cronometer, or MacroFactor make tracking easy with barcode scanning and food databases.
Weigh everything: Use a food scale. "One cup of rice" can vary by 100+ calories depending on how you scoop it.
Plan ahead: Pre-log your meals in the morning or the night before. This prevents end-of-day surprises.
Don't stress about every gram: If you're within 5g of each macro target, you're doing great.
Focus on whole foods: Lean proteins, vegetables, whole grains, and healthy fats make it much easier to hit your targets while feeling full and satisfied.

Frequently Asked Questions

How many grams of protein should I eat per day?

For active adults, aim for 1.6–2.2g per kg of body weight (0.7–1g per pound). For a 70kg person, that's 112–154g per day. Sedentary adults need at least 0.8g/kg.

What percentage of my diet should be carbs, protein, and fat?

It depends on your goal. For general health: 45–65% carbs, 10–35% protein, 20–35% fat. Many nutritionists recommend setting protein in grams first, then fat, then filling remaining calories with carbs.

Should I count macros or just calories?

Calories control weight gain or loss. Macros control body composition — how much is fat versus muscle. For best results, especially if you have a body composition goal, tracking macros is superior to calories alone.

How do I calculate macros for fat loss?

Calculate your TDEE, subtract 300–500 calories, set protein at 1.6–2.4g/kg, set fat at 0.6–1.0g/kg, and fill remaining calories with carbs.

What are macronutrients?

Macros are the three nutrients your body needs in large amounts: carbohydrates (4 kcal/g), protein (4 kcal/g), and fat (9 kcal/g). They provide energy and serve critical structural and functional roles in your body.