Macro Calculator
Get your ideal daily protein, carbs, and fat targets based on your calorie goal and diet preference.
How to use this calculator
Enter your stats using the sliders, select your activity level and diet goal. The calculator auto-calculates your calories and breaks them into macros. Or enter a specific calorie target directly at the bottom to override the auto-calculation. Adjust meals per day to get a per-meal breakdown.
Understanding your macros
Macronutrients are the three calorie sources: protein (4 cal/g), carbohydrates (4 cal/g), and fat (9 cal/g). Protein is the most important for body composition — it preserves muscle while cutting and builds muscle while bulking. Carbs fuel performance and training. Fat supports hormones and satiety. The splits shown are evidence-based starting points, not rigid rules.
Frequently asked questions
Macro ratios by diet goal
There is no single "best" macro split — the right ratio depends on your goal, preferences, and response to different fuel sources. The table below reflects common evidence-based starting points used by nutrition researchers and coaches.
| Goal | Protein | Carbohydrates | Fat |
|---|---|---|---|
| Weight loss (standard) | 30–35% | 35–45% | 25–35% |
| Weight loss (high protein) | 35–40% | 30–40% | 20–30% |
| Muscle building | 25–30% | 45–55% | 20–30% |
| Athletic performance | 20–25% | 50–60% | 20–30% |
| Ketogenic (very low carb) | 25–35% | 5–10% | 60–75% |
| Maintenance (general health) | 20–30% | 40–50% | 25–35% |
What each macronutrient does
Each macronutrient plays a distinct role in body function. Protein is the only macro used for muscle repair and growth. Carbohydrates are the preferred fuel for the brain and high-intensity exercise. Fat is essential for hormone production, vitamin absorption, and cell membrane structure.
| Macro | Calories per gram | Primary role | Minimum recommended |
|---|---|---|---|
| Protein | 4 cal/g | Muscle repair, enzymes, immune function | 0.6g/lb bodyweight |
| Carbohydrates | 4 cal/g | Brain fuel, glycogen storage, exercise performance | No strict minimum, but ~100g/day for brain function |
| Fat | 9 cal/g | Hormones, fat-soluble vitamins (A, D, E, K), satiety | 0.3g/lb bodyweight |
| Fiber | ~2 cal/g | Gut health, satiety, blood sugar regulation | 25–35g/day |
| Alcohol | 7 cal/g | No essential function; impairs protein synthesis | Minimize |
How to hit your macros — practical tips
- ·Prioritize protein first — it's the hardest macro to hit and the most important for body composition
- ·Build meals around a protein source (chicken, fish, eggs, tofu, Greek yogurt) before adding carbs and fat
- ·Whole food carbs (rice, oats, sweet potato, fruit) are more filling and nutritious than refined carbs at the same calorie count
- ·Healthy fats (avocado, olive oil, nuts, fatty fish) support satiety and are easy to add to meals
- ·Tracking macros for 4–8 weeks builds long-term portion awareness, even if you stop tracking afterward
- ·Apps like Cronometer, MyFitnessPal, and MacroFactor make daily tracking practical and fast
- ·You don't need to hit targets exactly every day — averages over 3–5 days matter more than perfection on any single day
Flexible dieting (IIFYM) vs. clean eating
IIFYM (If It Fits Your Macros) is the evidence-based approach that any food can fit a healthy diet as long as total macros and calories are controlled. Research consistently shows that calorie and protein intake — not food "cleanliness" — determine body composition outcomes. Clean eating has the advantage of naturally providing more micronutrients, fiber, and satiety per calorie. In practice, the most effective approach combines both: a mostly whole-food diet with room for flexibility to maintain adherence.