Macro Calculator
Enter your body stats and goal to get your daily protein, carbohydrate, and fat targets in grams. Backed by current research on macronutrient requirements for fat loss, muscle gain, and performance.
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Enter your values above to see the results.
Tips & Notes
- ✓Set protein first and non-negotiably — then distribute remaining calories between carbs and fat according to your preference. Protein is the variable most people undereat.
- ✓Fat below 20% of calories impairs hormone production. Even on the most aggressive cut, maintain at least 0.5–0.8 g of fat per kg of body weight.
- ✓Carbohydrates are not essential in the strict dietary sense, but they significantly improve performance in any training above moderate intensity. Low carb reduces strength output, sprint capacity, and training volume.
- ✓Use plant proteins at 110–115% of the animal protein target to compensate for lower leucine content and digestibility of most plant protein sources.
- ✓Weekly macro totals matter more than daily perfection. A day at 20% above protein target followed by a day at 20% below averages to the right number — rigid daily tracking is not necessary for results.
Common Mistakes
- ✗Setting the carb percentage first and letting protein fall wherever it lands — protein is the priority macro for body composition and should always be set before allocating carbs and fat.
- ✗Dropping fat below 20% of calories during aggressive cuts, which suppresses testosterone and estrogen, reduces absorption of fat-soluble vitamins A, D, E, and K, and impairs long-term adherence.
- ✗Counting protein from all sources equally — plant proteins have lower leucine content and digestibility, so 30 g of protein from lentils produces less muscle protein synthesis stimulus than 30 g from whey or chicken.
- ✗Treating macro percentages as more important than absolute gram targets — whether protein is 30% or 35% of calories matters far less than hitting 150 g of protein per day in absolute terms.
- ✗Using total body weight to calculate protein for significantly overweight individuals — for people with BMI above 35, using ideal body weight or lean body mass as the basis for protein calculation gives a more appropriate target.
Macro Calculator Overview
Macros are the second layer of nutrition planning — after total calories, macro composition determines body composition outcomes. Hitting your calorie target with the wrong macro split can mean losing muscle during a cut or adding mostly fat during a bulk.
Total daily calories from Mifflin-St Jeor + activity:
Caloric value of each macronutrient: Protein: 4 kcal per gram Carbohydrates: 4 kcal per gram Fat: 9 kcal per gram Protein target drives the split — set protein first, then divide remaining calories between carbs and fat. Protein (g) = body weight (kg) × rate (g/kg) | Remaining kcal = total − (protein g × 4)
EX: Male, 78 kg, fat loss goal, 2,000 kcal daily target Step 1 — Protein: 78 × 2.0 g/kg = 156 g protein → 156 × 4 = 624 kcal from protein Step 2 — Remaining: 2,000 − 624 = 1,376 kcal for carbs and fat Step 3 — Fat minimum: 78 × 0.8 g/kg = 62 g fat → 62 × 9 = 558 kcal Step 4 — Carbs: 1,376 − 558 = 818 kcal ÷ 4 = 204 g carbs Final split: 156 g protein / 204 g carbs / 62 g fat (31% / 41% / 28% of calories)
Macro gram targets from percentage splits:
Evidence-based protein targets by goal (per kg of total body weight): Fat loss: 2.0–2.4 g/kg (higher end preserves more muscle during aggressive cuts) Muscle gain: 1.6–2.2 g/kg (upper end for beginners and naturals; diminishing returns above 2.2) Maintenance: 1.4–1.8 g/kg (adequate for most active adults) Endurance performance: 1.4–1.7 g/kg (carbohydrate availability matters more) Older adults (55+): 1.6–2.0 g/kg (higher needs due to reduced anabolic sensitivity)
EX: Female, 62 kg, muscle building goal Protein: 62 × 1.8 g/kg = 112 g → costs 448 kcal At TDEE + 250 kcal surplus (say 2,200 kcal total): Remaining after protein: 2,200 − 448 = 1,752 kcal Fat at 0.8 g/kg: 62 × 0.8 = 50 g → 450 kcal Carbs: (1,752 − 450) ÷ 4 = 325 g Split: 112 g protein / 325 g carbs / 50 g fat — carb-forward supports training performance.
