Get personalized daily targets for protein, carbs, and fat based on your stats and goal. Whether you are cutting, bulking, or maintaining — the numbers start here.
Protein first: 0.7–1.0g per pound of bodyweight for active people. Then split remaining calories between carbs and fat based on your goal — more carbs for performance and muscle gain, more fat for keto or appetite control. Hit protein daily; carbs and fat are flexible within ±10g.
Written by Ash K · Last updated: May 2026 · Sources cited below
Macros — protein, carbohydrates, and fat — are the three nutrients your body needs in large amounts. The ratio you eat them in affects body composition, energy, and performance more than total calories alone.
This calculator gives you personalized daily targets in grams based on your stats, activity level, and goal. Whether you're calculating macros for weight loss, muscle gain, or maintenance, the process starts here.
What Makes Up Your Daily Calorie Burn (TDEE)
Your body runs on three fuel sources. Each one serves a different function, and getting the balance right determines whether you lose fat while keeping muscle, build muscle without excess fat, or maintain where you are.
Protein (4 calories per gram) builds and repairs muscle, creates enzymes and hormones, and keeps you full longer than carbs or fat. It also has the highest thermic effect — your body burns 20–30% of protein calories just digesting it. This is why high-protein diets consistently outperform low-protein diets for fat loss in research.
Key Takeaway: Protein is the most important macro to hit accurately. It directly determines how much muscle you retain during fat loss and how much you build during a surplus. Carbs and fat are flexible — protein is not. Target 0.7–1.0g per pound of body weight as a starting point for active people.
Carbohydrates (4 calories per gram) are your body's preferred fuel for high-intensity activity. Your brain runs primarily on glucose. Your muscles store carbs as glycogen for workouts. Complex carbs (whole grains, vegetables, legumes) provide sustained energy; simple carbs (sugar, refined flour) spike and crash.
Fat (9 calories per gram) supports hormone production (including testosterone and estrogen), absorbs fat-soluble vitamins (A, D, E, K), builds cell membranes, and protects brain health. The decades-old fear of dietary fat has been thoroughly debunked — fat is essential, not harmful.
Enter your age, sex, height, weight, and activity level. Select your goal — fat loss, maintenance, or muscle gain. Choose a diet approach — balanced, high-protein, keto, or low-carb.
The calculator uses the Mifflin-St Jeor equation to estimate your TDEE, then applies your goal modifier and macro split. If you've already calculated your TDEE using our TDEE Calculator, you can enter it directly.
Your results show three things:
Daily calories for your goal. Macro targets in grams (protein, carbs, fat). Macro targets as percentages of total calories.
Tip: Use the gram amounts, not the percentages, as your daily tracking target. Grams are absolute; percentages shift if your calories change. Hit your protein target first every day — that's the anchor. Distribute remaining calories between carbs and fat based on what makes you feel best.
Popular Macro Splits by Goal
These are evidence-based starting points, not rigid rules. Adjust based on your energy, performance, and results over 4–6 weeks.
| Goal | Protein | Carbs | Fat | When to use |
|---|---|---|---|---|
| Fat loss (balanced) | 30% | 40% | 30% | Sustainable cutting with flexibility |
| Fat loss (high-protein) | 40% | 30% | 30% | Preserving muscle during aggressive deficit |
| Muscle gain | 30% | 45% | 25% | Maximizing performance and recovery |
| Maintenance | 25% | 50% | 25% | General health, weight stability |
| Keto | 25% | 5% | 70% | Appetite control, ketone-based metabolism |
| Low-carb | 30% | 25% | 45% | Preference or reduced carb tolerance |
Why the fat loss split is higher protein: In a calorie deficit, your body preferentially breaks down muscle for energy — unless protein intake is high enough to signal that muscle is still needed. Research by Helms et al. (2014) found that protein at 2.3–3.1 g/kg of lean body mass during a deficit significantly reduces muscle loss compared to lower intakes.
Note: The "best" macro ratio is whichever one you can sustain. A 30/40/30 split followed consistently beats a "perfect" 40/30/30 split followed erratically. Research consistently shows that adherence — not exact ratios — predicts long-term results (Hall & Guo, 2017).
How Much Protein You Actually Need (by Goal)
This is the most-debated macro question, but the research is clearer than the debate suggests.
Sedentary adults: 0.8 g/kg body weight per day (the RDA). This is the minimum to prevent deficiency — not the optimum for body composition.
Active adults doing resistance training: 1.6–2.2 g/kg body weight per day. A 2018 meta-analysis by Morton et al. in the British Journal of Sports Medicine found this range maximizes muscle protein synthesis.
During calorie deficit (cutting): 2.0–2.4 g/kg. Higher protein during a deficit is critical because your body's tendency to break down muscle for energy is strongest when calories are restricted.
