Calculate your daily protein, carbohydrate, and fat targets — get evidence-based macro splits for weight loss, muscle gain, maintenance, or keto based on your TDEE and goals.
This macro calculator is designed for adults who want concrete daily gram targets for protein, carbohydrates, and fat rather than just a calorie number. You'll enter your age, sex, height, weight, and activity level, then select your goal: fat loss, muscle gain, maintenance, or a custom split. The tool first estimates your Total Daily Energy Expenditure (TDEE) using the Mifflin-St Jeor equation, then distributes calories across the three macronutrients according to evidence-based ranges. The USDA AMDR sets protein at 10–35%, carbohydrates at 45–65%, and fat at 20–35% of total calories — but optimal splits shift within those bands depending on your goal. Results are estimates; individual needs vary with metabolic rate, training volume, and health status. Treat the output as a starting point, not a rigid prescription, and adjust based on how your body responds over 2–3 weeks.
In the context of health and fitness, macronutrients are most often defined to be the chemical compounds that humans consume in large quantities that provide bulk energy. Specifically, they refer to carbohydrates, proteins, and fats. Some definitions also include water, air, calcium, sodium, and other substances needed in large quantities. In this calculator, we only calculate daily carbohydrate, protein, and fat needs.
Micronutrients are another essential part of human nutrition and consist of vitamins and dietary minerals such as Vitamin A, copper, iron, and iodine. While macronutrients are necessary daily in amounts on the order of grams, humans typically only need fewer than 100 milligrams of micronutrients each day.
Select your units, fill in age, sex, height, weight, and activity level, choose your goal (lose fat, gain muscle, maintain, or keto), and tap calculate. The result shows your estimated TDEE plus daily gram targets for protein, carbohydrates, and fat, along with the calorie contribution of each. Protein and carbs each yield 4 calories per gram; fat yields 9. If your fat-loss result shows, say, 160g protein / 175g carbs / 55g fat, those numbers are your daily ceiling for each category — hit your protein target first, then fill in carbs and fat around meals you enjoy. If the numbers feel too aggressive, bump calories by 100 and reassess after two weeks.
The calculator first estimates TDEE using the Mifflin-St Jeor BMR equation, then applies an activity multiplier (sedentary 1.2 through very active 1.9). A goal-specific calorie adjustment is applied (e.g., a 500 kcal deficit for fat loss, or a 250–500 kcal surplus for muscle gain). Those adjusted calories are then split into macros:
Protein (g)
(TDEE × protein%) ÷ 4
Carbs (g)
(TDEE × carbs%) ÷ 4
Fat (g)
(TDEE × fat%) ÷ 9
For a 175 lb, moderately active 30-year-old man targeting fat loss, TDEE ≈ 2,600 kcal; after a 500 kcal deficit the target is 2,100 kcal, split roughly 35% protein (184g) / 40% carbs (210g) / 25% fat (58g) — per USDA AMDR guidance.
Proteins are organic compounds comprised of amino acids, and are one of the types of macronutrients. Amino acids are essential to a person's well-being, and there are certain amino acids that can only be obtained through diet. These amino acids are typically referred to as "essential amino acids," and are obtained by humans and other animals through the consumption of protein.
Carbohydrates, often referred to as simply "carbs," are compounds that are typically classified as sugar, starch, or fiber. Sugar is the simplest form of carbohydrate, while starch and fiber are complex carbohydrates. Glucose is a monosaccharide and is one of the key sources of energy for humans.
Too many carbohydrates in the form of sugar (common in processed foods) can have negative health effects, but more complex carbohydrates (from vegetables, fruits, whole grains, legumes, etc.), particularly those that provide dietary fibers, are beneficial and necessary for the human body.
Fats are molecules comprised primarily of carbon and hydrogen atoms. Common examples include cholesterol, phospholipids, and triglycerides. Although fats are typically viewed as unhealthy, they have both structural and metabolic functions and are a necessary part of the human diet. They are also highly energy dense and are the most efficient form of energy storage.
Generally, saturated and trans fats are considered unhealthy fats, while monounsaturated, polyunsaturated, and omega-3 fatty acids are considered to be healthier, better sources of fat for the body.
The biggest thing people get wrong about macros is treating one ratio as universal. Weight loss and muscle gain pull in genuinely different directions. For fat loss, a higher protein percentage — typically 30–35% of calories — is protective: it limits muscle breakdown during a caloric deficit and keeps hunger more manageable because protein is the most satiating macronutrient. Carbohydrates drop to the lower end of their AMDR range (around 40–45%), and fat fills the remainder. For muscle gain, the priority shifts toward total calorie surplus and carbohydrate availability, since carbs are the primary fuel for resistance training and replenish glycogen. Protein stays elevated at 25–30% but carbs climb to 50–55%, with fat in the 15–25% range to keep overall calories in check. The USDA AMDR provides the guardrails; your training volume, recovery, and adherence determine where within those bands you land.
