Macro Calculator

What Should Your Macros Be?

“If it fits your macros” isn’t just a fitness catchphrase — it’s a fundamentally sound approach to nutrition. Macronutrients (macros) are the three categories of nutrients your body needs in large quantities: protein, carbohydrates, and fat. Each serves different functions, and the ratio you consume directly impacts your body composition, energy, performance, and health.

Our macro calculator estimates your optimal daily intake of each macronutrient based on your TDEE (total daily energy expenditure), body weight, activity level, and goal — whether that’s losing fat, building muscle, or maintaining your current physique.

Quick example: A 170 lb moderately active male aiming to lose fat might target approximately 2,100 calories with macros of 170g protein (40%), 185g carbs (35%), and 58g fat (25%). The same person aiming to build muscle might target 2,800 calories with 170g protein (24%), 350g carbs (50%), and 82g fat (26%).

How Macros Are Calculated

Every gram of protein contains 4 calories. Every gram of carbohydrate contains 4 calories. Every gram of fat contains 9 calories. (Alcohol contains 7 calories per gram but is not a macronutrient.) These conversion factors are how we translate a calorie target into gram targets for each macro.

Our calculator follows a research-backed priority order. Protein is set first based on body weight, because protein needs are relatively fixed regardless of total calorie intake. Fat is set second at a minimum threshold for hormonal health and nutrient absorption. Carbohydrates fill the remaining calories, since carb needs are the most flexible and adjust naturally to your overall calorie target.

The specific ratios depend on your goal. Fat loss protocols generally increase protein percentage (to preserve muscle during a deficit) and moderate carbs and fats. Muscle gain protocols increase overall calories with a focus on carbohydrates (to fuel training and recovery) while keeping protein adequate. Maintenance keeps a balanced ratio suitable for long-term sustainability.

The Three Macronutrients Explained

Protein is the building block of muscle tissue and plays critical roles in immune function, enzyme production, hormone synthesis, and cellular repair. When it comes to body composition, protein is the most important macro. During a calorie deficit, adequate protein prevents muscle loss. During a surplus, it supports muscle growth.

How much? Research consistently supports 0.7–1.0 grams per pound of body weight for people who resistance train. For sedentary individuals, 0.5–0.7g/lb is sufficient. For athletes in a deep calorie deficit, up to 1.2g/lb may be beneficial.

Protein sources: Lean meats (chicken breast, turkey, lean beef), fish (salmon, tuna, cod), eggs, Greek yogurt, cottage cheese, whey protein powder, legumes, tofu, and tempeh. Animal sources provide complete protein profiles, while most plant sources need to be combined for complete amino acid coverage.

Carbohydrates are your body’s preferred energy source, particularly for high-intensity exercise. They’re stored as glycogen in muscles and the liver, fueling workouts and daily activity. Carbs also support brain function — your brain runs primarily on glucose.

How much? This varies the most by goal and activity. Active individuals who train intensely need 1.5–3.0g per pound of body weight. Moderate exercisers need 1.0–1.5g/lb. Sedentary individuals or those on fat loss plans may reduce to 0.5–1.0g/lb. Very low-carb diets (under 50g/day for ketosis) work for some people but aren’t necessary for fat loss.

Carb sources: Whole grains (oats, brown rice, quinoa), potatoes, sweet potatoes, fruits, vegetables, beans, lentils, and whole-grain bread. Prioritize complex, fiber-rich carbs over refined sugars for sustained energy and satiety.

Dietary fat is essential for hormone production (including testosterone and estrogen), vitamin absorption (vitamins A, D, E, K are fat-soluble), cellular membrane integrity, and brain health. Cutting fat too low impairs all of these functions.

How much? A minimum of 0.3g per pound of body weight, or approximately 20–25% of total calories, maintains hormonal health. Most people thrive at 25–35% of calories from fat. Going below 15% of calories from fat for extended periods can disrupt hormones, particularly in women.