Macro ratio recommendations by goal:
| Goal | Protein (g/kg) | Carbs (% calories) | Fat (% calories) |
|---|---|---|---|
| Fat loss (aggressive) | 2.0–2.4 | 25–35% | 20–30% |
| Fat loss (moderate) | 1.8–2.2 | 30–40% | 25–30% |
| Maintenance | 1.4–1.8 | 40–50% | 25–35% |
| Lean bulk | 1.6–2.0 | 45–55% | 20–30% |
| Endurance performance | 1.4–1.7 | 55–65% | 20–25% |
| Ketogenic (low carb) | 1.6–2.0 | 5–10% | 65–75% |
Practical macro distribution — daily meal breakdown:
| Protein source | Protein per 100g | Leucine content | Digestion speed |
|---|---|---|---|
| Chicken breast (cooked) | 31 g | High | Moderate |
| Whey protein concentrate | 75–80 g | Very high | Fast |
| Eggs (whole) | 13 g | High | Moderate |
| Greek yogurt (0% fat) | 10 g | Moderate-high | Moderate-slow |
| Tofu (firm) | 17 g | Moderate | Moderate |
| Lentils (cooked) | 9 g | Low-moderate | Slow |
Fat intake below 20% of total calories consistently suppresses testosterone and estrogen production — hormones critical for muscle retention, libido, immune function, and mood. Do not reduce fat below approximately 0.5 g per kg of body weight regardless of how aggressive a calorie cut you are running. Within the constraints of your calorie target and minimum fat requirement, the protein-carb-fat split is surprisingly flexible — adherence to your total calorie and protein targets matters far more than hitting precise percentages for the other two macros.
Frequently Asked Questions
Research from multiple meta-analyses converges on a range of 1.6–2.2 g of protein per kg of body weight per day for maximizing muscle protein synthesis in resistance-trained adults. The landmark 2018 Morton et al. meta-analysis found that protein intakes above 1.62 g/kg produced no additional muscle gains on average, though individual variation exists. During a calorie deficit, the recommendation rises to 2.0–2.4 g/kg because higher protein is needed to protect existing muscle when calories are restricted. For beginners with no training history, lower intakes (1.4–1.6 g/kg) may be sufficient during initial rapid adaptation, but there is no downside to meeting the higher target.
For total fat loss over equivalent time periods with equal calories and protein, research consistently shows no meaningful difference between low-carb and low-fat approaches. The 2018 DIETFITS trial compared carefully controlled low-carb and low-fat diets for 12 months and found nearly identical fat loss outcomes. The better approach is whichever you can sustain. Practical considerations: low-carb diets suppress appetite effectively for many people and simplify food choices; higher-carb approaches better support strength training performance and are often easier to maintain socially. Athletes prioritizing performance should lean toward higher carb intakes.
Fat intake below approximately 20% of total calories consistently suppresses production of steroid hormones — testosterone in men and estrogen in women — which are essential not just for reproductive function but for muscle retention, bone density, immune function, and mood regulation. Fat is also required for absorption of vitamins A, D, E, and K; severe fat restriction causes deficiencies in these nutrients even if dietary intake is adequate. Additionally, fat-soluble compounds in food (including omega-3 fatty acids critical for cardiovascular and brain health) cannot be absorbed without adequate dietary fat present. The minimum safe fat intake for most adults is approximately 0.5–0.8 g per kg of body weight.
Daily precise tracking is not necessary for good results — weekly averages matter more than daily perfection. Research on flexible dieting versus rigid tracking shows similar body composition outcomes when weekly averages are consistent, with flexible approaches typically showing better long-term adherence. The most important variable to track consistently is protein — hitting your protein target most days prevents muscle loss during a cut and supports muscle growth during a bulk. Carbs and fats can flex more freely around total calorie targets without significantly affecting outcomes. Many experienced athletes track macros carefully only during initial learning phases, then maintain habits without daily logging.
Carb cycling — eating more carbohydrates on training days and fewer on rest days — is a legitimate approach that can optimize performance and body composition simultaneously. On training days, higher carbohydrate intake fuels the session and replenishes glycogen afterward. On rest days, lower carbs with the same protein and slightly higher fat supports fat oxidation when muscles are resting. However, research shows the body composition advantage over simply hitting consistent daily averages is modest — carb cycling is most beneficial for competitive athletes and people who enjoy the structure. For most people, consistent daily macro targets that average out to appropriate weekly totals produce equivalent results with less mental overhead.
The fundamental macro principles apply similarly to both sexes, but several differences are worth noting. Women typically have higher essential fat requirements (10–13% body fat vs 3–5% for men), which means fat loss targets should not aim for the same absolute body fat levels. Women tend to use more fat relative to carbohydrate during low-intensity exercise due to hormonal differences, which may support slightly higher fat intakes for endurance athletes. Protein recommendations are the same per kilogram of body weight. Hormonal fluctuations during the menstrual cycle affect calorie needs by approximately 100–300 kcal in the luteal phase (second half), which can be addressed by slightly increasing calories or carbohydrates during that period rather than fighting natural appetite increases.