IIFYM — flexible dieting — is the practice of meeting daily macro targets without prescribing specific foods. The premise is that a gram of protein from Greek yogurt is metabolically equivalent to a gram from chicken breast, so adherence improves when people aren't locked into a rigid meal plan. Research on flexible dietary restraint generally supports this: people who track macros without labeling foods as "good" or "bad" tend to maintain their diet longer and show less emotional eating than those using rigid plans. The catch is food quality still matters for micronutrients, fiber, satiety, and long-term health — hitting 175g protein from protein bars alone isn't the same as getting it from a variety of whole foods. IIFYM works best as a structure, not a license to ignore produce and whole grains. Pair macro tracking with a diet built mostly on nutrient-dense foods and you get the flexibility advantages without the nutritional gaps.
Standard AMDR carbohydrate targets (45–65% of calories) are incompatible with a ketogenic diet, which aims to suppress carbohydrates enough — typically under 50g/day, or about 5–10% of a 2,000-calorie diet — to shift the body into fat-burning ketosis. On a keto split, fat climbs to 60–75% of calories and protein holds at 20–30%. The macro calculator's keto preset reflects these targets, but it's worth understanding that the evidence base for long-term ketogenic eating is narrower than for standard balanced diets. The Dietary Guidelines for Americans do not endorse blanket carb restriction at those levels. Keto may be effective for short-term fat loss and is used clinically for epilepsy management, but people with diabetes or metabolic conditions should consult a physician before pursuing carb restriction of that magnitude.
Even a well-calculated macro split needs adjustment over time. As weight drops, TDEE decreases — so the calorie deficit that drove early progress shrinks. A common rule of thumb: reassess your macros every 4–6 weeks, or whenever weight hasn't moved in 10 or more days. The adjustment options are increasing steps or activity (to raise TDEE without eating less), reducing calories by 100–150 per day, adding a structured diet break at maintenance for 1–2 weeks, or cycling between deficit and maintenance phases (sometimes called diet periodization). Muscle-gain phases plateau differently: if strength isn't improving over 3–4 weeks, the surplus is likely too small or sleep and recovery are the limiting factors. A single calculation is a starting point — the real skill is knowing when and how to update the numbers based on actual results.
The math is the same but the inputs differ, and the outputs can be substantially lower. Because women generally have lower body weight, less lean mass, and lower BMR than men of the same height and age, calculated TDEE and therefore macro gram targets are typically smaller. For example, a moderately active 30-year-old woman at 135 lb might calculate a maintenance target around 1,950 kcal compared to about 2,600 for a comparable man — producing protein targets of roughly 120g vs. 160g. The protein RDA of 0.8 g per kilogram of body weight applies to both, but active women, particularly those doing resistance training, benefit from the higher end of the athlete range (1.4–2.0 g/kg) just as men do. Women who are pregnant or breastfeeding have additional protein and calorie needs that go beyond this calculator's scope; those cases warrant guidance from an OB or registered dietitian.
The number of calories a person needs daily is based on height, weight, age, activity level, and whether they want to maintain, lose, or gain weight. The Mifflin-St Jeor Equation calculates BMR based on body weight and height, while the Katch-McArdle Formula takes lean body mass into account.
2,000 – 3,000
calories per day
1,600 – 2,400
calories per day
Reference table showing protein, carbohydrate, and fat content per standard serving size across common food categories.
| Food | Serving Size | Protein | Carbs | Fat |
|---|---|---|---|---|
| Chicken Breast | 4 oz (113g) | 35g | 0g | 4g |
| Salmon (Atlantic) | 4 oz (113g) | 23g | 0g | 15g |
| Eggs (whole) | 2 large | 12g | 1g | 10g |
| Greek Yogurt (nonfat) | 1 cup (227g) | 24g | 9g | 1g |
| Lean Ground Beef (93/7) | 4 oz (113g) | 24g | 0g | 8g |
| Food | Serving Size | Protein | Carbs | Fat |
|---|---|---|---|---|
| Brown Rice (cooked) | 1 cup (195g) | 5g | 45g | 2g |
| Oats (dry) | 1/2 cup (40g) | 5g | 27g | 3g |
| Sweet Potato | 1 medium (130g) | 2g | 26g | 0g |
| Whole Wheat Bread | 2 slices | 8g | 28g | 2g |
| Banana | 1 medium (118g) | 1g | 27g | 0g |
| Food | Serving Size | Protein | Carbs | Fat |
|---|---|---|---|---|
| Avocado | 1/2 medium (68g) | 1g | 6g | 11g |
| Almonds | 1 oz (28g) | 6g | 6g | 14g |
| Olive Oil | 1 tbsp (15ml) | 0g | 0g | 14g |
| Peanut Butter | 2 tbsp (32g) | 8g | 6g | 16g |
| Chia Seeds | 1 oz (28g) | 5g | 12g | 9g |
Your calculated macro split hinges on TDEE accuracy, which in turn depends on how honestly you assess activity level. Most people overestimate activity and end up eating more than they burn — which is why "lightly active" is the conservative choice for anyone with a desk job and 3–4 workouts per week. Beyond TDEE, goal selection matters most: choosing muscle gain when you're actually at a high body-fat percentage means a surplus that adds more fat than muscle. Body weight determines the scale of all three macro numbers — heavier individuals have larger absolute gram targets even at identical percentages. Age and sex shift baseline BMR. And training type matters: endurance athletes prioritize carbs differently than powerlifters, and if your training schedule is periodized (heavy weeks followed by lighter weeks), a single static macro split will be suboptimal for at least part of the cycle.
