Macro Calculator
Turn a calorie target into grams of protein, carbs, and fat — anchored to your body weight, the way coaches actually set it.
Calculate your macros
How macros are set
Calories decide whether you gain or lose; macros decide what the change is made of. The standard coaching approach anchors protein to body weight (0.8–1 gram per pound — higher when cutting, to protect muscle), sets fat around 25–30% of calories (hormone production needs it), and gives carbohydrates the remainder to fuel training and life. The energy math: protein and carbs are 4 calories per gram, fat is 9.
A worked example
2,400 calories, 180 lb, maintaining: protein 144 g (576 cal), fat ~72 g (648 cal), carbs fill the rest at ~294 g (1,176 cal). Switch the goal to fat loss and protein rises to 180 g while carbs absorb the cut — you lose weight while giving your muscles the strongest possible reason to stay.
What matters and what doesn't
In order: total calories first, protein second, the carb/fat split a distant third — research repeatedly shows fat loss is similar on high-carb and low-carb diets when calories and protein match. So hit protein daily (it's the macro people miss), spread it across 3–4 meals, and let carbs and fat flex with your preferences. Foods that make the targets easy: lean meats, Greek yogurt, eggs, fish, rice, potatoes, oats, fruit, olive oil, nuts. Perfection isn't required — being within ~10 grams on protein and ~100 calories overall, most days, is what results are made of.
Frequently asked questions
Is 1 gram of protein per pound really necessary?
It's a ceiling more than a floor — research supports 0.7–1 g/lb for active people, with the higher end most valuable in a calorie deficit. More than that isn't harmful for healthy kidneys, just usually unnecessary.
Should I do low-carb or low-fat?
Whichever you'll stick to. With calories and protein equal, fat-loss outcomes are similar. Low-carb suits people who love meat and feel steady without bread; higher-carb suits people who train hard. Adherence is the active ingredient.
Do I count fiber and sugar separately?
Fiber counts inside carbs; aim for roughly 14 g per 1,000 calories for health. Sugar fits within your carb budget — a diet of mostly whole foods handles both automatically without separate accounting.
What about alcohol?
Alcohol is ~7 calories per gram and belongs to no macro. Count a drink as ~100–150 calories taken from your carb and fat budget — and know it's the easiest place for a deficit to silently vanish.
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What macronutrients are and why they matter
Macronutrients are the three categories of nutrients that provide calories: protein (4 calories/gram), carbohydrates (4 calories/gram), and fat (9 calories/gram). Every food you eat is some combination of these three — tracking them lets you optimize body composition, energy, and performance beyond just total calorie counting.
Your macro targets depend on your total calorie target and your goals. The calculator above starts from your TDEE (Total Daily Energy Expenditure), applies your goal adjustment, and then distributes calories across macros based on evidence-based ratios for your specific objective.
Recommended macro ratios by goal
Fat loss: Protein 35–40% / Fat 25–35% / Carbs 25–35%. High protein preserves muscle during a calorie deficit. Lower carbs are common for fat loss but not required — total calorie deficit is what drives fat loss. Minimum protein: 0.7–1.0g per pound of body weight.
Muscle gain: Protein 25–30% / Fat 20–30% / Carbs 40–50%. More carbohydrates support training intensity and recovery. Protein target: 0.8–1.0g per pound of body weight minimum.
Athletic performance / maintenance: Protein 20–25% / Fat 25–35% / Carbs 45–55%. Higher carbohydrates fuel performance and recovery. Protein target: 0.7–0.9g per pound.
Why protein is the most important macro regardless of goal
Protein is the only macronutrient that directly builds and repairs muscle tissue. It also has the highest thermic effect of feeding (TEF) — your body burns roughly 25–30% of protein calories just digesting it, versus 5–10% for carbs and 0–3% for fat. This is why high-protein diets support fat loss even at the same total calorie intake. It also promotes satiety better than either carbohydrates or fat, making it easier to maintain a calorie deficit without feeling hungry.
Frequently asked questions
Do I need to hit my macros exactly every day?
No. Macro targets are daily averages, not precise daily requirements. Hitting your protein target consistently matters most; carb and fat ratios can vary considerably day-to-day without affecting results. Many successful athletes and bodybuilders track weekly averages rather than daily totals.
What happens if I eat too little protein?
During a calorie deficit, inadequate protein leads to muscle loss — your body catabolizes muscle tissue for energy and amino acids. This reduces your metabolic rate and makes long-term fat loss harder. During a calorie surplus with low protein, extra calories go primarily to fat rather than muscle. Protein is non-negotiable for body composition goals in either direction.
Is fat bad for fat loss?
No. Dietary fat does not directly cause body fat accumulation — total calorie surplus does. Fat is essential for hormone production, fat-soluble vitamin absorption (A, D, E, K), and satiety. Cutting fat below 20% of calories long-term can disrupt hormone levels, particularly testosterone and estrogen. A moderate fat intake (25–35% of calories) is appropriate for most goals.
How do carbohydrates affect body composition?
Carbohydrates are stored as glycogen in muscles and liver — not automatically as body fat. Glycogen is the primary fuel for high-intensity exercise. Reducing carbs reduces glycogen stores, which reduces training performance but also causes initial water weight loss (glycogen is stored with 3g of water per gram). Whether to eat higher or lower carbs depends on training intensity and individual response, not a universal rule.
Disclaimer: Macro targets are general guidelines. Individual needs vary. Consult a registered dietitian for personalized nutrition guidance, especially if you have a medical condition.