Protein, carbs, and fat targets built around your exact goal and diet style, Keto, Low-Carb, High-Protein, Standard, Paleo, or High-Carb. Includes a meal-by-meal breakdown and per-goal comparison table.
Of the three macronutrients, protein is the most critical to get right. Aim for 0.7-1g per pound of body weight for anyone active or trying to maintain muscle. Once protein is set, distribute remaining calories between carbs and fat based on preference and lifestyle, both work for weight loss when protein is adequate. The specific carb-to-fat ratio matters far less than most people think.
Macronutrients (protein, carbohydrates, and fat) are the three categories of nutrients that provide your body with energy (calories). Every food you eat contains some combination of the three. “Tracking macros” means setting daily gram targets for each macronutrient and eating to hit those targets, rather than simply counting total calories. This approach, popularized as IIFYM (If It Fits Your Macros), gives you more flexibility and control over body composition than calorie counting alone.
The reason macros matter beyond calories: protein and carbohydrate each provide 4 calories per gram, while fat provides 9 calories per gram. You can eat the same total calories with dramatically different body composition outcomes depending on how those calories are distributed. A high-protein diet at a caloric deficit preserves lean muscle while losing fat. A high-carbohydrate diet fuels intense training sessions. A ketogenic diet (very low carb, high fat) shifts the body’s primary fuel source from glucose to ketone bodies derived from fat.
The calculator uses the Mifflin-St Jeor equation to estimate your Basal Metabolic Rate (resting calorie burn), multiplies by your activity level to get Total Daily Energy Expenditure (TDEE), then applies a calorie adjustment for your goal. Macros are then distributed from that calorie target according to your chosen diet style.
| Goal | Calorie Adjustment | Expected Rate | Protein Priority |
|---|---|---|---|
| Aggressive Loss | −750 cal/day | ~0.7 kg / 1.5 lbs per week | 2.4 g/kg, maximum muscle preservation |
| Moderate Loss | −500 cal/day | ~0.45 kg / 1 lb per week | 2.2 g/kg, high preservation |
| Maintenance | 0 | No change | 1.8 g/kg, general health |
| Lean Gain | +250 cal/day | ~0.25 kg / 0.5 lbs per week | 2.0 g/kg, support muscle growth |
| Muscle Gain | +500 cal/day | ~0.45 kg / 1 lb per week | 2.2 g/kg, maximize synthesis |
| Aggressive Gain | +750 cal/day | ~0.7 kg / 1.5 lbs per week | 2.2 g/kg, bulk support |
The balanced baseline recommended by most general nutrition guidelines. Adequate protein for muscle maintenance, enough carbohydrates to fuel moderate exercise, and sufficient fat for hormone production. Best for: people new to macro tracking, those with no specific dietary restrictions, and anyone doing moderate-intensity exercise 3–5 days per week.
Reduces carbohydrate to below 25% of calories while keeping fat moderately elevated. Not as extreme as keto but provides many of the benefits: reduced insulin spikes, improved fat oxidation, and easier appetite control for many people. Best for: those who find high-carb diets leave them hungry, people with insulin sensitivity concerns, and athletes doing primarily strength training rather than endurance work.
Prioritizes carbohydrate as the primary fuel source. Fat is kept low to allow calories for carbohydrates. Best for: endurance athletes (runners, cyclists, swimmers), people doing high-volume training, and those who perform better with glycogen-fueled workouts. Not ideal for people who are insulin-resistant or sedentary.
The ketogenic diet restricts carbohydrates to roughly 20–50g per day (5% of calories) to induce nutritional ketosis, a metabolic state in which the liver converts fat into ketone bodies for fuel. Effective for fat loss in some individuals and has clinical applications for epilepsy and metabolic syndrome. Best for: people who have tried other approaches without success, those with documented insulin resistance, and anyone willing to commit to a strict carbohydrate restriction. Requires electrolyte management (sodium, potassium, magnesium) during adaptation.
Pushes protein well above the standard recommendation. The elevated thermic effect of protein (25–30% of protein calories are burned in digestion vs. 5–10% for carbs and fat) creates a small additional metabolic advantage. Best for: people cutting calories aggressively who want maximum muscle preservation, natural bodybuilders, and anyone who finds high protein intake controls hunger effectively.
Approximately mirrors the macronutrient profile of a whole-foods diet emphasizing meat, fish, vegetables, fruit, nuts, and seeds while excluding processed foods, grains, and dairy. The macro split is similar to low-carb but with moderate rather than high fat. Best for: people focused on food quality over macro optimization, those with digestive sensitivities to grains or dairy, and anyone who prefers a food-first rather than numbers-first approach.
Protein has a uniquely important role in body composition. It is the only macronutrient that directly supports muscle protein synthesis, the process that builds and repairs muscle tissue. Research consistently supports a target of 1.6–2.2 g per kg of body weight per day for active individuals, with higher ends of the range (2.2–2.4 g/kg) beneficial during caloric restriction when muscle loss risk is highest.
Distributing protein across meals also matters. Research suggests that muscle protein synthesis is maximized with doses of approximately 0.4 g/kg per meal (roughly 30–40g for most people), with diminishing returns per meal above that threshold. This is why the Meal Planner in this calculator distributes protein across 3–6 meals with weighted amounts.
Carbohydrates are the body’s preferred fuel for high-intensity exercise. Stored as muscle and liver glycogen, carbohydrates are essential for performance in any activity above 65% of VO2 max. For sedentary individuals or those doing low-intensity exercise, carbohydrate needs are significantly lower and fat can serve as an adequate fuel source.
For athletes, prioritizing carbohydrate intake around training (before and after workouts) maximizes performance and glycogen resynthesis without requiring more total carbohydrate. This nutrient timing approach allows training performance similar to high-carb diets while keeping total carbohydrate intake moderate.
Fat is often minimized in fitness nutrition, but it has a hard floor: a minimum of 20% of total calories from fat is recommended to maintain adequate testosterone production, cell membrane integrity, and absorption of fat-soluble vitamins (A, D, E, K). Dropping fat below 15% of calories is associated with hormonal disruption, particularly in women. The ceiling on dietary fat (outside of a ketogenic approach) is flexible, the body can effectively use fat for fuel at any intake level, provided total calories and protein are appropriate.
Essential for accurate macro tracking, volume measurements are too imprecise
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