Practical example: You weigh 80 kg (176 lbs), train 4 days/week, and are in a calorie deficit. Target: 160–192g protein daily. That's roughly: chicken breast at lunch (35g) + Greek yogurt (17g) + three eggs (18g) + salmon at dinner (25g) + protein shake (25g) + protein from grains and vegetables (~20g) = 140g before trying hard. Add a can of tuna or extra serving of cottage cheese and you're at target.
Warning: Very low-carb diets (below 50g per day) can impair high-intensity exercise performance. If you do CrossFit, HIIT, heavy compound lifts, or sports, keep carbs at a minimum of 30% unless you're specifically doing keto and have adapted over several weeks. Cutting carbs too aggressively is the most common macro mistake for active people.
For a detailed protein calculation, our Protein Intake Calculator gives you a number tailored to your specific weight, body fat percentage, and training intensity.
Four Common Macro Mistakes That Sabotage Results
Mistake 1: Obsessing over exact ratios while ignoring calories.
Calories drive weight change. Macros determine the composition of that change (muscle vs. fat). If you're hitting 35/40/25 perfectly but eating 500 calories over your TDEE, you're gaining weight regardless of the ratio. Get calories right first, then optimize macros.
Mistake 2: Fear of dietary fat.
Cutting fat below 20% of calories for extended periods disrupts hormone production — testosterone, estrogen, and cortisol all require dietary fat as a building block. Include fat sources you enjoy (olive oil, nuts, avocado, fatty fish) at 20–35% of calories.
Mistake 3: Cutting carbs without a reason.
Keto works well for some people. But "low-carb for everyone" is dogma, not science. If you strength train, aggressive carb restriction reduces workout performance, slows recovery, and increases muscle loss during dieting. Unless you have a specific medical reason or strong personal preference, keep carbs at 30%+ for performance.
Mistake 4: Never recalculating.
Lose 10–15 lbs and your TDEE drops. Your macro targets from day one no longer match your current body. Recalculate every 10–15 lbs of weight change, or every 6–8 weeks during active dieting. Use the calculator again — it takes 30 seconds.
Tip: You don't need to track macros forever. Track strictly for 2–3 weeks to learn portion sizes and the macro content of foods you eat regularly. Then transition to estimated tracking — hitting your protein target daily and eyeballing carbs and fat. The goal is knowledge, not permanent logging.
Protein Per Serving — Common Sources
Once you have your macro targets, implementation is straightforward.
Enter your daily protein, carbs, and fat targets into a tracking app — MyFitnessPal, Cronometer, or MacroFactor all work. Log everything for the first 2–3 weeks to build awareness.
Priority order each day:
Being within 5–10g on carbs and fat is perfectly fine. Macro tracking is a direction, not a destination that requires decimal-point precision.
When to adjust: Track your weight weekly (same time, same conditions). Take progress photos monthly. Monitor energy, workout performance, and hunger daily. If weight isn't moving after 4–6 weeks in a deficit, reduce calories by 100–150. If you're gaining fat too fast in a surplus, reduce by 100–150.
Bottom Line: Protein first (0.7–1.0g per lb bodyweight for active people), then split remaining calories between carbs and fat based on your activity level and preference. Consistency beats precision. A macro plan you follow 80% of the time produces far better results than a "perfect" plan you follow 50% of the time.
What is the best macro ratio for weight loss?
Research shows that calorie deficit + adequate protein is what matters — exact carb/fat ratios are secondary. A 30/40/30 (protein/carbs/fat) split is a solid starting point for most people cutting weight. Increase protein to 35–40% if you're in an aggressive deficit and want to minimize muscle loss.
How do I calculate macros for muscle gain?
Use this calculator with a 300–500 calorie surplus above your TDEE. Set protein at 30% (1.6–2.2 g/kg), carbs at 40–50% (to fuel workouts and recovery), and fat at 20–30%. Carbs matter more during a bulk than during a cut because they directly fuel training performance and glycogen recovery.
What are the best macros for cutting?
During a cut, prioritize protein at 35–40% of calories (2.0–2.4 g/kg bodyweight) to preserve muscle. Keep fat at minimum 20% for hormonal health. Fill remaining calories with carbs. The more aggressive your deficit, the higher your protein percentage should be.
Should I track macros or just calories?
Tracking macros is more useful because hitting your protein target has specific benefits (muscle retention, satiety) that pure calorie counting can't ensure. That said, if detailed tracking causes stress, focus on protein grams + total calories — that captures 80% of the benefit with half the effort.
How much protein do I need per day?
For sedentary adults: minimum 0.8 g/kg. For active people strength training: 1.6–2.2 g/kg. For active people in a calorie deficit: 2.0–2.4 g/kg. Use our Protein Intake Calculator for a number tailored to your exact situation.
Do macros matter if I'm already in a calorie deficit?
Calories drive weight loss. Macros determine whether you lose fat or muscle. In a deficit with low protein, you lose both. In a deficit with high protein and resistance training, you lose primarily fat while preserving muscle. Macros don't override calories, but they determine the quality of your results.
This tool is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider with questions about your health.