Priya is a 28-year-old in Austin, Texas. She's 5'4", 155 lb, moderately active (desk job, 4 gym sessions per week), and wants to lose fat. Her BMR (Mifflin-St Jeor) ≈ 1,509 kcal. With a 1.55 activity multiplier, TDEE ≈ 2,339 kcal. With a 400-calorie deficit, she targets 1,939 kcal. At a 33/42/25 protein/carb/fat split: Protein 160g / Carbs 204g / Fat 54g. Her protein target is 2.3 g/kg — well within the athletic range recommended for body recomposition.
Jordan is a 21-year-old in Columbus, Ohio — 6'0", 175 lb, very active (daily training, strength sport). BMR ≈ 1,947 kcal; TDEE with 1.725 multiplier ≈ 3,358 kcal. With a 300-calorie lean-bulk surplus, he targets 3,658 kcal. At a 25/50/25 split: Protein 229g / Carbs 457g / Fat 102g. The high carb allocation fuels two-a-days and supports glycogen recovery — exactly why the AMDR puts carbs at up to 65% of calories for high-output athletes.
Hit your protein target first at every meal — it's the hardest to reach and the most important for muscle and satiety.
Reassess your TDEE and macros every 4–6 weeks, especially during active weight loss, because TDEE falls as body weight decreases.
Don't obsess over hitting exact gram targets daily; hitting a weekly average within 5–10% is enough for consistent results.
If tracking every meal feels overwhelming, start by only tracking protein for two weeks — it builds the habit and usually tightens carb and fat intake automatically.
For keto macros, track net carbs (total carbs minus fiber) rather than total carbs to stay under the threshold while still eating fibrous vegetables.
Round your macro numbers to the nearest 5 grams and use consistent portion tools (a kitchen scale beats measuring cups for accuracy) so the numbers you log match what you actually ate.
15-30 minutes of elevated heart rate activity
45-120 minutes of elevated heart rate activity
2+ hours of elevated heart rate activity
A higher-protein split — roughly 30–35% protein, 40–45% carbs, 25–30% fat — is well supported for fat loss because protein preserves lean mass during a deficit and reduces hunger. The exact percentages matter less than hitting a consistent daily protein gram target based on your body weight, per USDA AMDR guidance.
The baseline RDA is 0.8 g per kilogram of body weight, but that covers sedentary adults. Anyone exercising regularly benefits from 1.2–2.0 g/kg, with the higher end for strength athletes or people in a caloric deficit trying to retain muscle.
Macronutrients — protein, carbohydrates, and fat — are the three categories that provide calories. Protein and carbs each contain 4 calories per gram; fat contains 9 calories per gram. Everything you eat that has calories contains some combination of these three.
No. Optimal ratios vary with body composition, training type, food preferences, and metabolic response. A sedentary person and a competitive cyclist both targeting fat loss need different carbohydrate allocations. The calculator provides a science-based starting point; personal adjustments based on 2–4 weeks of results matter more than any fixed formula.
A calorie calculator gives you a total daily energy target. A macro calculator takes that calorie number and breaks it into specific gram targets for protein, carbs, and fat — making it actionable when you're logging food.
Yes — select the keto goal preset, which sets carbs to approximately 5–10% of calories (under 50g/day), fat to 65–75%, and protein to 20–25%. Because this diverges significantly from standard USDA AMDR ranges, review the keto section above and consult a healthcare provider if you have diabetes or metabolic conditions.
Every 4–6 weeks, or whenever body weight has stalled for 10 or more consecutive days. As weight changes, TDEE changes, and your targets should follow.
The percentage splits are similar, but absolute gram targets are typically lower for women because of lower average body weight and BMR. Active women should still aim for 1.2–2.0 g/kg protein, just as men do.
Brief disclaimer: This calculator provides educational macro estimates based on the Mifflin-St Jeor equation and USDA AMDR ranges. Individual macronutrient needs vary with metabolic rate, training volume, medical conditions, and personal response. Results are a starting point, not a clinical prescription. Consult a registered dietitian or healthcare provider before making significant dietary changes, especially if you have diabetes, metabolic conditions, or are pregnant or breastfeeding.