Macro Calculator
Calculate your daily protein, carbohydrate, and fat targets in grams — choose a preset or set your own macro split to match your fitness goal.
Calories
Macro Split
| Grams | Calories | Split | Per Meal* | |
|---|---|---|---|---|
| Protein | — | — | — | — |
| Carbs | — | — | — | — |
| Fat | — | — | — | — |
What Are Macros?
Macronutrients ("macros") are the three nutrient categories that provide calories: protein (4 calories per gram), carbohydrates (4 calories per gram), and fat (9 calories per gram). Alcohol is technically a fourth macronutrient at 7 calories per gram, but it provides no nutritional benefit and is not included in standard macro tracking.
Tracking macros means monitoring the grams of each you eat rather than just total calories. This matters because the same calorie total can produce very different outcomes depending on where those calories come from. A 2,000 calorie diet with 40% protein supports muscle retention far better than one with 15% protein, even though the calorie total is identical.
Protein: The Priority Macro
Protein is the most important macronutrient for body composition. It has three unique advantages: it preserves and builds muscle tissue, it has the highest thermic effect (your body burns 20–30% of protein calories just digesting it), and it is the most satiating macro per calorie.
Research consistently shows optimal protein intake for active adults is 1.6–2.2 grams per kilogram of body weight per day. During a caloric deficit, aim for the upper end (2.0–2.2 g/kg) to minimize muscle loss. For muscle gain, 1.6–2.0 g/kg is sufficient since the caloric surplus itself supports protein synthesis.
Carbohydrates: Performance Fuel
Carbohydrates are stored as glycogen in muscles and the liver, providing the primary fuel for moderate-to-high intensity exercise. Low carbohydrate intake impairs workout performance, recovery, and anaerobic power output. For most active people, 3–5 g/kg body weight per day is appropriate; endurance athletes may need 5–8 g/kg.
The quality of carbohydrates matters more than the quantity for health. Prioritize whole grains, fruits, vegetables, and legumes over refined sugars and processed starches. Fiber intake (25–38 g/day) is naturally high when carbohydrate sources are minimally processed.
Fat: Essential, Not Optional
Dietary fat is essential for hormone production (including testosterone and estrogen), vitamin absorption (A, D, E, K are fat-soluble), cell membrane integrity, and brain function. Going below 20% of total calories from fat can impair hormonal function, particularly in women.
Aim for at least 0.5 g/kg body weight from fat per day as a floor. Beyond that minimum, fat intake is flexible — it fills the remaining calories after protein and carbohydrate needs are met. Prioritize unsaturated fats (olive oil, nuts, avocado, fatty fish) while limiting saturated and trans fats.
Choosing a Preset
- Balanced (30/40/30): A moderate, sustainable split suitable for general health and fitness. Works well for most people not pursuing extreme body composition goals.
- High Protein (40/30/30): Prioritizes muscle retention during fat loss or supports muscle gain. Best when combined with resistance training.
- Low Carb (35/25/40): Reduces carbohydrates in favor of fat. May improve satiety and blood sugar control for some. Not ideal for high-intensity training.
- Low Fat (25/55/20): Maximizes carbohydrate intake for endurance performance. Suitable for runners, cyclists, and other endurance athletes with high glycogen demands.
Frequently Asked Questions
What are macros?
Macronutrients are the three calorie-providing nutrient categories: protein (4 cal/g), carbohydrates (4 cal/g), and fat (9 cal/g). Tracking macros means monitoring grams of each rather than just total calories, giving more control over body composition, energy, and performance.
What is the best macro ratio for weight loss?
Higher protein (30–40%) is generally best for fat loss — it preserves muscle, has the highest thermic effect, and is the most satiating macro. A common starting split is 40/30/30 (protein/carbs/fat). Adjust based on training style and preferences.
How much protein do I need per day?
Active adults: 1.6–2.2 g/kg body weight per day. During a deficit, aim for the upper end (2.0–2.2 g/kg). Sedentary adults: 0.8 g/kg minimum, though most benefit from more. Protein is the single most important macro to hit consistently.
Do I need to hit my macros exactly?
No — within 5–10 grams of each target is sufficient. Prioritize hitting protein first, then let carbs and fat flex as needed. Total calories matter most for weight change; macro ratios matter for body composition and performance.
What is the best macro ratio for muscle gain?
Prioritize protein at 1.6–2.0 g/kg bodyweight. Fill remaining calories with carbs (for training fuel) and fat (for hormones). A common split: 30–35% protein, 40–45% carbs, 20–25% fat. The caloric surplus itself is what drives muscle growth — macros optimize the quality of that growth.