Macro Calculator — Protein, Carbs & Fat Targets
Calculate your optimal macronutrient breakdown (protein, carbohydrates, and fat) based on your calorie goal and fitness objective.
Understanding Macronutrients
Macronutrients are the three nutrients that provide caloric energy: protein (4 cal/g), carbohydrates (4 cal/g), and fat (9 cal/g). While total calorie balance determines whether you gain or lose weight, the ratio of macros significantly affects body composition, performance, hunger, and long-term adherence.
Macro Splits by Goal
| Goal | Protein | Carbs | Fat |
|---|---|---|---|
| Weight Loss | 30–40% | 30–40% | 20–30% |
| Maintenance | 25–35% | 35–45% | 25–35% |
| Muscle Gain | 25–35% | 40–50% | 20–30% |
| Keto / Low-Carb | 20–25% | 5–10% | 65–75% |
| Athletic Performance | 20–25% | 50–60% | 20–30% |
The Primacy of Protein
Protein is the most important macro to get right. It's the building block of muscle tissue, contributes significantly to satiety (reducing hunger), has the highest thermic effect of food (20–30% of protein calories are burned in digestion), and helps preserve lean mass during a calorie deficit. Most evidence supports a minimum of 0.7–1g per pound of body weight for people engaged in regular resistance training.
Carbohydrates: Performance Fuel
Carbohydrates are the body's preferred fuel source for high-intensity exercise and the brain's primary energy source. Reducing carbs doesn't make fat burn faster at the same calorie level — but lower-carb diets can help some individuals control appetite and reduce insulin spikes, making adherence easier.
Fat: Essential for Hormones and Nutrients
Dietary fat is essential for absorbing fat-soluble vitamins (A, D, E, K), producing hormones (including testosterone and estrogen), protecting organs, and maintaining cell membrane integrity. Dropping fat below ~15% of calories can impair hormonal health. Focus on quality sources: olive oil, avocado, nuts, and fatty fish.