Fat sources: Olive oil, avocados, nuts (almonds, walnuts, macadamias), seeds (chia, flax), fatty fish (salmon, sardines, mackerel), eggs, and cheese. Limit saturated fat to under 10% of total calories, and minimize trans fats entirely.

Macro Ratios by Goal

Fat loss (moderate deficit): A common evidence-based split is 40% protein, 35% carbs, 25% fat. The elevated protein percentage preserves muscle during the deficit. Example at 2,000 calories: 200g protein, 175g carbs, 56g fat.

Fat loss (aggressive deficit): 45% protein, 30% carbs, 25% fat. Higher protein percentage is critical when the deficit is steeper, as muscle loss risk increases. Example at 1,700 calories: 191g protein, 128g carbs, 47g fat.

Muscle gain (lean bulk): 25% protein, 50% carbs, 25% fat. Higher carbs fuel intense training and recovery. Protein stays adequate but doesn’t need the inflated percentage of a deficit since calories are abundant. Example at 3,000 calories: 188g protein, 375g carbs, 83g fat.

Maintenance / recomposition: 30% protein, 40% carbs, 30% fat. A balanced ratio sustainable long-term, supporting both performance and body composition. Example at 2,500 calories: 188g protein, 250g carbs, 83g fat.

Ketogenic: 5–10% carbs, 70–75% fat, 20–25% protein. A specialized approach that shifts the body to using fat (ketones) as its primary fuel source. Requires strict carb restriction (typically under 20–50g/day net carbs). Effective for some people but not necessary for fat loss and difficult to sustain for many.

Tracking Macros in Practice

Food scales are the most accurate way to track. Weigh food raw when possible (cooking changes weight due to water loss). A $15 digital kitchen scale is the single most impactful tool for nutrition accuracy. Even two weeks of scale use dramatically improves your ability to estimate portions by eye.

Tracking apps like MyFitnessPal, Cronometer, MacroFactor, and Carbon Diet Coach make logging meals fast. Scan barcodes, search databases, or build custom recipes. Cronometer is the most accurate for micronutrient data. MacroFactor adapts your targets based on real-world weight trends.

Meal prepping simplifies tracking by reducing decision-making. Prepare 3–5 protein/carb/fat combinations for the week, calculate macros once, and eat known quantities. This eliminates the friction of logging every ingredient at every meal.

The 80/20 approach works for sustainability. Track 80% of your intake meticulously (meals you prepare at home) and estimate the other 20% (restaurant meals, social eating). Perfect tracking isn’t required — directional accuracy over time produces results.

When to stop tracking. Once you’ve tracked consistently for 3–6 months, most people develop enough intuitive understanding of portions and macro content to eat appropriately without logging every meal. Use periodic check-in weeks (tracking for 5–7 days) to verify you haven’t drifted significantly from your targets.

Common Macro Mistakes

Not prioritizing protein. Protein is the hardest macro to overconsume and the most important for body composition. Many people eat too little protein and too many carbs and fats by default. Front-load protein at each meal to ensure you hit your target.

Fearing dietary fat. Fat doesn’t make you fat — excess calories make you fat. Dietary fat is essential for health, and very low-fat diets can impair hormonal function. Keep fat at a minimum of 20% of calories.

Treating all carbs equally. 50g of carbs from oats performs differently in your body than 50g from candy. Fiber content, glycemic response, micronutrient density, and satiety all differ. Prioritize whole, unprocessed carb sources for the majority of your intake.

Ignoring fiber. Fiber isn’t a macro but dramatically affects satiety, digestive health, and blood sugar stability. Aim for 25–35g of fiber daily. Most Americans consume only 15g. Vegetables, fruits, legumes, and whole grains are the best sources.

Obsessing over exact ratios. Hitting your protein target is critical. After that, the carb/fat split is flexible. Some people perform better with higher carbs, others prefer higher fat. Experiment with ratios within your calorie target and find what makes you feel best, perform best, and is most sustainable.