Calculate your ideal protein, carb, and fat targets for weight loss, muscle gain, or maintenance. Includes macro ratios, calorie math, and example breakdowns.
General guidelines for active adults
Use our calorie calculator to get your TDEE, then set your macro targets based on your specific goal.
Open Calorie CalculatorMacronutrients — protein, carbohydrates, and fat — are the three categories of nutrients that provide all the calories in your diet. While total calorie intake determines whether you gain or lose weight, your macro distribution determines your body composition: the ratio of muscle to fat you carry, your energy levels, hormonal function, and workout performance. Tracking macros (popularized as IIFYM — If It Fits Your Macros) gives you precise control over these outcomes.
Each macronutrient has a distinct caloric density and serves different metabolic functions. Protein and carbohydrates each provide 4 calories per gram. Fat provides 9 calories per gram, making it more than twice as calorie-dense. Understanding this math is the foundation of macro tracking.
Protein is essential for muscle synthesis, immune function, enzyme production, and satiety. For body composition goals — whether cutting or bulking — protein is the most critical macro to get right. General recommendations for active individuals:
• Minimum RDA: 0.36g per pound of body weight (insufficient for muscle goals)
• For muscle preservation during weight loss: 0.7–1g per pound
• For muscle building: 0.7–1g per pound
• Example: 180 lb person → 126–180g protein/day (504–720 calories from protein)
Carbohydrates are the body's preferred fuel source for high-intensity exercise. They replenish muscle glycogen, fuel the brain, and support thyroid function and hormonal balance. Despite the popularity of low-carb diets, most active people perform better with adequate carb intake. The DRI recommends 45–65% of calories from carbohydrates. For athletes and active individuals, carbs around workouts (pre and post-training) are particularly important for performance and recovery.
Dietary fat is required for production of sex hormones (testosterone, estrogen), absorption of fat-soluble vitamins (A, D, E, K), brain function, and cell membrane integrity. Eating too little fat can disrupt hormonal balance and impair health. The DRI recommends 20–35% of calories from fat. Even on a weight loss diet, aim for at least 0.35–0.4g per pound of body weight in fat to maintain hormonal function.
At 2,000 calories/day (Balanced Maintenance):
Protein: 150g (600 cal / 30%) | Carbs: 225g (900 cal / 45%) | Fat: 56g (504 cal / 25%)
At 1,600 calories/day (Weight Loss — High Protein):
Protein: 160g (640 cal / 40%) | Carbs: 130g (520 cal / 33%) | Fat: 49g (441 cal / 27%)
At 3,000 calories/day (Muscle Gain — Lean Bulk):
Protein: 200g (800 cal / 27%) | Carbs: 350g (1,400 cal / 47%) | Fat: 89g (800 cal / 27%)
Step 1: Calculate your TDEE using our calorie calculator. Step 2: Set your calorie target (TDEE for maintenance, TDEE−500 for weight loss, TDEE+300 for lean bulk). Step 3: Prioritize protein first (0.7–1g/lb body weight). Step 4: Fill remaining calories with carbs and fat based on your preference and goals. Step 5: Use a food tracking app (MyFitnessPal, Cronometer) to log intake against targets.
No — you can lose weight by simply being in a calorie deficit, regardless of macro split. However, tracking macros (especially protein) helps preserve muscle during weight loss, improves satiety, and leads to better body composition results. Even loosely tracking protein is significantly better than ignoring macros entirely.
Excess protein is converted to glucose or fat for energy storage — it is not wasted, but it does not provide additional muscle-building benefit beyond the saturation point of ~0.8–1g/lb/day. For healthy adults without kidney disease, high protein intake is safe. Concern about protein harming healthy kidneys is not supported by current evidence.
When calories and protein are equated, fat loss is equivalent between low-carb and higher-carb diets. Keto may offer short-term advantages from water weight loss and appetite suppression for some individuals, but long-term fat loss depends on total calorie balance. Choose the macro split you can sustain most consistently.
Set protein first: multiply body weight in lbs by 0.8 for grams, then multiply grams × 4 for calories. Set fat: multiply total calories by 0.25, then divide by 9 for grams. Fill remaining calories with carbs: remaining calories ÷ 4 = grams of carbs. Adjust percentages based on your goal and preference.